The oyster ?
 
The oyster is a bivalvular mollusc (2 asymmetrical valves), lamellibranche (gills in plates), belonging to the command of the filibranches, the sub-order of the anysomyaires and to the family of ostréidés.
This marine, edible mollusc extremely appreciated, is the subject of a commercial breeding, ostreiculture
The oyster saw slept on its hollow valve, which is strongly welded with the supports, lautre valve playing the role of lid. It often lodges a diatom which confers a green hue to him. It plays a importatnt role in precipitation clays in suspension, therefore in the silting ports. The Portuguese oyster, of form lengthened and alive on the surface, tends to quickly supplant the oyster punt, round, alive by 10 m basic.
The oysters are considered harmful for the period of the abrasion (from May to September) when they are consumed on the spot of fishings. Poisoning appears by abdominal pains, nauseas; the allergy is often in question.
 
With the shelter of its shell which is closed like a bolt, it is a true power station of energy!
The two principal varieties of oysters are " Ostrea Edulis " (punt) and there " Crassostrea Gigas " (hollow).
One finds the oyster digs along the littoral and of preference close to a mouth of river or an incision in the coast.
The oyster punt, as for it, prefers deeper water.
 
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