Order Euphausiidae, Class Malacostraca. This is the largest species of krill, reaching a body length of 6cm. It is shrimp-shaped, with gills protruding from the sides of the carapace. It is found in the Antarctic Ocean, where it is the main food source for baleen whales, fish, squid, and seabirds, and it is estimated that there are hundreds of millions of tons of resources. The eggs laid in the sea mature about two years after hatching, but in summer, when the water temperature rises, as the amount of phytoplankton (→plankton) increases, they filter it out with their thoracic legs and grow rapidly. In recent years, it has also attracted attention as an edible resource. (→Crustaceans, Arthropods, Malacostraca) Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
軟甲綱オキアミ目オキアミ科。オキアミ類中の最大種で,体長 6cmに達する。エビ形をしているが,甲の横から鰓がむき出しになっている。南極海に分布し,ヒゲクジラ類,魚類,イカ類,海鳥類の主餌料で,数億tの資源量があると推定されている。海中に産み出された卵は孵化後約 2年で成熟するが,水温が上昇する夏,植物プランクトン(→プランクトン)が増加するとともに,それらを胸脚でこし取って食べて急速に成長する。近年は食用資源としても注目されている。(→甲殻類,節足動物,軟甲類)
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