Author: Mark Valderrama

After 25+ years keeping bettas, I can tell you that gill flaring is one of the most misunderstood behaviors in the hobby. New keepers often panic when they see it, assuming their fish is stressed or sick. But flaring is actually your betta’s primary communication tool. it can signal territory defense, a stress response, or even just a reaction to seeing its own reflection in the glass. I’ve covered this exact topic in a dedicated video, and in this guide I’ll walk you through the six main reasons bettas flare so you know exactly when to intervene and when to relax.

Why Do Betta Fish Flare Gills?

In the wild, some animals express their rage or violence in distinctive yet potent ways. They frequently engage in it to avoid intrusion or protect themselves from predators. (Video source).

When their control over their established areas is in danger, Betta Fish flare their fins.

This behavior is also possible when they need to defend their mating partners or when they catch a glimpse of themselves in the mirror.

Fortunately, this aggressive behavior is confined to brief flares and fin spreads. So, there is no need for concern.

But first, let’s examine their actions in greater depth so that you can comprehend them. Additionally, it will aid in preventing excessive flare-ups

1. Signaling Aggression

When they see another fish that they believe could invade their region, bettas are known to respond violently.

They may also be hostile to other fish simply because they don’t like the way their tank mate looks.

And Betta flares its gills to show its rage or fury. This is a basic trait that enables them to protect their area against intruders.

2. Showing Dominance

Comparatively speaking to their female counterparts, male Bettas are rather territorial. In their natural environment, male Betta fish may flare their gills and fins to display hostility if another fish wanders into their channel.

In order to protect its area from any potential threats, it does this.

Their gills flare, making them appear larger and more menacing. The adversary often caves and alters its strategy as a consequence. This behavior aids in preventing physical harm to other members of the species.

But problems might go worse if the space is tiny. Because of this, you should take special care not to house two male Bettas together in a tiny or constrained space when you first bring them home.

Give each fish ample room to establish its own territories, or keep only one male Betta in the entire tank.

Without a way out, the two male betta will end up fighting until one of them dies.

3. Protecting the nest

In order to safeguard their eggs and fry after the fish tank’s spawning season is over, Betta fish create bubble nests out of saliva and air.

It’s rather typical for certain fish animals to assault their rivals’ nests. Additionally, some fish species have distinctive strategies to frighten off visitors.

When it comes to asserting their supremacy, betta fish are already very aggressive and show territorial aggression. They will never put up with even the smallest suggestion of having their nests destroyed. They also flare their gills to defend their territories.

Bettas often don’t flare up when they see smaller animals like snails. But in the event of a threat, they may also scare them away by acting like Bettas.

So make sure you get a limited number of bettas when it’s time for them to spawn.

Author’s Note: Bettas release a chemical into the water as a warning sign for other bettas to stay away from them. This helps with avoiding serious outbreaks. But I still recommend providing your betta fish with separate spawning sites within the tank. You can make different hiding spots in their tank using plants.

4. Flaring At Reflection

Finding your fish flaring at nothing might stress you out or even make you laugh. But oddly enough, your Betta buddy finds it challenging to differentiate its own reflection from another fish.

Seeing their own reflection makes Betta males aggressive. For the most part, they mistake it for another fish in the same tank. And as an act of defense, they flare their gills and fins.

Finding Betta’s flaring fins is natural. But if it happens too often, Betta fish can end up getting distressed.

5. A New Environment

Any type of fish can become distressed by a change in their habitat. And Bettas’ situation is the same.

Fish have a difficult time adjusting to different environments after they grow accustomed to one type of habitat. They consequently exhibit hostility.

Some animals have a tendency to grow timid and stop feeding altogether until they feel more at ease.

Betta fish are acutely aware of any changes in their surroundings. Additionally, they could act aggressively since they’re new to the tank and aren’t comfortable with the surroundings.

A little time will help your pet acclimate. An accurate grasp of the environment might need a few days or perhaps a week.

6. Unfamiliarity With The Owner

Betta fish have different perspectives from humans. While humans can distinguish items with more precision, Bettas just use shapes and colors to detect the presence of their owners and other nearby objects.

When you move around the room or close to their tank to feed them or check on them, they experience vibrations as well. To your new Betta pet, you are only a powerful predator attempting to ingest them.

Bettas are able to distinguish colors visually, making it simpler for them to identify a male Betta.

However, they are unfamiliar with you because you are new to their neighborhood. In this situation, they will behave violently and protect themselves as is only normal.

It doesn’t imply that they hate their owners or that betta fish are aggressive by nature. They only use it as a means of projecting fear onto any potential environmental threat they perceive to exist.

How To Make Them Comfortable?

It’s simple and easy to make your Betta comfy. Only when they are startled by their surroundings do they get angry.

You won’t often see Bettas displaying their gills and fins at you after they are used to their owners and there is nothing nearby that can disrupt their serenity.

1. Don’t Make Too Much Noise

Reduced noise is one strategy for reducing their stress. Bettas are sensitive to strong vibrations, which might cause them to activate their defense mode.

By reducing the noise surrounding them, you can prevent continuous flaring.

Make sure you don’t provoke their hostility too frequently since it is really unhealthy for your pet’s immune system. They will be more susceptible to diseases due to a compromised immune system.

Additionally, avoid taking them out every time you clean the Betta tank to let them become acclimated to your presence.

Be cautious while moving the gravel vacuum around the fish if you’re using one. Additionally, while cleaning the water in the tank, use a cup or another item that you generally use to clean water gently.

I advise against often removing the Siamese fighting fish from the aquarium, particularly when they are young.

2. Give Them Time To Adjust

How would you feel or act if you were in a strange place, surrounded by unfamiliar people, in a setting you had never experienced?

Your response might not be the same as a Betta fish. However, even a person would find it difficult to handle the terrible scenario.

Betta flare as a reaction to the novel setting. The hostility should stop once the Betta fish has thoroughly surveyed the aquarium. How you act will also affect how quickly your fish adjusts to its new environment.

Giving them some time to acclimate is, therefore, preferable to giving up on your fish.

3. Cover The Back Of The Tank

In order to reduce the likelihood of potential aggression, block their reflection with a background.

Backgrounds will keep them from seeing their reflections all the time. Consider a background or a lit background that will either provide more intrigue for your fish or prevent them from seeing themselves.

4. Get A Spacious Tank With Plenty Of Hiding Spaces

Long-term success depends on you giving Betta fish lots of places to hide. When your pet is young, it has no idea where to hide from you or its bothersome tank mates.

Once Betta fish are comfortable in their new environment, they can spend as much time as they like hiding from you and their tank mates by using the hideouts.

To create perfect hiding places for your Betta fish, you may use various plants, pebbles, and other decorations.

They will now retreat into hiding rather than flaring excessively, which is advantageous for you, your Betta fish, and their tank companions.

Do Female Bettas Flare?

You would assume that only male Betta fish flare their gills as a natural reaction to danger given the males’ aggressive attitude. The fact is that women are not as aggressive as men. But they can also flare to express hostility or disgust.

Typically, females lash out at one another. Female fish may or may not act in a domineering or territorial manner, in contrast to males who usually do.

They are semi-aggressive, therefore their hostility doesn’t come over as strongly as a guy would.

It’s also quite uncommon for females to flare at their own mirror. They concentrate on exploring their surroundings as a means to receive the activity and excitement they need rather than engaging in combat with the seeming adversary.

By putting a mirror next to the tank, you can assess their level of hostility. It will make it easier for you to keep an eye on the female’s aggression’s frequency and level.

Additionally, consider giving female bettas a variety of places to hide so they may do so during times of adversity.

Additionally, female betta fish flare their fins to deter males when they notice them.

For female bettas, leading a stress-free life is just as important. The female Betta fish’s immune system is highly likely to get compromised if she flares excessively. In order to set up a large tank with lots of hiding places, I advise purchasing an equal number of males and female bettas.

Benefits Of Behavior

It’s not always awful or bad for the fish when flares are used. Even though flaring on occasion might be beneficial, flaring frequently is a symptom of discomfort. I’m going to highlight a few advantages of Betta flaring.

1. A way to make things interesting

In general, bettas are highly clever. Whether it’s eating food, interacting with their owners, or getting along with other fish in their tank, it’s simple for them to become bored with their routine.

A mirror can be held up to the fish or placed in their direction to prevent boredom. Watch to see whether the fish see their own reflection. Your fish will immediately puff up their gills and fins to defend their territory from their apparent opponent as soon as they notice it.

It’s sufficient to perform this task once every week for up to two minutes. By doing this, you’ll be able to mimic their usual behavior without putting them in any risk.

2. Helps with attracting potential mates

In their native habitat, male Bettas flare to entice the female betta fish. In captivity, they consistently follow the same pattern of attraction. Usually entertaining to see is the rivalry among the males to see who is larger and more intimidating.

3. Makes it easy to get rid of stress

Stress is a genuine problem for bettas. They will flare their gills and fins to let some of the tension out if they encounter anything upsetting nearby.

Bettas have a high level of excitement. To maintain their composure, they flare their fins and gills. A hormone called cortisol is released into their systems as a result of the unexpected excitation.

This stress hormone, if present in the body for an extended period of time and in excessive quantities, might harm the health of your fish.

Their gills and fins will naturally flare as a means of releasing it.

4. Stretches their muscles and fins

Do you know how Bettas maintain the health of their fins and muscles? To maintain the integrity of their organs, they flare their fins and gills.

You might consider it a beneficial form of exercise for the fish.

Utilizing mirrors for exercise is a terrific concept, much like using them to assist people pass time when they are bored.

Simply set a mirror in front of the tank and wait for them to catch a glimpse of themselves. Some bettas can even swim up to the mirror and attack the adversary from there. Just be careful that the exercise doesn’t go on for too long.

Why does betta fish flare too much?

As I have explained, your betta fish should never flare excessively. Their immune system may be compromised, which would make them much more vulnerable to illness.

While fish naturally flare, they usually only do so when something threatens them or when they’re having fun. However, there is another reason why fish flare.

Incompatibility with tank mates

One of the main causes of your fish’s frequent flare-ups may be a poor selection of tank mates.

