Seaweeds and hard coralline algae grow on the reefs, but are continuously eaten by various herbivores. As well as the many types of coral, there are various shells, starfish, crustaceans and worms inhabiting the reef. There are more than 700 species of fish in the Indian Ocean, and these can be divided into two types: reef fish, which live inside the atoll lagoons, on and around coral-reef structures; and pelagics, which live in the open sea, but may come close to the atolls or into channels for food. These include some large animals, such as turdes and cetaceans, which are very popular with divers.
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