More than 1,500 species of fish live on the reef. These include the clownfish, red bass, red-throat emperor, and several types of snapper and coral trout. There are at least 330 species of sea squirts (ascidians) on the reef. These vary in size from 1 mm-10 cm in diameter. Between 300-500 species of bryozoans live on the reef system. These are small water animals that look like moss, or