It is common for male bettas to fight one another. However, a single male in a group of six female fish won’t cause any trouble for other fish species.

In a Betta aquarium, species including common guppies, Platies, swordtails, and black Mollies thrive.

FAQs

Closing Thoughts

As a new aquarist or someone who isn’t familiar with Bettas, finding them flaring at you is certainly distressing.

Bettas tend to flare at other fish and their own reflection when they feel threatened. But wait for a second! Why would they flare at you when you aren’t a fish or someone who can endanger their territory?

The answer is simple. They aren’t familiar with you or the new environment. As a result, they show aggression by puffing up their gills and fins to protect themselves.

I will walk you through some of the most common reasons for Betta flaring and how to make them comfortable.

References

• Seriously Fish — Species profiles and care data
• FishBase — Taxonomy and scientific data
• Practical Fishkeeping — Husbandry and care advice

Table of Contents

• Fish Species Overview
• What Most Care Guides Get Wrong
• Classification
• What Is Are They?
• Origin And Habitat
• Appearance
• Common Varieties (Types)
• Lifespan
• Average Size
• Blood Parrot Cichlid Care
• Community Tank Mates
• Breeding
• Food And Diet
• Common Health Problems
• FAQs
• What It Is Actually Like Living With Blood Parrot Cichlid
• Final Thoughts
• Is the Blood Parrot Cichlid Right for You?
• Species Comparison

Blood parrot cichlids are a man made hybrid that divides the hobby. Love them or hate them, they are here to stay. What most people get wrong is underestimating their size and their sensitivity to water quality. A blood parrot in a dirty tank loses color, develops black spots, and hides constantly. I have kept these for years and the fish you see hiding in a pet store corner is not the same fish you get in a clean, stable setup. But feeding is where most people fail. Their fused mouths cannot bite or tear food. The cichlid that needs you to rethink how feeding works.

The cichlid that needs you to rethink how feeding works.

What Most Care Guides Get Wrong About Blood Parrot Cichlid

Most care sheets list the minimum tank size for Blood Parrot Cichlid and call it a day. But a minimum is just that. In my experience, giving them more room changes their behavior completely. You see more natural movement, less stress, and fewer aggression issues. Another thing guides gloss over is temperament. Blood Parrot Cichlid are often described with a single label, but their behavior shifts depending on tank size, tank mates, and territory. You need to plan for the worst-case scenario, not the best. Group size is another area where most guides fall short. Saying ‘keep them in groups’ is not enough. The difference between keeping 3 and keeping 8 or more is night and day when it comes to coloration, confidence, and natural behavior.

The Reality of Keeping Blood Parrot Cichlid

Blood parrots are hardy, personable fish. But their hybrid origins come with real limitations that you need to accept before buying one.

Their mouths are deformed by design. Blood parrots cannot close their mouths fully. This is a feature of the hybrid, not a defect you can fix. It means they struggle to eat certain foods, cannot defend themselves against aggressive tank mates, and are vulnerable to mouth injuries. Feed pellets sized for their mouth and avoid aggressive species.

They are messy eaters. Because of their mouth structure, blood parrots drop a lot of food while eating. This means more uneaten food on the bottom, higher waste levels, and a greater need for filtration and gravel vacuuming.

Dyed blood parrots are an industry shame. If you see purple, blue, or green blood parrots, they have been dyed. This process is stressful, often involves injections, and the color fades over time. Never buy dyed fish. You are funding animal cruelty.

They are surprisingly shy. Despite their chunky appearance, blood parrots are nervous fish. They need caves and hiding spots to feel secure. A blood parrot without cover will spend its life stressed and pale.

Biggest Mistake New Blood Parrot Cichlid Owners Make

Keeping them with aggressive cichlids. Blood parrots cannot defend themselves properly due to their deformed mouths. Putting them with jack dempseys, convicts, or aggressive mbuna is setting them up to get beaten up. Choose peaceful tank mates only.

Expert Take

If you want a blood parrot, buy a natural red or orange specimen from a reputable source. Never buy dyed fish. Give them caves, feed them quality pellets, and keep them with peaceful tank mates. They will reward you with 10+ years of genuine personality.

Fish Species Overview

Scientific Name	Hybrid
Common Names	blood parrot cichlid, blood red parrot cichlid, freshwater parrot fish
Family	Cichlidae
Origin	Captivity
Diet	Omnivore
Care Level	Easy
Activity	Moderate
Lifespan	10 – 15 years
Temperament	Semi-aggressive
Tank Level	All levels
Minimum Tank Size	55 gallons for a single fish, increase by twenty gallons for each individual
Temperature Range	72 – 82°F
Water Hardness	6-18 dGH
pH Range	6.5 – 8.0
Filtration/Water Flow	Low
Water Type	Freshwater
Breeding	Egg-layers
Difficulty to Breed	Difficult
Compatibility	Compatible with larger community fish
OK, for Planted Tanks?	With Caution

Classification

Order	Cichliformes
Family	Cichlidae
Subfamily	Cichlinae
Genus	Hybrid origin
Species	Hybrid (Amphilophus citrinellus x Paraneetroplus synspilus)

What Is Are They?

The blood-red parrot cichlid is a medium to large tropical freshwater fish from the Cichlidae family. These strange, ball-shaped fish are instantly recognizable with their huge eyes and very small mouth. Their mouth is unusual in that it looks somewhat like a parrot’s beak, but it is actually a deformation.

These cichlids are pretty controversial because they are man-made fish and we don’t know exactly which parent species were used to breed the blood parrot cichlid. They are probably a hybrid of two or more Central American Cichlids. The prime suspects are the well-known Midas Cichlid and the Redhead cichlid.

Regardless of their controversial ancestry, these fish make excellent pets. Sure, they will look strange, but in a really cool way! These fish have bright colors and the most expressive eyes.

Blood parrot cichlids are also very interactive fish. They often swim up to meet you, especially if you’re the person who provides their dinner!

Origin And Habitat

The blood parrot cichlid is a hybrid fish, which means it was bred from two or more different species. They were first developed in Asia in the 1980s, and today they are popular in the aquarium trade all over the world.

Some hybrids can occur in nature, but blood parrots are only found in captivity. You could say that their natural habitat is the aquarium! In fact, it’s pretty unlikely that these unusual fish would be able to survive in the wild at all.

Appearance

Blood parrot cichlids are instantly recognizable by a combination of their bright orange colors, round body, humped shoulders, huge eyes, and small parrot-like mouths that can’t fully close.

They are clearly recognizable as cichlids, although their strange features make them look more like cartoon characters than wild fish!

Orange is the most dominant color, but there are other breeds too. Their large fins are the same color as their body, although they is darker, lighter, or even translucent.

The blood parrot’s eyes are one of its most unique features. Their pupil is large and often strangely shaped. The iris around their pupil contrasts strongly with blue or gold.

These features have become less extreme since they were first bred, but the parrot cichlid is still a very distinctive freshwater fish.

Blood parrot cichlids change a little as they grow older. Young fish often have dark markings toward the tail and less color than adults.

Common Varieties (Types)

Blood parrot cichlids come in a few different colors and breeds. Natural blood parrot cichlids vary from white to yellow and orange.

You will also come across the king kong blood parrot. This is a larger breed that has a normal mouth.

Unfortunately, there are some blood parrot breeding practices that should not be supported. If you ever come across a heart-shaped blood parrot cichlid, take a closer look. These fish have no tails because they have been cut off (video below).

Jellybean parrots are fish that have been dyed, and they are available in just about any color. Some breeders also tattoo their fish to enhance their colors or write messages on them. Rather get yourself a regular blood parrot. These fish have all the color, charm, and cuteness that you could ever need!

Lifespan

Blood parrots can make long-lived pets if properly cared for. This hybrid fish species has a typical lifespan of five to fifteen years.

Of course, there are many factors that decide the actual life span of any fish, including genetics, diet, water quality, and more. Take note of the care tips in this article to keep your pet healthy and live longer.

Average Size

Blood parrot cichlids are often sold at just two or three inches, which can catch beginner fishkeepers off guard. They will grow a lot larger as they mature and reach 6 or 7 inches in length.

Fortunately, these hybrid fish are relatively slow growers, which gives you plenty of time to upgrade their aquarium if necessary. Regular blood parrots max out around 8 inches, but there are some larger breeds too. The rarer king kong blood parrots can reach an impressive 12 inches.

Blood Parrot Cichlid Care

Blood parrot cichlids are easy to care for once you understand their feeding needs. Read on to learn how to create the perfect home for these adorable hybrid fish.

Aquarium Setup

The blood-red parrot cichlid is pretty undemanding when it comes to its care and aquarium setup. These fish will thrive in just about any tank that provides enough space.

If you’re setting up a new aquarium for blood parrot cichlids, you’re going to need some basic hardware like a heater, filter, and lighting. You’ll also need to cycle your tank before introducing your first fish.

Tank Size

The Blood red parrot cichlid is a big fish, so it needs a big fish tank. An 8-inch specimen is much bigger than it sounds when you factor in how tall and wide these ball-shaped hybrids can get!

They are fairly slow-growing fish, but it’s best to start out with a big enough tank from the beginning. You could keep a young specimen in a 29-gallon aquarium, but 55 is a much better bet. Add 20-30 gallons for each additional parrot cichlid you want to house.

Blood parrot cichlids are not the fastest fish in the world, but they sure can jump. Make sure your aquarium has a secure-fitting hood to avoid any mishaps.

Water Parameters

The blood parrot cichlid is pretty adaptable when it comes to water parameters. They are tropical fish, so they will need warm, stable water temperatures. Their preferred temperatures seem to be around 80°F, although they is kept down to about 75 °F.

Blood parrots are adaptable to soft or hard water, and they do great in pH levels between 6.5 and 7.5.

Ammonia and nitrite levels should always read zero when you test your water. However, these fish are not overly sensitive to nitrates if you perform regular water changes.

Filtration and Aeration

Good quality filtration is essential for keeping parrot cichlids healthy in the long run. Parrot cichlids are not the strongest swimmers, so they won’t appreciate a powerful current in their tank.

