eli5: How do fish know where to stay in the ocean? Or all species of fish all together in one big ocean? (e.g do hammerhead sharks and great white sharks stay away from each other or are all of them together and know no boundaries to their “territory”?)

Question

eli5: How do fish know where to stay in the ocean? Or all species of fish all together in one big ocean? (e.g do hammerhead sharks and great white sharks stay away from each other or are all of them together and know no boundaries to their “territory”?)

In: Biology

Answer 1

Temperature, pressure, light, salinity, availability of food-sources, vibration/sound, presence of predators, presence of shelter from predators…

Each species has its own unique combination of preferences for all of the environmental factors above. They go where it feels best for them to be.