Most of them mainly eat plankton and grow up to 10 20 cm in length.

In nature Copadichromis azureus normally eats plankton from the open water.

"And I thought you said they ate plankton."

The fish eat plankton for their first year of life and then become predators of smaller fish.

Some Haemulon eat plankton in the open water, but most seek small prey on the seabed.

The bream eats water plants and plankton as well.

During this stage of their life cycle, they eat plankton, switching to fish once the beak fully develops.

In the wild, salmon are carnivores, eating plankton, prawns and other fish.

Baleen whales eat plankton: clouds of very small things floating in the water.

The largest fish in the world is the whale shark, which is actually harmless because they eat only tiny plankton.