However, their inefficient eating habits mean a lot of uneaten food will accumulate in the tank. Therefore, high-volume but low-flow filtration is ideal. A canister filter with plenty of filtration media is always a good bet.

Additional aeration is helpful but not essential. You can run an airstone to increase oxygen levels in the water or aim your filters outflow toward the surface of the water. Breaking the water surface will allow more oxygen to mix into the water.

Lighting

Blood parrot cichlids do not have any particular lighting needs, but they should have access to a natural day/night cycle. The easiest way to do this is to use a timer set to 6 to 10 hours per day.

Of course, you don’t want your tank to receive any direct natural sunlight, as this can cause high temperatures and serious algae problems.

Aquatic Plants

Live plants can help to maintain great water quality for your blood parrot cichlids while making their tank more natural and attractive. Unfortunately, blood parrot cichlids are not the ideal fish for planted tanks, but that doesn’t mean it can’t be done. However, a lot will depend on your individual fish.

Some blood parrots will tear up plants, while others won’t touch them. Fortunately, most blood parrots have weak mouths, so they can’t do too much damage.

The biggest problem is that these fish may dig up the regular stem and rosette-type plants. Fortunately, you can still grow some amazing plants that don’t root themselves in the substrate.

Epiphytes like Java ferns and anubias are safe bets if secured to some sturdy hardscape. Floating plants like red root floater, Salvinia, and hornwort are also great options.

Decorations

Blood parrots often dig, and this is a problem for your decorations too. Carefully arranging rock piles and driftwood is pretty dangerous if your fish tip them over into the glass or onto themselves.

Blood parrot cichlids is shy, especially while they are still adjusting to a new fish tank. Caves and tunnels between your hardscape make great hiding places, and broken clay pots work just as well.

Avoid using tall, heavy ornaments, especially near the walls of your tank. However, driftwood, flatter rocks, and aquarium-safe ornaments are great choices.

Substrate

Sand is the ideal substrate for blood parrot cichlids because it is safe for them to dig. However, rounded gravel is also a great choice.

Avoid sand or gravel with sharp edges, and don’t bother with aquarium soils for rooted plants because these fish will just dig up your aquascape.

Tank Maintenance

Blood parrot cichlids are not particularly sensitive to nitrates, but like all fish, they deserve the best water quality that you can provide.

Testing

Purchase a water test kit before you add your parrotfish. You will need it during the aquarium cycling process. You’ll also need to test your water regularly once your tank is ready and you have added your fish.

Testing is the best way to monitor the build-up of nitrates in your aquarium, and this information will help you design a tank maintenance schedule that is perfect for your setup.

Vacuuming

These messy fish leave a fair amount of food to sink to the bottom, so remove whatever doesn’t get eaten. Vacuuming your gravel while performing a water change is the best way to remove poop and waste particles trapped between your substrate.

Water Changes

Partial water changes are essential for maintaining your blood parrot cichlid aquarium. Depending on the size and stocking of your tank, you will need to do this every one or two weeks.

Remember to dechlorinate new water before adding it to your aquarium. Some of the chemicals found in tap water is harmful to your aquarium bacteria, plants, and animals.

Community Tank Mates

One of the great things about blood parrots is that they are pretty safe with other fish. Sure, they is pretty aggressive, especially when spawning, but they just don’t have the tools to do a whole lot of damage.

However, some modern blood parrots are bred with larger mouths, and these fish will not be safe with smaller tank mates.

One of the best tank mate species for blood parrot cichlids is other blood parrot cichlids. That’s right, and these funny fish can get along great with their own kind. However, they is kept with many other cichlids too.

The following cichlid species can make good tank mates for blood-red parrots:

• Blue acara
• Severum
• Green terror cichlid
• Oscar
• Texas Cichlid – will breed with them

In fact, most peaceful fish species that enjoy the same water parameters will make good blood parrot tank mates. However, you should avoid very small fish because your blood parrot will try to swallow them!

Here are some potential tank mates that you can try:

• Larger gouramis
• Large tetras
• Barbs
• Clown loaches
• Silver dollars
• Plecos

Tank Mates to Avoid

Avoid aggressive fish that can hurt your blood parrots. Any large, carnivorous species that could swallow your parrotfish whole is a risky choice!

Small fish like rasboras, badis, and endler’s livebearers can make a nice snack for your blood parrot cichlids. Sure, these hybrids aren’t exactly built for the kill, but they is persistent!

Fish species that have special care requirements like cool water or fast currents should be avoided. Unfortunately, that rules out fancy goldfish as tank mates.

Breeding

Male Blood parrot cichlids are sterile, so these hybrid fish are very difficult to breed in the home aquarium. They do form pairs, and they may even lay eggs, but they are infertile and rarely hatch.

Pairs will be very aggressive towards other fish at this time, and they will dig up the substrate to create a spawning area. However, the adults end up eating the eggs when they begin to develop fungi.

Female blood parrot cichlids are often fertile, and they can actually breed with other cichlid species like red devils. Sexing blood parrot cichlids is tricky, although males have longer and more pointed fins.

Food And Diet

Feeding is probably the trickiest part of keeping blood parrot cichlids. Firstly, their small mouths don’t open and shut like other fish, so they struggle to get food into their mouths. Secondly, they are easily outcompeted by faster-moving fish in their tank.

Avoid overfeeding your tank to overcome these issues, as this will only impact your water quality. One, two, or three meals per day is enough; just keep an eye on your fish to make sure they are getting a good meal.

Keep reading to learn about the best foods to feed blood parrots.

Daily Diet

There are some excellent pellets formulated specifically for the blood parrot, but you can provide any high-quality, soft pellet that is small enough for them to swallow.

Sinking foods are better since they lessen the chance of swim bladder problems, but many fishkeepers use floating foods without any issues.

Supplements

Supplements are foods that you can provide once a week or so to boost your fish’s condition. Frozen foods like blood worms and brine shrimp are great supplements, but your blood parrots will struggle to feed on them.

Supplementing your parrot cichlid diet with shelled peas once per week is beneficial too. Simply boil them briefly and remove the outer shell.

Common Health Problems

Blood parrot cichlids are very hardy and not prone to disease if kept in good conditions.

In the early days, blood-red parrot cichlids were quite heavily deformed and prone to various illnesses. These days the fish are more robust. Nevertheless, this hybrid species is susceptible to swim bladder problems.

Swim Bladder Disease

Swim bladder disease is a common condition in aquarium fish that causes swimming difficulty. Affected fish will sink to the bottom of the tank or float at the surface, and some even swim upside down.

Mild cases is solved by feeding shelled peas, but Epsom salt baths is necessary for more serious situations.

Other Health Issues

Blood parrot cichlids are susceptible to most of the common aquarium fish illnesses. These show up after introducing diseased fish to the tank or when your fish are under stress from poor water quality or bullying from other fish.

Keep an eye out for the following symptoms:

• White spots on your fish’s body. This is a common symptom of a parasitic infection called ich.
• Flashing. Fish scratch their itches by rubbing against the substrate or decorations in their tank. This behavior can be a sign of infection or poor water quality.
• Torn fins and sores on the body. Torn fins can be a sign of fin nipping and bullying by other fish, but it can also be a symptom of other conditions like bacterial infections and a compromised immune system.
• Rapid Breathing. A variety of stressors can cause rapid breathing. Testing your water quality for issues is the first step when identifying health problems in your fish, and increasing oxygen levels with an airstone can be helpful.

FAQs

What It Is Actually Like Living With Blood Parrot Cichlid

Blood parrots are the dogs of the fish world. That is not an exaggeration. A blood parrot will learn your face, swim to the front of the tank when you walk into the room, and beg for food with the same shameless enthusiasm every single time. They recognize the difference between the person who feeds them and a stranger. After a few months, you stop thinking of them as fish.

The color changes tell you everything about their mood and health. A happy, comfortable blood parrot glows deep orange to red. A stressed one fades to pale peach and develops dark patches. You will learn to read your fish like a mood ring, and that feedback loop makes you a better fishkeeper whether you realize it or not.

Watching them eat is equal parts endearing and frustrating. Their deformed mouths mean food falls out constantly. They chase pellets around the tank, grab one, drop half of it, and go back for more. You need to accept that some food waste is inevitable and plan your filtration accordingly. It is part of the deal with this fish.

Final Thoughts

A blood parrot in clean water is a completely different fish than one in a neglected tank.

Parrot cichlids are one of the most adorable freshwater fish in the hobby. They will not be for everyone, and it’s understandable that many aquarists prefer to steer clear of hybrids. Keep these fish if you want a pet with great color and personality, but be prepared to provide for its special feeding needs.

Do you keep blood parrot cichlids? Share your experiences in the comments below!

South American Cichlid Species Directory

This article is part of our South American Cichlids: Complete A-Z Species Directory. Visit the hub page to explore care guides for all 32 South American cichlid species we cover.

No fish will replace your gravel vac. I want to set that expectation right upfront. But after 25+ years building community tanks, I’ve come to genuinely rely on a good clean-up crew to handle the in-between work: grazing algae off the glass, picking up leftover food before it rots, and sifting through substrate. The right mix of bottom dwellers and algae eaters makes a real difference in water quality and tank aesthetics. Here’s what I actually use and recommend.

What Are Clean-Up Crew Fish?

You might have heard the phrase ‘clean up crew’ and wondered what it refers to. Well, your clean-up crew (CUC) are the animals that help to keep your aquarium clean!

These fish and invertebrates keep your tank looking beautiful for longer, and they can even help to keep your other pets healthy.

They do this by eating algae and uneaten food in your aquarium before it spoils. Some species even clean your substrate (sand/gravel) by searching for food morsels between the grains and the stems of plants.

Clean-up-crew animals are not a replacement for good old-fashioned tank maintenance, but they can reduce the amount of cleaning that you need to do. As a bonus, these fish and inverts are also fascinating and beautiful creatures, so they add a ton of interest to any tank!

Are you ready to learn about 10 amazing clean-up crew animals for freshwater aquariums? Let’s get started!

Top 10 Fish That Clean Tanks

So now you know what clean-up crew animals do and how they can benefit your fish tank, but how do you choose the right species?

