Oyster Essay

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Oyster from the phylum of Mollusca in class Bivalvia. They are live mainly in intertidal zone. This species are commonly consumed, cooked or raw, by human as a food. However, some kinds of pearl oysters are harvested for the pearl produced within the mantel. Besides, the are highly calcified and many of them are irregular in shape.
Oysters are filter feeders. This species may remove organic particles and the plankton from the water column in order to improve the water quality and clarity. As the filter feeder, they will draw water in over their gills through the beating of cilia. After they draw the water, all the suspended plankton and particles that are trapped in the mucus of a gill then being transported transported to the mouth. The process
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Their mantel are lined with thin and small walled blood vessels through the gills. Besides, they have a small three-chambered heart that lying under the adductor muscle. This chamber will pumps colorless blood to all parts of the body. In the other hand,the waste product also being remove from the blood by the two kidneys, located on the underside of the muscle.
For reproductive process, most of their reproductive organs contain both eggs and sperm. So, it is possible for the oyster to fertilise its own egg. Their reproductive process started when the the female is fertilised. Millions of eggs will be discharges by the female in the water. In about six hours, the larvae will be develop and they will continue to swim around in two or three weeks more. The process followed the settle down of the larvae on the bed until mature within a year. In addition, their gonad are made up of sex cells, branching tubules, and connective tissue and also surrounded by the digestive system.
Besides, they also have the hard structure of shells. This special structure are very useful as the habitat for the other marine organism such as sea anemones, barnacles, and hooked mussels. Many of this small marine organisms are the prey to fish and the others larger

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