Fish survive by eating just about anything , kind of like people . However different types of fish eat different kinds of food . Some fish eat mostly vegetable matter , most fish are Omnivores , which means they eat just about anything , from vegetable matter to other fish , and even terrestrial foods , that aren't from the ocean or water . like insects or even fruit from trees that hang over water . then there are fish that are mostly carnivores , which the majority of thier food consists of meat, or fish .
Do you mean "does not eat"? It depends on the species. Some fish, like the lungfish, may not eat for months, but can easily survive.
Seals eat fish.
The smaller fish eat moss and algae off the rocks to survive, while the bigger fish eat the smaller fish to survive.
eat algae
Blob fish survive by laying on the bottom of the ocean floor and eat anything that floats by!
The tuna is a carnivore. It must eat to survive, and it eats other fish because it cannot eat plants.
the need fish to survive
Many fish are carnivores, which means they eat other animals. They attempt to survive, and to live, they must eat. Many larger fish eat smaller fish as a part of their diet.
They eat fish and small animals.
Goldfish
they eat fish and drink water to survive
so we can have water and we need to survive and also eat fish