The causal relationship between fish feeding behavior and evolution

Fish face interspecific and intraspecific competition during the feeding process. Different species in the same habitat often feed on different objects to avoid competition. In addition, predators also have to deal with the resistance of the prey and defend themselves against attacks by other animals. Since food is generally unevenly distributed, no matter what type of feeding fish, there is a search process during the feeding process. Especially when the prey cannot move or the predator cannot adopt a waiting strategy because it cannot hide, the predator can only take the initiative to attack. Fish hunt in many ways: the predator may swim in search of prey, may lie in wait for prey to approach before attacking, or may drive prey out of hiding in order to prey. Some predators only use one specialized way of hunting, while others have multiple ways of hunting.

Feeding behavior is formed and developed in the process of evolution. Specialized monovorous fish evolved when certain foods were abundant in the environment, while omnivorous fish were selected in areas with variable environmental conditions. As the environment changes, the feeding behavior of fish will also change. In many areas on the earth, especially in temperate zones, the amount of food varies greatly seasonally. Some fish adopt the strategy of seeking food in autumn to accumulate nutrients to survive the winter or hibernate. Some fish with strong mobility adopt the strategy of chasing food, such as the two migration activities of fish in search of food after autumn and in spring. The migration of fish is not only to find food, but also reproductive migration is one of the important activities in the life of fish.

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