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coho salmon
The coho salmon (''Oncorhynchus kisutch'') is a species of anadromous fish in the salmon family, one of the several species of Pacific salmon. Coho salmon are also known as silver salmon or "silvers". The scientific species name is based on the Russian common name ''kizhuch'' (кижуч).
==Description==
During their ocean phase, coho salmon have silver sides and dark-blue backs. During their spawning phase, their jaws and teeth become hooked. After entering fresh water, they develop bright-red sides, bluish-green heads and backs, dark bellies and dark spots on their backs. Sexually maturing fish develop a light-pink or rose shading along the belly, and the males may show a slight arching of the back. Mature adults have a pronounced red skin color with darker backs and average and , occasionally reaching up to . They also have a large Kype during spawning.〔http://www.adfg.alaska.gov/static/education/wns/coho_salmon.pdf〕 Mature females may be darker than males, with both showing a pronounced hook on the nose.
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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