Careful research is important before choosing any aquarium inhabitant. Aquarists should ensure that the new fish, animal, or plant will be happy in their tank size and water parameters and get along with their existing tank mates.

We have a video below posted from our YouTube Channel for you visual learners. We go over more details in our blog post. If you enjoy our content, be sure to give us a sub on YouTube. We post new videos every week!

Consider the following important stats before making your choice:

• Scientific name
• Temperament
• Care Level
• Origin
• Adult Size
• Benefits for your tank
• Minimum tank size
• Preferred water temperature range

1. Corydoras Catfish

• Scientific name: Corydoras spp.
• Temperament: Peaceful
• Care Level: Easy
• Origin: South America
• Adult Size: 2-3 inches
• Benefits: Eats leftover food and cleans the substrate
• Minimum Tank Size: 20 gallons
• Temperature: 74 – 80 °F

Corydoras are classic clean-up crew fish that deserve a place in almost any freshwater aquarium. These cute little catfish are wonderful community fish that get along with a huge variety of peaceful tank mates.

Cory cats really shine when it comes to keeping your substrate clean. These small schooling fish scour the bottom for leftover fish food and actively search through the gravel and between plant stems to look for scraps.

2. Loach

Dwarf Chain Loach” class=”wp-image-1061557″/>

• Scientific name: Pangio, Misgurnus, etc.
• Temperament: Peaceful to semi-aggressive
• Care Level: Easy to moderate
• Origin: Asia
• Adult Size: 2 -12 inches
• Benefits: Eats leftover food, cleans substrate, and controls pest snail populations
• Minimum Tank Size: Species dependent
• Temperature: Species dependent

Loach fish are great bottom-dwellers that will keep your tank clear of uneaten fish food. These peaceful fish come in a wide range of shapes, colors, and sizes.

Loaches are also great for controlling pest snails. These fish can be a little shy during the day, but their crazy antics are very entertaining.

Small species like the kuhli loach are great for tanks in the 20-gallon range, while larger loaches like the weather loach are suitable for larger tanks of 50 gallons or more.

3. Bristlenose pleco

• Scientific name: Ancistrus sp.
• Temperament: Peaceful
• Care Level: Easy
• Origin: South America
• Adult Size: 5 inches
• Benefits: Algae removal from hardscape and glass, and substrate cleaning
• Minimum Tank Size: 30 gallons
• Temperature: 72 – 82 °F

Bristlenose plecos are excellent algae-eating fish for freshwater tanks. These strange-looking catfish are true bottom dwellers that use their sucker mouths to graze on algae and diatoms (brown algae) on many surfaces, including your aquarium decorations and glass.

These strange-looking fish are generally very peaceful, although they can be territorial with their own species. Keep a single bristlenose pleco in your tank with plenty of driftwood and hiding places to enjoy all the benefits this fish has to offer.

4. Flagfish

• Scientific name: Jordanella floridae
• Temperament: Semi-aggressive
• Care Level: Easy
• Origin: Florida, USA
• Adult Size: 2.5 inches
• Benefits: Controlling algae growth
• Minimum Tank Size: 10 gallons
• Temperature: 66 – 72 °F

The American Flagfish is an underrated champion when it comes to eating algae. These small freshwater fish feed on many types of algae, including hair algae, brown algae, and green algae. They even have a reputation for eating tough types like black beard algae.

5. Geophagus & Satanperca Cichlids

• Scientific name: Geophagus spp., Satanperca spp. etc.
• Temperament: Peaceful to aggressive
• Care Level: Easy to Advanced
• Origin: South America
• Adult Size: 4 – 12 inches
• Benefits: Substrate cleaning
• Minimum Tank Size: 50 -100 gallons (depending on species)
• Temperature: Species dependent

Geophagus and Satanperca are two popular genera of South American cichlids¹. These fantastic substrate cleaners are commonly known as eartheaters and they come in a huge range of sizes and colors.

Earth-eaters feed by sifting through the substrate. They do this by taking mouthfuls of sand, filtering out the food particles, and expelling the rest back out through their gills.

There are various species, but most eartheaters are larger fish that need a fairly large tank to thrive. Their care and temperament differ by species, so make sure to research carefully before buying a school of these fascinating fish.

6. Rainbow Shark

• Scientific name: Epalzeorhynchos frenatus
• Temperament: Semi-aggressive
• Care Level: Moderate
• Origin: Southeast Asia
• Adult Size: 6 inches
• Benefits: Controlling algae and eating leftover fish food
• Minimum Tank Size: 50 gallons
• Temperature: 70 – 79°F

Rainbow sharks are great for cleaning up uneaten fish food, but they are also great algae eaters for a larger freshwater aquarium.

These streamlined bottomfeeders are semi-aggressive fish, so keep them with similar-sized tropical fish species and make sure they are the only shark in your fish tank.

Rainbow sharks are available in the wild type, with a dark body and red fins, or the albino version with a red eye and white body. GloFish rainbow sharks are also available in dazzling shades like Cosmic Blue and Sunburst Orange for fish keepers who want even more color.

7. Molly

• Scientific name: Poecilia latipinna/ P. sphenops
• Temperament: Peaceful
• Care Level: Easy
• Origin: South & North America
• Adult Size: 3 inches
• Benefits: Great algae-eating fish
• Minimum Tank Size: 30 gallons
• Temperature: 68 – 82°F

Molly fish are one of the most popular species in the aquarium hobby. These easy fish are excellent algae eaters for a freshwater aquarium. They will eat algae from any surface, including your aquarium ornaments and the leaves of live plants.

Molly fish are livebearers, so they are super easy to breed in the home aquarium. They also come in many colors, patterns, and fin shapes, so there is a variety to suit almost any tank!

8. Slim Bodied Goldfish

• Scientific name: Carassius auratus
• Temperament: Peaceful
• Care Level: Easy
• Origin: China
• Adult Size: 6 – 8 inches
• Benefits: Helpful algae eater for lightly stocked cool-water aquariums
• Minimum Tank Size: 30 gallons
• Temperature: 65 – 75 °F

Did you know that goldfish can make great algae-eating fish? Slim-bodied types like commons and comet goldfish can help to keep your freshwater tank clean. However, goldfish can be messy themselves if overstocked in a small tank.

Goldfish are not suitable for a tropical tank because they are at home in cool water temperatures. Your goldfish tank should be at least 30 gallons, and beware; these fish will eat plants.

9. Amano Shrimp

• Scientific name: Caridina japonica
• Temperament: Peaceful
• Care Level: Easy
• Origin: Japan
• Adult Size: 2 inches
• Benefits: These shrimp are excellent algae eaters for a planted tank
• Minimum Tank Size: 10 gallons
• Temperature: 60 – 80 °F

The Amano shrimp is one of the best algae eaters for a nano freshwater aquarium. These awesome crustaceans feed on a variety of algae types, and they will keep your aquarium plants clean and healthy.

Amano shrimp are very peaceful towards other tank inhabitants, but they are vulnerable to predatory fish species and other aggressive tank mates.

Amano Shrimp are not the only algae-eating shrimp. Dwarf shrimp species like cherry shrimp and glass shrimp will also eat food scraps and help to control algae.

Bamboo shrimp are another fascinating invertebrate species. These guys are filter feeders, which means they eat tiny food particles that are suspended in the water column.

10. Aquarium Snails

• Scientific name: Various
• Temperament: Peaceful
• Care Level: Easy
• Origin: Worldwide
• Adult Size: 0.5 – 2 inches
• Benefits: Snails are excellent algae eaters and they eat fish waste and leftover fish food
• Minimum Tank Size: gallons
• Temperature: 68 – 82°F

Snails are one of the best clean-up crew animals for freshwater aquariums. Snails eat algae, uneaten food, and fish waste, all the things that we don’t want to see in our tanks! However, choosing the right species for your tank is important.

Snails get a bit of a bad rap because some species have a tendency to multiply. These invertebrates tend to breed out of control in aquariums that are overfed and undermaintained. Nevertheless, some species are much easier to manage than others.

Choose rabbit snails, mystery snails, and nerite snails if you would prefer to keep the population low. Ramshorn snails, Malaysian trumpet snails, and pond snails should be added with caution.

Bonus Species

Looking for even more algae eaters? Check out these great algae-eating fish and aquarium inhabitants:

• Siamese algae eater – Crossocheilus siamensis

Siamese algae eaters are peaceful fish that grow to about 6 inches. They are excellent algae eaters for aquariums of 30 gallons or larger.

• Chinese algae eater – Gyrinocheilos aymonieri

Chinese algae eaters are similar to the Siamese algae eater but grow much larger. These fish are fantastic for controlling algae, but they have a reputation for eating the slime coat off their tank mates when they get older.

• Otocinclus catfish – Otocinclus spp.

Otos are the perfect algae eaters for a nano freshwater tank. These tiny catfish will keep your plants and glass sparkling clean without harming your shrimp or other fish.

• Twig catfish – Farlowella acus

Twig catfish are another excellent algae eater that won’t bother other fish in your community tank. These unusual creatures look just like twigs and reach about 6 inches in length.

Caring For Them

Clean-up fish and other helpful animals like algae-eating shrimp and snails can do an amazing job of cleaning up your aquarium, but they need care just like any other pet. That means you need to observe their preferred temperature range, water parameters, and minimum tank size.

Algae eaters can make your tank look brand new in just a few days, but it’s what you can’t see that can become really dangerous. Test your water regularly to monitor the water quality in your aquarium.

You will need a heater for most species, and good-quality filtration is vital. Remember to provide your pets with a natural day/night cycle by running your aquarium lighting on a timer.

Feeding Your Crew

Your clean-up fish can be split into two categories. Algae eaters and bottom feeders. Many species fit into both groups, but some species have specialized diets and require specific supplements.

Typical bottom feeders like corydoras catfish and loaches will require sinking fish foods, while specialized algae eaters like Otocinclus catfish will need an extra food source if they manage to eat all the algae in your tank.

