Giant Clamis the largest living bivalvemollusc. One of a number of large clam species native to the shallow coralreefsof the South Pacific and Indian oceans, they can weigh more than 400 pounds and measure as much as 1.5 meters across.
Sessile in adulthood, the creature's mantletissues act as a habitat for the symbioticsingle-celled dinoflagellatealgae from which it gets it nutrition. By day, the clam spreads out its mantle tissue so that the algae receive the sunlight they need to photosynthesize. Parrotfishare mostly tropical, perciform marine fish of the family Scaridae. Abundant on shallow reefs of the Atlantic, Indian and Pacific Oceans, the parrotfish family contains nine genera and about 80 species. Parrotfish are named for their oral dentition: their numerous teeth are arranged in a tightly packed mosaic on the external surface of the jaw bones, forming a parrot-like beak which is used to rasp algae from coral and other rocky substrates. Many species are also brightly coloured in shades of blue, green, red and yellow. Although they are considered to be herbivores, parrotfish eat a wide variety of organisms that live on coral reefs. Image Source
