You need to specify who 'they' are.
they eat fish " of kores''
starfish eat it
patagonian toothfish and other types of fish
Different types of small fish eat different types of food. Some smaller fish feed on dead fish while others feed on algae and plankton. There are a variety of foods a fish can eat.
Some types of fish can eat other bigger fish. For examples, piranhas often eat bigger animals including fish.
they can both eat all different types of species of fish.
seals eat cod
They eat fish and fruit
yes, most fish that eat fish flakes eat any type i have over 10 types of fish in a tank and they all eat tetra flakes
seaweed
fish
anything