Corals are marine plants and animals from the class Anthozoa and live as small sea anemone-like polyps, typically in colonies of many other identical individuals. The group includes the important reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton.
Shrimp are swimming decapod crustaceans that are classified in the infraorder Caridea. They are found mainly all over the world in both fresh and salt water. Shrimp are commonly caught and farmed for food. There are many unrelated crustaceans that have the word shrimp in their name. Crustaceans such as the mantis shrimp, and the mysid shrimp, but they belong in the Notostraca group.
Salmon is a common name for many species of fish from the family called Salmonidae. Some of the other fish in this family fall under the name of trout. You can most commonly find salmon swimming in the Atlantic and Pacific Oceans, the Great Lakes and some other land locked areas. Most salmon are anadromous, which means that they are born in fresh water. After they are born they migrate to the ocean and only return to the fresh water to reproduce.