What Aquarium Fish Don’t Have Scales?

Lauren Kiekbusch
What Aquarium Fish Don’t Have Scales-

Along with our environment, we have been evolving since the big bang! As per our need, as per the environmental change, we have changed our body according to that. Fish are no different than that. Along with their environmental changes, they have evolved their scale.  

There are four main kinds of scales and numerous variations of each kind. Placoids, this kind of scale are mainly seen on fish like sharks and rays. Cosmoid type of scale is found in fish like lungfish and some fossil fishes.

Bichirs, bowfins, paddlefishes, gars, and sturgeons are known for the Ganoid type of scales. Most bony fishes have evolved their scales like Cycloid and Ctenoid.

Some flatfish species, such as flounders, sole, etc., have ctenoids on the eyes and cycloids on the blindside. Males have ctenoid scales and females have cycloid scales in some flatfish species.

Now, let us not discuss everything about fish scales here. In this article, we are going to give you an elaboration on the aquarium fish scale. This will also help you to choose fish for your aquarium. Let’s get started.

Also worth reading;

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  3. Aquarium Snail is Dead or Just Sleeping? How to Tell
  4. Goldfish Tank Size: How Many Can You Keep in a Small Fish Tank
Evolution of Fish Scale

Evolution Of Fish Scale

The world is populated by several different fish species. Any of these types of fish For millions of years not much has changed. Others have grown to use various environmental aspects. 

The modern fish scales are implanted in the dermis (and grow out of it and are fully hidden by the epidermis. They evolve as the fish grow – thereby representing a tradition of fish life, in many instances.  Various varieties of fish have evolved various kinds of scales, each type. 

Enables fish to perform well in their climate. The more primitive scales have better protection than sophisticated shapes. For advanced fish, their thinner scales make increased speeds to prevent harm, and maybe the harder yet lighter primitive fish avoid capturing.

Can You Tell Fish Age From The Scale?

Scale pattern experts will tell you not only how old a fish has spawned and whether or not it was critically sick, but also how many years it is. The age of a fish is measured by measuring the annuli or the year points.

There may be no simple seasonal distinction between circuits on certain cycloid sizes, such as those on the trout. For example, in the sampled region a 12″ rainbow trout were at least four years old, but some fish in wealthier waters were up to age 2.

What Aquarium Fish Don't Have Scales
Texture of freshwater fish scales. Selective focus.

Do Fish Lose Their Scale?

It’s abnormal to lose the scales of a fish. In the number of cases, yes. They will usually grow back if your fish lose any more scales. This appears often as they drop scales due to the infectious disease protrusion. But once your fish get well again the scales can get bigger and bigger. 

Fish should be smooth, lying flat and unbroken against the body. Size loss may result from physical harm if the fish bumps or rough manipulations, parasites, problems with water quality, or skin infections. There will be more symptoms, such as a reddened patch if an infection happens.

The Aquarium Fish Without Scale

According to personal choice, the choice of your fish for the aquarium may vary. But one thing you should keep in mind is that scaled and unscaled fish should not be in the same tank.

They both have their habitat. In large oceans or lakes, they might seem living to share the same spot. But believe me, we humans can not replicate the same ecosystem nature has provided. Keeping that in mind, these fish you can have in your aquarium that has no scale; 

1. The Gigantic Moray Eel

The largest eel type is the Moray eel. In new coastal and brackish waters, there are 200 separate species of moray ants.

Moray eels enjoy colder water and frequently find themselves in the deeper water and the vicinity of coral reefs. And if moray eels are fished commercially, they are not endangered. 

Morays can be preserved in a coral aquarium, but the rest of the animals consume smaller fishes and decorative shells. More people are knocking off reef systems daily, and unattached corals may damage the invertebrate. This happens particularly to morays who get harder when they are fed.

Moray eels like to consume frozen food because you have a lot of money to spend in finding the right diet for this fish. Foods such as tuna, shrimp, lobster, and pulses are important to keep healthy. 

A 30-inch moor will rotate in an 18-inch space but it would probably love being wider. You need a decent amount of water in a big tank because you weigh in the voluminous waste. Although smaller species will do this in an aquarium of 75 gallons, larger morays need a tank of 125 gallons or larger tanks.

2. The Famous Electric Rays

Electric rays, which include stingrays, skates, guitarfish, and sawfish, belong to the superorder Batoidea. Every living creating electricity, even human electricity, but electric rays have two particular kidney-formed organs that manufacture electricity like a battery and store it.

60 electric ray species are categorized into 12 genera and two families. 

