Because of the mixture between fresh water and salt water.
Cnidarians are found in marine environments, particularly in coral reefs, rocky shores, and ocean floors. They can also be found in freshwater habitats like lakes and rivers.
Reefs are found in the ocean.
Coral reefs are found in salt water, on the ocean floor. Most often they are found in warm, shallow water.
Sponges primarily live in marine biome, especially in coral reefs and rocky shore environments. They can also be found in freshwater environments, such as rivers and lakes.
The four ocean margin habitats found along the continental shelf are rocky shores, sandy shores, estuaries, and coral reefs. Rocky shores are characterized by intertidal zones with rocks and boulders, while sandy shores have sandy substrates. Estuaries are semi-enclosed coastal bodies of water where freshwater from rivers mixes with saltwater from the ocean. Coral reefs are underwater structures formed by coral polyps and are found in warm, shallow waters.
Pacific and Indian Ocean. Haven't heard of any in the Atlantic
In African fresh water rivers mostly, but some species live in the oceans. The Queen Angelfish (Holocanthus ciliaris) is found the the Tropical areas of the western Atlantic ocean; usually on reefs.
Due to ocean currents
it can be found in the open ocean or reefs like the great barrier reef
The three types of reefs are fringing reefs, barrier reefs, and atolls. Fringing reefs grow close to the shorelines of islands or continents, barrier reefs are separated by a lagoon from the land, and atolls are circular coral reefs surrounding a central lagoon, often found in the open ocean.
lion fishes are mostly found in the regions where coral reefs are present... example... a lots of lion fish found in The great barrier reef.... They can also be found around shallow coral reefs in Asia.
In the Ocean