Supplement your cleaner fish and animals with the following foods:

• Frozen food like brine shrimp
• Algae wafers
• bottom feeder pellets
• Blanched vegetables like zucchini

Keeping Your Aquarium Tidy – Other Factors to Consider

Algae-eating fish and invertebrate species can do a wonderful job of cleaning your fish tank, but they are not a replacement for aquarium maintenance. Remember, even cleaning up fish produce waste.

Several factors contribute to algae growth and mess in your aquarium, and these factors tend to work hand in hand.

Clean-up fish may help your tank’s ecosystem function more efficiently, but they cannot maintain good water quality in the long run. If you are considering adding clean-up animals, you might already have a water quality issue.

So how do you improve water quality?

Filtration

The first step is to run good filtration. Your filter has some unexpected benefits for your aquarium. Firstly, filtration removes a lot of the physical waste particles from your water, leaving it visibly cleaner.

More importantly, your filter is home to vast numbers of beneficial bacteria. These are the ‘good guys’ that turn dangerous nitrogen compounds like ammonia into relatively safe nitrates.

However, your filter cannot capture all the solid particles because many of them drop to the bottom and collect. Your beneficial bacteria cannot remove nitrates either, so regular aquarium maintenance is vital.

Proper Aquarium Maintenance

The most important aquarium maintenance task is the partial water change. This involves physically removing a percentage of your aquarium water and replacing it with new dechlorinated water. Typically you’ll need to replace 25-50% of your aquarium water every 1 to 3 weeks.

You can design your maintenance schedule based on the results of water testing, and the frequency and volume of your water changes are determined largely by the next few factors listed below.

Aquarium Stocking Levels

The more fish you have, the more you need to feed them, and the more waste they will produce. Unfortunately, you cannot fix an overstocked fish tank by adding more fish!

So how many fish can you keep? Well, there is no simple answer. The old guideline of 1 inch of fish for every gallon in your tank is helpful, but this rule has serious flaws.

Your tank’s maximum stocking level depends on the factors discussed below, but it’s always wise to slightly understock your aquarium.

Low-maintenance vs. Messy

Some fish are messier than others. For example, larger fish like Oscars and other cichlids can be messy feeders that leave a lot of uneaten food to sink and decay in your tank.

These fish can be hard on your clean-up crew and often require plenty of space, strong filtration, and frequent maintenance.

Low-maintenance fish like mollies are a great choice because they do a good job at hunting down food scraps. They will even keep their own tank free of most algae.

Small vs. Large

Larger fish eat larger meals and produce more waste, so think carefully before buying a monster fish. However, A small aquarium does not necessarily stay cleaner than a large one. Small tanks can be very unstable and tend to require more frequent maintenance.

A large aquarium with small fish is a great option if you wish to minimize aquarium maintenance. Adding live plants will make a huge difference too.

Read on to learn about the benefits of keeping a planted tank.

Live Plants Keep Algae at Bay

Live aquarium plants are a beautiful addition to any aquarium. They provide a natural environment for your fish, they’re fun to grow, and they look great. However, plants do even more than that!

Live plants compete with algae, so they are one of the best options for keeping your tank clean. Plants also use nitrates and phosphates as a fertilizer, turning harmful compounds into beautiful new growth.

FAQs

Final Thoughts

Practically any freshwater aquarium can benefit from one or more of the amazing clean-up fish and invertebrates in this article. If you’re like me, you might find that these fascinating creatures become your favorite animals in the tank!

Just remember that you need to perform regular maintenance in your tank no matter what, and even bottom feeders and algae eaters need good care and regular feeding. Which clean-up crew animals do you keep? Tell us about your favorites in the comments below!

Table of Contents

• An Overview
• What Is A Severum Cichlid
• Origin And Habitat
• Appearance
• 5 Common Varieties
• Lifespan
• Average Size
• Care
• Common Health Problems
• Classification
• FAQs
• What It Is Actually Like Living With Severum Cichlid
• Closing Thoughts

Severums are the fish people buy when they want discus but are not ready for the commitment. That is fine, because severums are hardier, more forgiving, and still stunning. But they still get big, still need warm water, and still become territorial when breeding. I have kept both for years and the biggest mistake I see is people putting severums in tanks that are too small because they bought them as juveniles. A 4 inch severum turns into an 8 inch severum faster than you expect. The discus alternative that forgives the mistakes discus never would.

Discus beauty on a community tank budget.

What Most Care Guides Get Wrong About Severum Cichlid

Severums constantly get marketed as “poor man’s discus,” and while I understand the comparison. They’re both round, colorful South American cichlids. It sets the wrong expectations. Severums are their own fish with their own personality. They’re hardier than discus, more interactive, and significantly more territorial. I’ve seen keepers buy severums expecting a discus temperament and then get surprised when their severum starts rearranging the tank and bullying smaller fish. The other thing most guides understate is how big these fish actually get. A full-grown severum can hit 8-10 inches, and at that size, a 55-gallon tank is genuinely too small for a pair.

They’re not a beginner fish. They need real space (55 gallons minimum, more is better), they’ll eat small tank mates, and they’ll demolish live plants. But for an experienced keeper who wants a large, personable South American cichlid with personality, severums are a great pick. Here’s everything you need to know to keep one successfully.

The Reality of Keeping Severum Cichlid

Severums are genuinely one of the easier large cichlids to keep. But easier does not mean effortless. Here is what you need to actually prepare for.

They get bigger than you expect. People see juvenile severums at 3 inches in the store and think they stay that size. They do not. A full-grown severum hits 8 inches and needs a 55 gallon tank at minimum. A pair needs 75 gallons or more.

They eat your plants. Severums are herbivores that will mow down soft plants like a lawnmower. Java fern, anubias, and other tough plants survive. Anything delicate is lunch. Plan your aquascape accordingly.

They bond with their owner. Severums are one of the more interactive cichlids. They learn to recognize you, follow your movements, and some will take food from your hand. This is a fish with genuine personality.

Pairs is aggressive. A bonded pair of severums guarding eggs will defend their territory fiercely. In a community tank, this can mean other fish get pushed into corners or harassed. You need enough tank space to give everyone room.

Biggest Mistake New Severum Cichlid Owners Make

Keeping them in a 29 or 30 gallon tank because they looked small at the store. Severums need room. A single fish needs 55 gallons, and if you plan on a pair, 75 is the starting point. Cramped severums become stressed, pale, and aggressive.

Expert Take

If you want a large, personable cichlid that does well in a planted tank without the extreme demands of discus, a severum is the best option in the hobby. Go with a gold severum for maximum color or a green severum for a more natural look. Either way, you will not be disappointed.

An Overview

Scientific Name	Heros severus
Common Names	Severum Cichlid, Banded Cichlid, Rainbow Severum Cichlid
Family	Cichlidae
Origin	Orinoco and upper Rio Negro basins, South America
Diet	Omnivore
Care Level	Moderate
Activity	Active
Lifespan	7 to 10 years
Temperament	Semi-aggressive
Tank Level	Bottom and mid
Minimum Tank Size	55 gallons
Temperature Range	75 F° to 84 F°
Water Hardness	4 to 6 dH
pH Range	6.0 to 7.5
Filtration/Water Flow	Low
Water Type	Freshwater
Breeding	Egg-layers
Difficulty to Breed	Easy
Compatibility	Community tanks (with large enough fish)
OK, for Planted Tanks?	With Caution

Classification

Order	Cichliformes
Family	Cichlidae
Subfamily	Cichlinae
Genus	Heros
Species	H. Efasciatus (Heckel, 1840)

What Is A Severum Cichlid

Severum Cichlids have been in the aquarium hobby since the 1800s¹ and the reasons are apparent: their pleasant personalities, large size, and unique and attractive color patterns have made them very popular to aquarists.

These freshwater fish species are scientifically named Heros Severus while commonly known as Severum Cichlids, Rainbow Severum Cichlids, and Banded Cichlids.

Apart from adding a diversity of colors to your aquarium, these fish can are one of the rare large fish that can actually be considered community fish (as long as the fish housed aren’t small enough to fit their mouths)

Origin And Habitat

Severum Cichlids, also labeled as a Poor Man’s Discus, hail from the upper Orinoco and upper Rio Negro Basins in South America.

They were first sighted in the 1800s by an Austrian zoologist and ichthyologist named Johann Jakob Heckel. In their natural habitat, they inhabit slow-moving and vegetated areas with underwater trees and plants.

Appearance

Finding a fish that exhibits a beautiful spectrum of unique colors and patterns, pleasant personality traits, and the ability to bring liveliness to a traditional home aquarium is not impossible anymore.

Severum Cichlids fit well in the showcase fish role. These Cichlid Fish come in different varieties, and each variety has a special color pattern that helps it stand out.

, Severum Cichlids have large oval-shaped compressed bodies with a golden hue dispersed over their entire frames. These bands are visible along the sides and are more vivid in juveniles. Adult Severum Cichlids feature duller stripes. The fry feature consistent gold colors that become flecked with burnt orange spots across a large part of their bodies and fins. There are almost 8 bands present on their bodies, which go dull as the fish ages.

But awkwardly enough, noticing these bands in fry is hard. You can only see that clearly once the juveniles hit maturity.

Severum Cichlids feature sharp anal and dorsal fins that look rather yellow. Their pectoral fins also look pointed. The first set of fins narrows down to a striking point. And in most fish, these fins extend past the caudal fin, giving them a round-shaped look.

Apart from yellow dorsal fins, they have yellow eyes and beautiful tails with a combination of a white base and specks of yellow.

These fish are sold in fish sizes when they are small, but they can grow to an impressive size if you properly look after them.

Since there are different types, it is slightly hard to recognize the original one. To identify which one is real, look at the greenish-hued body combined with a golden-yellow underbelly. Nowadays, you can see alternations in their color patterns that are obtained by home breeding.

These fish are well-known for their subtle orange. These fish will get more intense in color as they mature.

Depending on what species you have, you can expect to see changed color morphs, as well as stripes. Some fish have large and vertical stripes, while others only exhibit extremely contrasting spots that sit perfectly with their yellowish-golden base.

And unlike African and South American Cichlids, Severum Cichlids look flattened and are tall with a vertically rounded shape. The reason they are called poor man’s discus lies in the fact that they mimic the profile of the more pricey discus fish.

