11. Where Reefs Exist The number of species of corals on a reef declines rapidly in deeper water. Generally, there are about twice as many coral species in Pacific Ocean reefs, such as this Fagatele Bay reef, as in Atlantic Ocean reefs.
12. Where Reefs Exist At least 500 reef-building species are known to exist in the waters of the Indo-Pacific region Atlantic Ocean contains approximately 62 known species
