In the fish world, there is such a kind of fish. They are naturally like fighting. You can always see them chasing and fighting, and even fighting with each other. Because of this habit, they have a name - "fighting fish". As a kind, why do fighting fish like fighting so much?
Bettas are common in fresh water in Asia and Africa. Most species of male fish can build, protect and maintain a floating nest composed of mucous bubbles, and are often called "nesting fish". There are about 70 species of Betta, some of which are often kept in aquariums because they are suitable for viewing. To explain their aggressive behavior, we have to start with their courtship and mating behavior.
Betta has very strict requirements for its spouse. We must be happy with each other and cooperate with each other in order to successfully mate. If one of them is unhappy, or there is a difference in body shape, it will lead to serious consequences: at least, they cannot mate successfully, and at worst, they may lose both sides or even die. Therefore, when Betta mating, both sides should be similar in shape. The male should not be too big or too small. The most appropriate thing is to be slightly smaller than the female, so that the female will not be killed by the fierce attack of the male during mating.
During the breeding period, the male fish will experience the "marriage color" that is not usually seen, and use this bright color to attract the attention of the opposite sex. In the process of courtship, the body color of male fish will become particularly bright, and the body and fins will appear iridescent gorgeous colors. If the female doesn't respond to the male's courtship, the male will become angry and chase the female until it is forced to jump out of the water.
The fight between the same sex is more fierce. Sometimes two males will fight with each other in order to compete for a female until one side is defeated or even dies. It is this natural selection of survival of the fittest that leads to the nature of fighting fish.