To differentiate males from females, look at the size and markings on their gills. The male Severum Cichlid is larger and may develop a nuchal hump and extensions to its anal and dorsal fins. This makes the overall appearance more prominent compared to the female Severum.

Another difference between males and females is the dark spot visible on the female’s dorsal fin. Females also lack patterning on their heads.

Now it’s time to talk about the five most common varieties of Severum Cichlids!

5 Common Varieties

In the aquarium hobby, there are different types of Severum Cichlids. Introducing any type to your tank is a good change from the wild Severum Cichlids that have subdued colored bodies.

Heros Severus

This type of Severum Cichlid is the most recognized compared to others. It has yellow and golden spots, a flat body with pointed dorsal fins, and a tail. They sometimes feature dark stripes down their length and make a beautiful addition to dull aquariums.

These fish is semi-aggressive around some specific species. Usually, they do well in a community tank, so make sure you select the right tank mates for them (we discuss tankmates later in this post).

Heros efasciatus

Heros efasciatus, Redhead Severum, or Red Shoulder Severum are the same fish. This type isn’t as common , but it is incredibly beautiful in its own right. They feature a golden base and bright red spots behind their gill covers, and a vibrant green color as well. 

They are available as wild-caught, which makes them more sensitive to tank-bred species. Because they are in high demand, they command a high price tag at the local fish store.

Heros liberifer

Fish of this type feature a plain glistening white base that will sometimes look red or orange.

They have prominent horizontal deep black stripes. Unlike Heros Severus, they are more aggressive and can give a tough time to their tank mates.

Heros spurius

This type of Severum Cichlid is duller than the others mentioned previously. They have hues and stripes visible all across their bodies, including their fins and tails. They can grow up to 7 inches in length.

Heros Notatus

You can find different color varieties with this type of Severum Cichlid. They is purple, orange, green, and yellow. They are known for their spotted bodies. This Severum Cichlid has spots all over their bodies, fins, and tails.

Author's Note: Green Severum Cichlids are the most common and easily found type in pet stores. The Gold variety is the second most common type of Severum Cichlids found in the aquarium trade.

Lifespan

The average lifespan of a Severum Cichlid is around 5 years. With proper care, they can live as long as 10 years in an aquarium.

This makes them a perfect pet for those fish owners who want to spend more time with their pets and establish a stronger connection with their aquatic friends.

Average Size

The Severum Cichlid is known to grow to an impressive size both in the wild and in a home tank.

The Severum Cichlid can go as large as 8 inches. You need to focus on its diet, tank conditions, water quality, and what type of tank mates it has around it to ensure healthy growth. It will suffer from stunted growth as a result of stress. So, ensure there’s nothing in the tank that can stress your pet out.

Care

Severum Cichlid care is actually pretty basic compared to other large fish species. If you’re an ambitious beginner, and you understand their temperament, and what things fit them best in a home tank, you can have a great experience with them.

The Severum Cichlid is a hardy fish capable of adapting to harsh conditions in the wild. Some fish cannot survive what they can peacefully put up with. But it doesn’t mean you should ignore regular maintenance and a proper tank setup.

The Severum Cichlid is a peaceful fish. Unlike other Cichlid species that can fight to the death over food or maintain control over their territory, they remain relatively calm.

However, they can act potentially aggressively around other fish. It is territorial aggression or the overwhelming effect of attacking the smaller fish. Once they show aggression or signs of stress, make sure you separate them from the cause of stress. The Severum Cichlid can fall prey to diseases because of high levels of stress.

Providing good care and a safe environment will create a strong preventive shield from diseases.

Aquarium Setup

Severum Cichlids get large and need an appropriately sized home to make themselves comfortable. A large environment with clean water will help stress low and your fish healthy.

When it comes to setting up an aquarium, you should think about the Severums habitat in the wild. These fish come from murky waters that have low water flow. Knowing this, we do not want high water flow for our gentle giants. They are surface swimmers, so open space is ideal for them.

Open space will get them to swim around, and a large space will keep aggression down. These fish, which gentle in nature can get territorial. A crowded tank will lead to disputes and fighting. Rocks are preferred over driftwood as these fish like to dig. They will stay active throughout the day.

Tank Size

Severum Cichlids don’t grow overnight. But while setting up their tank, considering their growth rate can help decide the size of the tank. Usually, a 55-gallon tank does best for a Severum Cichlid. Feel free to get a larger tank because it’s always better to invest in a spacious tank for your pet.

Baby Severum Cichlids grow half an inch a month. Once they get to a certain size, you will see a decline in their growth rate. It takes them 2 years to become 8 inches long. Depending on the number of species you have, you can go for a 70-100 gallon tank for fully grown Severum Cichlids and other fish of similar size.

Water Parameters

Severum Cichlids live in tropical water areas of South America. To provide them with the healthiest environment, maintaining the right water parameters is necessary.

Keep the water temperature between 75 F° to 85 F°. Anything below this range will stress out your pet. The range can vary if you want to breed your fish though.

For pH, keep it between 6.0 to 7.0. Make sure pH levels remain stable. Any drastic changes can harm your fish. As for water hardness, I recommend staying between 4 to 15 dGH.

Filtration and Aeration

Facilitating regular water changes is a great way to maintain a healthy tank environment.

A freshwater tank can accumulate several nutrients from waste, such as nitrites, nitrates, and ammonia. Fish waste will contaminate your water quality.

It’s better to make regular water changes of up to 20% to ensure a healthy environment. You can also use a high-quality canister or hang-on-back filter to keep the water well-oxygenated.

Author's Note: Severum Banded Cichlids often gasp for air at the surface when the oxygen levels are low. This often leads to high levels of distress in the fish. If your fish constantly repeats it, it's time to clean out the aquarium water.

Lighting

Lighting is not an issue when it comes to Severum Cichlids. They mostly stay active throughout the day and rest throughout the night. A mild exposure to natural lighting is great.  You can also use light LED lights to monitor their activities or to enhance their appearance.

Aquatic Plants And Decoration

Designing the interior of your Severum Cichlid freshwater tank is one of the most enjoyable aspects of the aquarium hobby.

In the wild, they thrive in highly vegetated water and use plenty of hiding spaces to rest in.

While designing their tank, you can use different live plants, plastic caves, and castle accessories. Adding driftwood and rock formations are also some good choices.

This way, your fish will stay busy exploring different things and feeling at home.

While the Severum Cichlid needs hideouts, it is problematic for you to keep the decorative items in place. They have a tendency to dig below decorations. You need to to have them set at the tank glass bottom, so they don’t topple over if dug up.

Live plants are a major challenge with Severums. While many guides you will find online will tell you there are some plants like Anubias and Hornwort that can survive, our experience tells us that this is not the case. Severums are best kept with aquarium rocks over live plants.

Tank Maintenance

Regular tank maintenance holds great value for the well-being of Severum Cichlid.

Cichlids produce chunks of bioload. Apart from getting a good-sized canister filter, you should clean the tank every now and again to keep decorative items, the tank, and the underwater environment clean.

Here are some tank-cleaning tips to get you started:

• Occasionally trim the plants and remove plant material from the tank.
• Use aquarium water and a clean toothbrush to wash caves and other decorative items
• Use an algae scrapper to clean off algae from the tank walls.

Substrate

Severum Cichlids will dig around a lot. They love to create hills and pits by moving sand. You don’t have to be too creative with layering the base since they will redecorate it anyway.

I recommend using a fine sand substrate for the Severum tank. You can also use a little bit bigger grains but don’t good too large on the gravel as large gravel can injure these fish when they try to dig

Pro Tip: In community tanks that need softer water. You can layer the top of the substrate. You can use Indian almond leaves or small clumps of peat moss. This will benefit water conditions. Using leaves will also help create the effect of their natural habitat. Also, make regular replacements as the debris deteriorates.

Is the Severum Cichlid Right for You?

Before you commit to this species, here’s an honest assessment of whether it fits your setup and experience level.

• Great for keepers who love the discus look but want easier care. Severums tolerate a wider range of water conditions and are far more forgiving.
• Need at least 75 gallons for a pair. These fish get big, and they need room to establish territories without constant conflict.
• One of the more personable cichlids. They recognize their owners and develop distinct behavioral patterns over time.
• Not ideal for planted tanks. Severums are known plant eaters. They’ll systematically destroy most aquarium plants.
• Good for semi-aggressive community tanks. They coexist well with similar-sized South American cichlids, large tetras, and plecostomus species.
• Skip if you want a hands-off tank. They produce significant waste and need strong filtration plus regular water changes.

Community Tank Mates

Placing your Severum Cichlid with the right kind of tank mates will help in the long run. No beginner can afford frequent conflicts among fish. Not only that, incompatible tank mates can turn a healthy fish into a stressed one.

Severum Cichlids are peaceful. But they habitually love colonizing the entire tank. You can prevent this by creating necessary barriers within the tank without curtailing their land and freedom to roam around.

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For a Severum Cichlid tank, you should look for medium or larger mellow fish species that can make compatible tank mates.

Here’s a list of some of the best species to consider.

• Barbs
• Angelfish
• Blue Acara
• Catfish
• Pearl Cichlid
• Blue Gouramis
• Gold Gourami
• Moonlight Gouramis
• Flag Cichlid
• Blood Parrot Cichlid
• Loaches
• Silver Dollars
• Oscar Fish (most cases)
• Pleco Fish
• Silver Dollars

Poor Tank Mates

Avoid larger and more aggressive fish species to pair up with Severum Cichlids. These aggressive tank mates should never be kept in the same tank as your Severum Cichlid.

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Unlike other Cichlid species, Severum Cichlids don’t realize they have the ability to defend themselves. Avoid these other species when it comes to Banded Cichlid tank mates:

• All large New World Cichlid species
• Small Gouramis like Dwarf and Honey Gouramis
• Freshwater Shrimp
• Aquarium Snails

Breeding

Breeding Cichlids is a wonderful experience as these fish will breed in pairs and will care for their fry. In order to pull it off, you will need to start up with several juvenile fish – at least to start out. They will need to grow up together until you see a couple pair up. That is your sign that a breeding pair is forming

However, these Severum Cichlids are selective about who they decided to breed with. Keep them together and hope that they bond. It will take up to 6 months for cichlids to go from juveniles to forming as a pair. You will need to be patient and understand that this takes time.

