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Chionoecetes bairdi
''Chionoecetes bairdi'' is a species of crab known alternatively as bairdi crab and tanner crab. ''C. bairdi'' is closely related to ''Chionoecetes opilio'', and it can be difficult to distinguish ''C. opilio'' from ''C. bairdi''. Both species are found in the Bering Sea and are sold commercially under the name "Snow crab". Tanner crabs have suffered from overfishing and as a result strict controls have been placed on tanner crab fisheries.
==Biology==
Tanner crabs are considered a short-tailed or "true" crab. They are decapods with pincer claws on their frontmost pair of legs. They can live over a decade with most adults reaching by the time they reach adulthood, usually after about five years. Females will incubate fertilized eggs for a full year before hatching during spring plankton blooming season. The larvae are at first able to swim, but lose this ability and settle to the bottom after about two months. The tanners' diet consist mostly of other ocean bottom crustaceans, clams and worms. Bottomfish and humans are their main predators. Little is known about their social structure except that the sexes remain mostly separate except during mating season.〔(Wildlife Notebook: Tanner Crab ''Alaska Department of Fish and Game'' )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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