![]() ![]() Most of these species are eaten by larger animals, including fish such as striped bass, black drum, and croakers. Hundreds of sea creatures, such as sea anemones, barnacles, and hooked mussels, live in oyster reefs. The rough surfaces of oyster shells and the nooks between the shells supply spots where a group of small animals can live. ![]() Crassostrea and Saccostrea are found mostly in the intertidal region, while Ostrea is subtidal. As keystone species, oysters serve as homes for a number of marine species.Its mature shape often relies on the type of bottom to which it initially attached, but it always adjusts itself with its outer, flared shell tilted upward. An oyster reef expands the sea bottom’s surface area by 50-fold.The larvae develop after six hours and thrive in water columns as veliger larvae for 14 to 21 days before living on a bed and reaching sexual maturity within a year. After fertilization, females release millions of eggs into the water.While some species of oysters have two sexes, such as the European oyster and Olympia oyster, their sexual organs have both egg and sperm cells which causes these molluscs to fertilize their own eggs.Their nervous system has two pairs of nerve cords and three pairs of ganglia. Two kidneys on the underside of the muscle get rid of waste products from the blood. A small, three-chamber heart below the adductor muscle pumps colorless blood throughout their bodies. Aside from their gills, oysters can also swap gases across their mantles, which are walled with a number of tiny, thin-lined blood vessels.Oysters eat at a lot at temperatures above 10 ☌ (50 ☏).Suspended plankton and particles are stuck in the mucus of a gill, and are moved to the mouth, where they are eaten, digested, and excreted as feces or pseudofeces. Oysters are filter feeders, suctioning water over their gills through the beating of hair-like organelles called cilia.Some of these include (1) thorny oysters in the genus Spondylus, (2) Pilgrim oyster or scallop, (3) saddle oysters or jingle shells of the family Anomiidae, (4) Dimydarian oysters of the family Dimyidae, and (5) Windowpane oysters. Different bivalve molluscs, aside from the true oysters and pearl oysters, have common names that include the term “oyster”, maybe because they either have the same taste or features like that of true oysters, or because they produce noticeable pearls.Different types, colors, and shapes of pearls rely on the natural pigment of nacre, and the shape of the original irritant. In nature, these oysters produce pearls by covering a small invasive object with a composite material called nacre. ![]() ![]() The marine Pinctada maxima is considered the largest pearl-bearing oyster, said to be the size of a dinner plate. Both cultured and natural pearls can be obtained from pearl oysters. Not closely associated with true oysters, pearl oysters are members of the family of feathered oysters (Pteriidae). Some examples of this type include the European flat oyster, eastern oyster, Olympia oyster, Pacific oyster, and the Sydney rock oyster. Members of the family Ostreidae, true oysters have been cultivated as food for more than two millennia and include the edible oysters, which are under the genera Ostrea, Crassostrea, Ostreola, Magallana, and Saccostrea. STUDENTS OYSTER SPAT DOWNLOADSee the fact file below for more information on the oyster or alternatively, you can download our 21-page Oyster worksheet pack to utilise within the classroom or home environment. People either love them or hate them, but little do you know these tasty, slimy, and expensive bivalves offer a number of health benefits. Oyster is the common name given to several families of saltwater bivalve molluscs that thrive in marine or brackish waters. ![]()
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