When a fish eats another fish, it doesn’t just swallow it whole. It uses a specialized technique called “gill raking” to tear the prey apart and ingest it.

Fish use gill raking to rip apart their prey in two different ways: they can either use their teeth to tear off chunks of flesh or they can use their gills to rip off pieces of meat. In some cases, they will first use their teeth to take off a chunk of flesh before then using their gills to finish the job.

The reason why fish eat other fish whole is that they don’t have any teeth. They aren’t like us mammals; instead, they have multiple rows of sharp spines along the outer edges of their mouths that work together with the inner edges of their mouths to tear through flesh and bone alike.

Do you wonder what fish eat other fish? You can read more about them in our article on Betta fish, Black swallowers, Piranha, and Characin. These creatures can be quite cocky and may swallow another fish whole. Once they’ve swallowed another fish, the entrails are not digested and start decomposing. The gas released during this process causes the fish to float to the surface.

Betta fish

The male Betta fish is known as a fighter, and if you mix it with other male Bettas, you’ll see a lot of fights. In large tanks, male Bettas will fight each other, often to the death. After the fight, they’ll die from their wounds.

If you’re unsure if your betta will get along with another fish species, try introducing him to at least five fish at a time. This will help you determine if he’ll get along with the other fish in your tank. You can also try adding shrimp to the tank to see if he will eat them. Ghost shrimp and cherry shrimp are good choices for betta tank mates.

Another common misconception is that betta fish are predatory and will hunt other fish in the aquarium. While some of these predators are not harmful to bettas, it’s possible they could cause harm to a betta if it accidentally eats them. Fortunately, bettas are quite timid when it comes to eating other fish.

A good alternative is freeze-dried foods. These can be made at home or bought from an aquarium store. However, it’s important to keep in mind that frozen foods may contain a lot of bacteria and parasites that your betta might contract. Moreover, freeze-dried food may cause constipation and other digestive problems. Therefore, it’s a good idea to give your betta fish a multivitamin beforehand.

Black swallowers

Black swallowers are a type of fish that live deep in the ocean. These fish have very sharp teeth, so they are not recommended for aquariums, nor do they make good pets. They are members of the Percomorpha family of fish, which also includes scorpionfish and anglerfish.

Black swallowers are predators that feed in the deep ocean. They are able to locate their prey in the dark and swallow them whole. They have long pectoral fins, which are relatively large, and small pelvic fins. They also have two dorsal fins, the first of which has twelve spines. The second fin has only one spine. Their anal fin is covered in 28 soft rays.

The mouth of a black swallower is huge and it can swallow fish with twice as much mass as it is long. The fish does not chew their prey, but instead moves its jaw over the prey’s body, coiled up inside the stomach. Black swallowers can eat very large prey because their stomach tissues can stretch to near transparency.

Black swallowers are very greedy. They can easily swallow larger fish, but if they become overly ambitious, they swallow a large fish. The fish then begins to decompose, which causes the stomach to burst and force the fish to the surface. This allows scientists to study the dead black swallower and what it ate. In one study, a black swallower ate an 86-cm-long snake mackerel.


Piranhas have a reputation for crushing other fish, and their teeth are very sharp. In fact, piranhas were already attacking fish 150 million years ago. Their sharp teeth were used for the same purpose – to rip off chunks of flesh and fins from their prey.

Piranhas are diurnal, opportunistic carnivores that feed on both plants and meat. Their diet varies depending on the size of the fish and the type of prey available. Most commonly, they eat smaller fish, but they will also attack large fish if they find them in schools. Their feeding habits depend on the time of day, the temperature, and the availability of food. Piranhas feed communally, so a scarcity of food may trigger feeding frenzies.

Piranhas feed on the scales and fins of other fish, as well as dead fish. While they do not attack humans, they may attack live fish and animals up to the size of a chicken. Although they can’t break apart live animals, they can decapitate a human in a matter of minutes. If a piranha does catch a human, it may bite its victim until they are dead. In other cases, they may attack a swimmer, but only if they’re desperate for sustenance.

Although piranhas can be shy around humans, they will stop hiding when they see a human. If they feel threatened, they will become more aggressive and may even bite the human. The reason they are so fearful of humans is that they perceive humans as potential meal crumbs. They are voracious feeders and will go into a feeding frenzy as soon as they see meaty foods in the water. A healthy diet can improve your fish’s health and longevity.


Characin is a protein found in some fish that helps them eat another fish whole. These fish are similar to piranhas. These blunt-faced predators butt their faces into their prey and suck their scales off. These predators have an extensive digestive system and a highly efficient method of killing prey.

Scale-eating fish

Scale-eating fish are a diverse group of creatures that feed on other fish’s scales. While the feeding habits of different species vary, they have many common traits. Biologists from the University of Washington’s Friday Harbor Laboratories have been studying these species to learn more about their habits. Their research has recently been published in the Royal Society Open Science journal.

In our laboratory study, we observed that juvenile P. microlepis initially attacked their prey from both sides, but gradually shifted their attacks to the side where their mouth opened. We also observed that the stomach contents of early juveniles and adults included scales from both sides of the prey, but that the contents of the stomach of adults were almost entirely from one side. These findings indicate that lateralized attack behavior is not inherited, but is learned.

We also found that scale-eating fish in dimorphic habitats had an increased probability of successfully attacking their prey. This was seen in populations of righty scale-eaters and lefty scale-eating fish. This increased probability of attacks may be a consequence of negative frequency-dependent selection.

In our laboratory, we found that both lateralities of scale-eating fish were important in determining which fish was more likely to be successful during treatment. We observed that the opposite predation mode was more common in adult males. This suggests that these fish prefer to attack the scales of their prey rather than the scales of the females.

Taking bites out of tank mates

If your fish are taking bites out of your tank mates, it could be a sign that they are stressed. If this happens, you should check the parameters of your tank and move them if necessary. If you have a large tank, experiment with tankmates to find out which ones work well together.

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