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lake sturgeon
The lake sturgeon (''Acipenser fulvescens''), also called rock sturgeon,〔(【引用サイトリンク】title=Sturgeons )〕 is a North American temperate freshwater fish, one of about 25 species of sturgeon. Like other sturgeons, this species is an evolutionarily ancient bottom feeder with a partly cartilaginous skeleton, an overall streamlined shape and skin bearing rows of bony plates on its sides and back, resembling an armored torpedo. The fish uses its elongated, spadelike snout to stir up the substrate and sediments on the beds of rivers and lakes while feeding. The lake sturgeon has four purely sensory organs that dangle near its mouth. These organs, called barbels, help the sturgeon to locate bottom-dwelling prey. Lake sturgeons can grow to a relatively large size, topping 7.25 ft (2.2 m) long and weighing over 240 lb (108 kg).〔http://www.lakescientist.com/record-lake-sturgeon-caught-in-wisconsin/〕
==Description==
The lake sturgeon has taste buds on and around its barbels near its rubbery, prehensile lips. It extends its lips to vacuum up soft live food, which it swallows whole due to its lack of teeth. Its diet consists of insect larvae, worms (including leeches), and other small organisms (primarily metazoan) it finds in the mud. Fish are rarely found in its diet and are likely incidental items only, with the possible exception of the invasive round goby.〔http://www.toledoblade.com/StevePollick/2005/06/12/At-last-a-use-for-trashy-Erie-gobies-sturgeon-bait.html〕 Given that it is a large species surviving by feeding on very small species, its feeding ecology has been compared to that of large marine animals, like some whales, which survive by filter-feeding.〔Scott, W.B. and E.J. Crossman. 1972. Freshwater Fisheries of Canada. Fisheries Research Board of Canada, Department of the Environment, Ottawa. p. 87.〕
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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