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bull trout
The bull trout (''Salvelinus confluentus'') is a char of the family Salmonidae native to northwestern North America. Historically, ''S. confluentus'' has been known as the "Dolly Varden" (''S. malma''), but was reclassified as a separate species in 1980.〔(U.S. Fish and Wildlife Service Bull Trout Facts )〕 Bull trout are listed as a threatened species under the U.S. Endangered Species Act (1998)〔(【引用サイトリンク】title=Species Profile-Bull trout (''Salvelinus confluentus'') )〕 and as vulnerable on the IUCN Red List of Threatened Species.
==Description==
Like other species of char, the fins of a bull trout have white leading edges. Its head and mouth are unusually large for salmonids, giving it its name. Bull trout have been recorded measuring up to in length and weighing .〔 Bull trout may be either migratory, moving throughout large river systems, lakes, and the ocean, or they may be resident, remaining in the same stream their entire lives.〔 Migratory bull trout are typically much larger than resident bull trout, which rarely exceed .〔 Bull trout can be differentiated from brook trout (''S. fontinalis'') by the absence of distinct spots on the dorsal fin, as well as yellow, orange, or salmon-colored spots on the back as opposed to red spots with blue halos on the brook trout. Bull trout lack the deeply forked tail fin of lake trout (''S. namaycush'', another char).〔
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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