It is present in warm and temperate waters all over the world. Many types of electrical rays are present. The bulk of the species live on low water, but some of them live at 1,000 m depths and beyond. Dwellers, electrical rays, and traveling bottoms feed on fish and invertebrates. 

Rays are not recommended as animals for beginners or novices as a predatory and incredibly large developing fish genus. Trying to preserve rays is just an activity that seasoned Aquarians can carry out after thorough study. Rays are a large community of shark-related fish.

Unfortunately, electric rays are not well captive due to their selective feeding habits. They feed mostly on annelid wild and captive worms so the chances of holding the electrical ray alive are slight if you don’t have access to a ready supply of them. 

In the selection of the electric ray, prevent those that do not wish to be buried or fed with curled disk margins or pale dorsal coloring. In captive specimens, parasite monogenetic trematodes that infest the gills are also affected. The affected animal can be dipped into halquinol and formalin for the treatment of these parasites. Do not use copper or trichlorfon drugs on these species.

3. The Diverse Catfish

In nearly every ecological niche in the world, catfish can be found. Few catfish exist in seas, but mainly freshwater fish with more than 2,400 species. Freshwater catfish are some of the most interesting and industrious indoor aquarium fish.

There are several styles, and their scale, needs, and temperament vary considerably. Catfish are typically the most critical members of your fish clean-up crew. 

Meat-eaters are catfish. Its diet primarily consists of fish, beetles, worms, frogs, and novelties. Catfish are residents of the bottom. Cultivated catfish species specialized in eating pellets floating on the water’s surface.

Many catfish prefer to float on the floor of the aquarium and need lots of shelter.  They  Might scavenge and eat almost everything. Many individuals have defensive barbs. They were known to display violent behavior. This conduct, however, normally results in stress and overextension! The catfish has a length of up to 11 inches. In a 30-gallon tank, you’re all right.

4. Sharks

Sharks, they’re misunderstood as briny water mammals. People are terrified by it and can be nice. According to the Natural History Museum, the earliest known “modern” sharks date back 195 million years ago.

There are more than 500 recognized shark species according to the Smithsonian, but many of them are at risk or are in decline due to different causes, such as overfishing. Some can be very tall, up to 18 feet, and the smallest species is just 3 feet in length. 

Many shark species are not suitable for domestic aquaria and each shark species sold by pet shops is not suitable for personal aquaria. In-home saltwater aquariums, some species of sharks can be well preserved.

They grow as big as their ponds, either because they die before puberty or because there is too large a fish in a small tank, they are stunned by insufficient storage space and ineffective chemical equilibrium in water.

For a home aquarium, the Wobbegong is a decent shark – though only if you have those types. Many of this family’s large species will grow to 10 meters long! The wobbegong has also a sluggish metabolism and prefers to hang on the bottom of the tank. It also feeds approximately twice a week, so it is a relatively low pet shark care type.

5. Gorgeous Whiptail Stingray

Whiptail Stingrays are benthic rays that have been submerged with their eyes protruding beneath the sand and mud for a long time. There was a mistake.

Whiptail Stingrays typically live down to 100 or 200 meters of shallow coastlines, while a species can be found at or over 600m. 

The ownership of a kind of freshwater stingray legitimately requires investigating the state in which you live. There are 10 countries in which these animals are unlawful for a human to possess.

The licenses to own a freshwater stingray may be limited for educational purposes only to aquariums, zoos, and research facilities. 

You should learn to feed your mouth. They’re not for everyone who said. They need large aquariums, pristine water temperatures, and expert diets, but they are genuinely unique fish that are rapidly becoming valued pets for people who can put their work into it.

Can Fish Survive Without Scale?

You would also strip the mucus layer covering the fish if you remove the scales. The silk, the feathers, and the scales of the fish are the same as our skin: shielding the species from any pathogen in its environment. 

They are vulnerable to all bacteria, viruses, water debris, and contaminants such as nitrite, ammonia, and nitrate by extracting their scales. Scales are also essential for the control of osmoregulation in saltwater fish. Scales avoid the dehydration of fish by ensuring the right water balance in the fish. 

Technically speaking, a fish would survive without scales during its life if it escaped all the above threats. Still, they do not last that long. It’s like the elimination of the skin.


Scales are a very important part of fish. Of course, you already know, there are also some fish without scales. In this article, we not only listed some famous pet non-scale fish but also elaborately described scales. 

You can have almost every size of fish in your tank according to your tank size. We hope this article will help you very much with the selection of fish that don’t have any scales. 

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