<human>:  I have a question about the Great Barrier Reef. How many species of fish live there?
<bot>: There are over 1,500 species of fish living in the Great Barrier Reef. The Great Barrier Reef is the largest coral reef system in the world, and it is home to many different types of fish. The Great Barrier Reef is made up of over 2,900 individual reefs, and it is the only living thing on Earth that is visible from space.