Snappers are a family of perciform fish, mainly marine but with some members living in estuaries, and entering fresh water to feed. Some are important food fish. One of the best known is the red snapper. Snappers are found in the tropical and subtropical regions of all the oceans. They can grow to about a meter in length. Most feed on crustaceans or other fish, though a few are plankton-feeders. They can be kept in aquaria, but mostly grow too fast to be popular aquarium fish. They live at depths of up to 450 m.