Why do fish flock together?

And of course, not all fish are like that, but you've seen a lot of fish moving around in groups. 

According to the study, about 80 percent of fish species travel in groups. We can also see this in land animals.

 But fish are said to be less intelligent.

 Instead of thinking about it and forming groups, they follow their instincts.

 And the reason they're instinctively driven by a pack is because they have a lot of benefits in survival. 

You can protect yourself from predators first. 

Fish, like land, eat and eat each other.

 But generally, fish don't jump at fish that are bigger than they are.






So the little fish would stick together and make them look like one big fish. It protects against attacks from predators. 

Also, even if predators are aware of it and come to it, then they can just scatter.







According to a study by British biologist William Hamilton in 1971, " The Geometry of Self-seeking Groups, " fish claim the act of grouping is selfish.

 Conceptually speaking, it is the safest of the groups of fish.






 Dangerous are the fish that are most susceptible to attacks from predators outside. 

But since predators can't catch all of the fish in a single attack, some of the fish that are scattered by the attacks may run away.






 It is a survival mode at the expense of a small number of people. 

So in order to increase the survival rate in the fish population, the fish outside will try to keep going in the middle of the pack. 

And as a result, it forms a very dense cluster.

 There are also advantages to reproduction. 

Fish are usually fertilized in vitro. It is a highly infeasible reproduction method, even if the fertilization is successful. 

So when you try to make a change, you make a huge number of modifications. 

Obviously, if you swarm, you have a higher probability of making corrections.







 But because of the habit , it is dangerous to meet a human being who can clean up with a large net at once.

 But with the exception of humans, swarm behavior has the advantage of highly successful breeding. 





 And when you're in a group like this, you also have an advantage in attacks. 

Usually, fish like Gadareung, Jeongemol, tuna, and Barakuda attack in groups.

 The targets are small fish such as anchovies, which are then surrounded and eaten at the same time.







So the reason why they're moving around in groups is because they have a variety of benefits, including defense and offense and reproduction. 

It wasn't just a bunch of people walking around in groups, it was their instinctive survival strategy.







 And if you look at the way the fish moves around in groups, it's very grand. 

So we visit the aquarium to see this. 

But if you look at the way the group moves, it doesn't just move in one direction, it moves in one direction. 

You don't know how a group of fish can move in the same direction since it's directed by anybody?

 This is because of the sideline, which is the sensory apparatus that exists in fish.

 The sideline is located on the sides of the fish's trunk. 

The side lines can detect small movements and vibrations in the water so that you can feel where the fish next to you is going. 


So you can move around in groups at regular intervals without striking each other.