Most of these reefs are in the Indian and Pacific oceans and around the West Indies. A reef's clear, sunlit waters swarm with fish that dart in and out of the coral. Many of them are among the most beautiful in the world.
Reef fish differ greatly in appearance and in many other ways.
For example, some are mainly plant eaters, such as parrotfish and surgeonfish. Others, including triggerfish and trunkfish, eat small water animals as well as plants. Still others are predators that hunt smaller fish. Such fish include groupers and moray eels.