Once you have a breed, it’s time to set up the environment. Here is what you need to do:

1. Obtain a separate tank to use for breeding the pair.
2. Set the temperature higher – 78 – 81 degrees F to be exact
3. Keep plenty of decor and hiding plants for comfort
4. Feed the fish a well-balanced diet. A healthy fish will actively breed, so diet is key

Once the pair do their thing, the eggs will hatch in about a week. Both parents will watch over the eggs and raise the fry together. Work with crushed flake food to feed the fry or use enriched hatch brine shrimp.

Food and Diet

The Severum Banded Cichlid is an omnivore. They are hardly picky and, therefore, will feast on anything you drop in their tank.

To spice up their menu, feel free to go for high-quality herbivore and carnivore flakes.

You can also feed them pellets, micro worms, earthworms, bloodworms, marine crustaceans, white mosquito larvae, brine shrimp, green vegetables, and even fruit.

Don’t feed your pet beef heart or liver as they have fragile digestive systems and can fall ill from it.

Common Health Problems

Like any other fish, Common Severum Cichlid species can also fall prey to different diseases. You should always keep an eye out for common symptoms so that you can treat them on time.

Here are some common diseases Severum Cichlids are susceptible to.

Head and Lateral Line Erosion (HLLE)

This disease is common in fish species raised in tanks with poor water quality. Other common reasons is over-filtration with toxic chemicals, stress, vitamin deficiency, and poor diet.

The most common symptom of this disease is a hole in the head of the fish

It begins as small pits of receding skin around the fish’s head and lateral line and sometimes occurs on the unpaired fins. To treat this, simply isolate your pet, get water conditions fixed and supplement its diet with vitamin C, calcium, and phosphorus.

Ich

Ich is a very common fish disease. The presence of an external protozoan parasite causes this infection.

Some common symptoms are:

• Multiple small white spots on the fish’s body and gills
• Frequent scrapping of the body against hard objects
• Abnormal behavior

FAQs

South American Cichlid Species Directory

This article is part of our South American Cichlids: Complete A-Z Species Directory. Visit the hub page to explore care guides for all 32 South American cichlid species we cover.

What It Is Actually Like Living With Severum Cichlid

This is the part no other care guide gives you. Forget water parameters for a minute. Here is what it is actually like to share your tank with this species.

They are gentle giants. For a fish that reaches 8 inches, severums are remarkably docile. They coexist with smaller fish like tetras and corydoras without issues, as long as the tank mates are too big to fit in their mouth.

They have moods. Severums change color based on mood and stress level. A happy, dominant severum shows vivid bars and bright colors. A stressed one fades to a pale, washed-out version of itself.

Plant destruction is real. I cannot overstate this. If you put delicate stem plants in a severum tank, they will be eaten. Use java fern, anubias, and bolbitis. Everything else is at risk.

They pair bond for life. Severums form strong pair bonds and will breed repeatedly once established. The courtship behavior is fascinating to watch, and both parents participate in guarding the eggs and fry.

How the Severum Cichlid Compares to Similar Species

The obvious comparison is discus, and I’ll be direct: severums are the better choice for 90% of fishkeepers. Discus need pristine water quality, temperatures above 82°F, soft acidic water, and a carefully controlled diet. Severums thrive in a much wider range of conditions. Standard tropical temperatures, moderate pH, and they’ll eat practically anything. Discus are more visually refined and come in more color varieties, but severums offer 80% of the visual impact with about 20% of the difficulty. The main downside of severums compared to discus is aggression. Severums will hold their own in a community, which discus won’t.

The uaru cichlid is a less common but worthwhile comparison. Uarus are similar in size and shape to severums but are calmer and more social. Both are herbivorous grazers that will destroy plants. Uarus are rarer in the hobby and harder to find, but if you can source them, they offer a gentler temperament with similar care requirements.

Closing Thoughts

Severums are the discus you can actually keep without losing sleep.

I hope you learned a lot about Severums from our article. They are an underrated fish, and in my opinion, the label of poor person’s cichlid doesn’t jive well with me. They stand on their own in an aquarium and make a settler showcase fish. Their gentle nature makes them one of the rare large fish that will tolerate tank mates and is hardy. Give them a chance, and they will shine and give you many years of joy.

Have you kept Severums in the past? Let us know in the comments. Until next time!

Eel reproduction is one of those topics where the more you dig in, the stranger and more fascinating it gets. I’ve kept eels in my saltwater tanks over the years, and even knowing the basic life history, it’s remarkable that despite centuries of scientific study, nobody has ever observed a European eel spawn in the wild. not once. The Sargasso Sea is where it’s believed to happen, but we’re still largely working from indirect evidence.

This isn’t just an academic curiosity. It has real implications for eel conservation, and it helps explain some strange behaviors you’ll notice in eel species kept in the aquarium trade. Here’s what science actually knows, what it doesn’t, and why the eel reproduction question has stumped researchers for as long as it has.

What Are Eels?

If you’re not familiar at all with eels, then they’ll initially look otherworldly. Are they fish? Are they snakes? Or are they something new altogether?

Don’t be fooled, these are actually thin, almost finless fish that belong to the Anguilliformes order. Within this scientific order are 8 suborders and almost 800 species! Both saltwater and freshwater eels belong to this scientific order, though not every fish that’s labeled as an ‘eel’ is a true eel!

If you are familiar with eels at all, then you may have heard of the electric eel (Electrophorus spp.) which is capable of delivering a deadly shock. While these fish certainly look like true eels, they are actually more closely related to knife fish as members of the Gymnotiformes order.

Although freshwater eels and saltwater eels look very different from each other and their related genera, there are a few defining features that make them true eels of the Anguilliformes order.

Anguilliformes are ray-finned fish. But unlike other fish, eels lack pelvic fins entirely and most species don’t have pectoral fins. Eels also have a conjoined dorsal and anal fin that makes a singular, long fin that extends across the latter half of their body. Interestingly, this evolution also allows these fish to swim backward. Another defining feature of eels is that some species have small scales while others have incorporated scales into their skin. Some may lack scales entirely.

Anglers and other eel-handlers especially note their ability to produce slime, which is a defense mechanism against predators and pathogens. Eels have sharp teeth fixed in their mouths, with some species having a second jaw known as the pharyngeal jaw. The first set of jaws is thought to specialize in catching the prey while the second set processes the food and moves it along to the digestive tract.

True eels can be found in freshwater and marine ecosystems around the world. Some species are catadromous which means that they migrate from one body of water to another. As we’ll see, some species of eel, especially those in the Anguillidae family, make extensive journeys from freshwater ecosystems to purely saltwater conditions.

An example of a true eel is the European freshwater eel. This species of freshwater eel lacks scales and breathes through its skin. This unique ability makes them able to survive out of water for up to 48 hours! European freshwater eels can also bury themselves and hibernate in the mud over the winter months; this is also needed when their natural habitats dry out over the summer.

Where Do They Come From?

Fish have been around for a long time which means that they’ve been studied for a long time. So much so that even ancient Greek philosophers devoted their entire lives to understanding their origins, especially the beginnings of eels and their reproductive processes. Surprisingly, the great Aristotle contributed much thought to these lifecycles.

According to Aristotle, eels materialized from mud and were actually a type of earthworm. This became a popular theory as no one had ever seen eels reproduce and there was no other reasonable explanation; this also eliminated the need to explain their apparent absence of reproductive organs.

It’s hard to believe that this exact explanation for eel reproduction persisted for over 2,000 years, but few dared to challenge the findings of Aristotle.

It wasn’t until Pliny the Edler, a Roman naturalist and natural philosopher, theorized another answer to eel reproduction. He believed that new eels were born from the old shed skins of parent eels that scratched themselves on hard surfaces, like on the seafloor and on rocks. Each scraping would turn into a new eel.

Other popular beliefs included eels being born from sea foam or from when sunlight reflected off the surface of the water in just the right way. Some even thought that eels hatched on the rooftops of great buildings or derived from the gills of other fish. The more absurd theories mentioned the involvement of beetles and hair from horses falling into the river.

Many centuries later, famous psychoanalyst Sigmund Freud took a stab at uncovering the mystery of eel reproduction. In 1876, while a medical student at the University of Vienna, Freud bought as many eels as possible. After 400 dissections, Freud finally located the male eel’s gonads deep within the abdominal cavity, dispelling any previous theories!

Geography

This was a major breakthrough in understanding eel reproduction and their lifecycle.

You might be saying to yourself that you’ve never actually seen an eel in the wild. This isn’t because eels aren’t abundant, but rather because they’re reclusive and nocturnal.

When not migrating thousands of miles, these fish like to stay as elusive as possible, cramming themselves into tight caves and rock formations, burying themselves in the substrate, or even living together in communities known as eel pits.

In freshwater ecosystems, they can be found on nearly every continent excluding Antarctica in rivers, lakes, streams, and even ponds. Keep in mind that some eels are able to move across land, allowing them to enter isolated areas of water. Marine eels have a much larger range and can be found in most regions of the ocean at varying depths.

How Do They Reproduce?

The long-asked and long-evaded question: how do eels reproduce? Even today, after thousands of theories and anatomical dissections, there are many unknowns about the lives of eels.

To help understand how eels reproduce, we need to first look at the 5 incredibly complex stages of an eel’s life cycle.

5 Stages Of Their Life Cycle

The lifecycle of an eel is divided into 5 distinct stages. Each one marks different biological and sexual maturity levels of the eel. Most notably, sex organs develop in the later stages.

1. Larvae
2. Glass Eel
3. Elver
4. Yellow Eel
5. Silver Eel

You can see an illustration of the life cycle in the photo below (Wikipedia photo source)

The Larvae

The first stage of an eel’s lifecycle is the larval stage, individually known as leptocephalus. In this phase, the baby eel emerges from its fertilized egg in or near its species’ breeding grounds.

