Predatory fish

[2] Creation of marine reserves has been found to restore populations of large predatory fish such as the Serranidae — groupers and sea bass.

[5] Predatory fish such as sharks, billfish, alligator gar and tuna form a part of the human diet and are targeted by fisheries, but they tend to concentrate significant quantities of mercury in their bodies because they are high in the food chain, especially as apex predators, due to biomagnification.

Consequently, the predators and prey will be locked in an evolutionary arms race, each looking to gain the upper hand on the other.

The presence of fish predators play a large role in the size, shape and swimming performance of the Lithobates clamitans tadpoles.

Some predatory fish, such as lamnid sharks, billfishes, tuna, opah and butterfly kingfish, have the ability for cranial endothermy, i.e., the ability to elevate eye and brain temperatures, which helps with vision and neural function during ambient temperature changes.