Leptocephalus are largely transparent. They have radically compressed bodies with minimal muscles and organs. One of their most defining features is a simple stripe that runs down the middle of their pane-like body. During the next metamorphosis period from larva to glass eel, the transparent gel changes into solid adult tissue.

Interestingly, leptocephali feed on marine snow and other organic matter to facilitate growth. They are largely planktonic and depend on ocean currents to get them to where they need to go, mostly estuaries and other safe coastal ecosystems. Once in an intertidal region, they begin their transformation into glass eels.

Glass

The transformation from leptocephalus to glass eel is both a geographical and physical change. As leptocephali, eel larvae live in the ocean. As they begin their metamorphosis into glass eels, they must make their way into protected estuaries where freshwater and saltwater ecosystems mix. This is a challenging move and many eels do not survive due to their lack of control over their navigation.

Physically, leptocephali start to change into more recognizable glass eels. One of the major changes during this life stage is the development of pigmentation which takes over the previous clear gel. But underneath their skin, there is another major change happening.

A regular fish’s body needs to osmotically adapt to changes in salinity, like the differences between freshwater and saltwater conditions; typically, when marine fish enter brackish water, their cells begin to swell as there is a difference in osmotic pressure. Eels have evolved to combat this problem with specialized kidneys that are able to retain more salt to better match their internal salinity to their external salinity.

Elvers

The next stage of an eel’s life cycle is the elver stage. This is the pre-adult stage that occurs once the eel is about 2 to 3 years old. The elver will have dark yellow pigmentation and reach up to 8 inches in length. If they’ve not already made their way upstream to freshwater rivers and streams, then young elvers will begin their journey.

At this point, the eels are omnivores and will try to eat anything they can fit into their mouth. This largely includes crustaceans, worms, and insects. Elvers and the next lifecycle, yellow eels, can stay in these freshwater upstream regions of rivers for up to 20 years until they are mature enough to migrate back out to the ocean. Many eel species return to the Sargasso Sea to spawn, though this varies by species.

Sadly, elvers are a very popular dish that has caused issues with eel sustainability in the past.

Yellow

Before becoming a silver eel, or an adult eel, elvers must first become a yellow eel. This is when the pigmentation turns even darker and their true adult colors start to form, including brown, olive green, yellow, and black. These colors will largely depend on environmental factors, such as temperature and turbidity. At this point, juvenile eels can measure over 30 inches in length.

Yellow eels will continue to live in and move from one freshwater ecosystem to the next until they’re ready to transform into their final life stage, the silver eel.

Silver or Adult

Believe it or not, not much is known about adult eels, also known as silver eels. Scientists aren’t sure what determines when eels transition into their final form. This is even more complicated by being unable to tell how old an eel is by its appearance alone at this point. One thing is understood though, eels aren’t considered fully mature until they develop sex organs in the last stage of their life cycle as an adult eel.

As adult eels, males can reach 2 feet in length while females can grow up to 4 or more feet. They change drastically in color from dark natural colors to steel silver. Only as adults is when eels are mature enough to make the trip to the Sargasso Sea or other spawning grounds depending on the species.

How Do They Mate In The Wild

When talking about eel reproduction, you’ll often hear about the Sargasso Sea. The Sargasso Sea encompasses Bermuda (including the infamous Bermuda Triangle), the Azores, and the West Indies. This area of the Atlantic Ocean is a 2-million-square-mile span of saltwater that is home to the breeding grounds of millions of eels. Most notably, freshwater European and American eels make this thousand-mile journey.

When male and female eels arrive at their specific breeding grounds, it is believed that eels reproduce through external fertilization. This means that the females release millions of eggs that then get fertilized by the males’ sperm. Sadly, the adult eels die soon after. The eggs then get fertilized and repeat the previous lifecycles, making their way back to North America and Europe respectively. Other species of eel have different, yet still specific breeding grounds.

Different Types

Remember, there are 800 species of known eel around the world! Imagine how many there are undiscovered if scientists couldn’t even identify their sexual organs for thousands of years.

The truth is that a lot is still unknown about eels and new species are still being discovered. Even the species that we have documented are not fully understood.

Here are some of the most well-known species of freshwater eel.

European

The European eel is a common type of freshwater eel that can live to be 85 years old in the wild and 55 years old in captivity! Unfortunately, they are listed as a critically endangered species due to overfishing, parasites, and other human activity.

These fish feature a pair of small pectoral fins and have the typical snake-like body. They grow to between 2 to 3 feet in length. As catadromous fish, European eels spend their adult lives in freshwater rivers and streams throughout much of Europe and migrate to saltwater conditions to reproduce. This particular species travels to the Sargasso Sea in the Atlantic Ocean.

Interestingly, European eels don’t stop traveling upstream until they’re sexually mature. They’ve been found in seasonal ecosystems that dry up over hot months and in isolated lakes and ponds, confirming their ability to travel over land and to survive for extended periods buried in the substrate.

Many breeding programs have been installed to help declining numbers of the European eel with slight success using hormones and controlled conditions.

Shortfin and Longfin

Two more common types of eels originate from New Zealand: the longfin eel (Anguilla dieffenbachii) and the shortfin eel (Anguilla australis). The longfin eel is endangered while the shortfin eel is near threatened.

Like European eels, longfin and shortfin eels can live for a considerably long time. They are found in freshwater streams and lakes and make their way to regions in the Pacific Ocean for spawning. Longfin eels are found further inland in New Zealand than shortfin eels, but shortfin eels can also be found in several other countries across the South Pacific.

These two fish also have different breeding grounds. Longfin eels travel to areas near Tonga while shortfin eels migrate to deep waters around New Caledonia. Every female can produce up to 20 million eggs!

Longfin eels are aptly named for their lengthy fins. Their dorsal fin is almost two-thirds the length of their body. Shortfin eels have a similar appearance but have a fin that starts farther away from the head. Another difference is that when a longfin eel bends, wrinkles form on its skin; a shortfin eel’s skin will remain smooth. Females are notably larger and live longer than males.

Japanese

Japanese eels (Anguilla japonica) are mainly found in Japan, Korea, China, and Vietnam. Like the other types of eel on this list, Japanese eels also spawn in the sea but spend a large majority of their lives in freshwater.

When the time comes, Japanese eels travel to the North Equatorial Current in the western North Pacific. Throughout this long journey, Japanese eels do not eat. Instead, they collect all the nutrients they need through a specialized oil before making the trip.

These fish feature a dull grey, brown, and greenish dorsal on top of a white underbelly, though these colors depend on environmental factors.

Sadly, Japanese eel populations are decreasing due to changing ocean temperatures, habitat loss, and fluctuating salinities. Japenese eels are also a popular culinary dish, popularly known as unagi, though regulations have been implemented to reduce overharvesting and to encourage supplementation. As a result, they are listed as an endangered species.

The African Longfin

The African longfin eel (Anguilla mossambica) is another common type of eel, though not much is known about them. They have olive, gray, and black bodies with a light underside. They prefer fast currents in the western Indian Ocean off of Africa.

They eat a variety of fish and invertebrates, but will also scavenge.

Difference Between Freshwater and Saltwater

There are freshwater eels and there are saltwater eels, but most freshwater eels spend some time in saltwater conditions. Where marine eels live in the ocean can vary, with some preferring coastal lagoons and others enjoying the open sea. Some species even dig into the mud and sand.

The major difference between freshwater and saltwater eels is body texture and appearance. Freshwater eels have a firmer texture, while saltwater eels are softer and leaner. Most saltwater eels are also much more colorful than freshwater eels, making them a very popular addition to the marine aquarium.

For the adventurous eel connoisseur, freshwater and marine species also have different tastes.

How Do They Survive Migration?

You might be wondering how eels survive for thousands of miles as they transition from freshwater to saltwater. What do they eat? When do they sleep? How do they know where to go?

In fact, most eels don’t eat on their way to their final destination. In most cases, their stomach deteriorates. The blood vessels around the swim bladder increase for additional support while swimming. Their eyes also double in size, which increases sensitivity to blue waves of light, increasing their ability to see in the dark. Their kidneys also adapt to hold more salt to increase internal salinity levels to compensate for their surrounding salinity changes.

European eel migration is one of the longest migrations documented by any marine creature. They typically start their migration in autumn and arrive at the Sargasso Sea in late winter and spring. This journey is approximately 3,000 miles long and can range from 80 to 170 days.

It is believed that eels use every sense they have to navigate their journey. It’s also strongly believed that they rely on lunar cycles and wait for the perfect conditions in regard to temperature, salinity, tides, and currents, to make their move.

What About Captivity?

Because of their complex lifecycles, eels have not been bred in the home aquarium. Many researchers and hobbyists have attempted artificial breeding, but nothing can replicate the years spent in freshwater, transition to saltwater, and external fertilization.No one has ever seen captive eels breeding in a home aquarium. They have a complex life cycle, and their sexual organs only develop at the last stage. Also, they spend months and years traveling to the spawning ground present in the Sargasso Sea, where once eel eggs and sperm are realized, the fish die. Those free-floating eggs get externally fertilized.

That isn’t to say that researchers aren’t close, though. In fact, some species of eel have been successfully bred in closely monitored systems with the help of hormones and fluctuating parameters. However, the full lifecycle of an eel has never been achieved in captivity.Many people tried different artificial ways to breed mature eels in a home aquarium but to no avail.

Their Lifespan

Eels are very hard to kill. They are built to withstand extreme differences in environmental conditions and have a very long lifespan. Their blood is poisonous and they have been known to swim for hours on end even with their head cut off.

However, any traces of toxic ammonia, nitrite, or nitrate in the aquarium can cause your freshwater or saltwater eel to succumb to unfavorable environmental factors.

FAQs

Closing Thoughts

Eels are some of the most complex aquatic creatures but you wouldn’t know that from their simple snake-like appearance. For years, it was impossible to know the complex life stages these fish go through while transitioning from freshwater to saltwater. While we’re still not exactly sure how eels go through these stages and make their migrations, we will make those dissections over time.

Do you have any theories about how eels reproduce? Let us know your thoughts below! Let us know your thoughts below! Subscribe to our YouTube channel for more crazy videos.