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Sockeye salmon
Sockeye salmon (''Oncorhynchus nerka'') — also called red salmon or blueback salmon in the United States — is an anadromous species of salmon found in the Northern Pacific Ocean and rivers discharging into it. This species is a Pacific salmon that is primarily red in hue during spawning. They can grow up to 84 cm in length and weigh 2.3 to 7 kg. Juveniles remain in freshwater until they are ready to migrate to the ocean, over distances of up to 1,600 km. Their diet consists primarily of zooplankton. Sockeye salmon are semelparous, dying after they spawn. Some populations, referred to as kokanee, do not migrate to the ocean and live their entire lives in fresh water.
==Classification and name origin==
Sockeye salmon is the third-most common Pacific salmon species, after pink and chum salmon.〔(【引用サイトリンク】 publisher = NOAA Fisheries Office of Protected Resources )〕 ''Oncorhynchus'' comes from the Greek ὄγκος (onkos) meaning "barb", and ῥύγχος (rhynchos) meaning "snout". ''nerka'' is the Russian name for the anadromous form.〔(【引用サイトリンク】url=http://www.fishbase.org/Summary/SpeciesSummary.php?ID=243&AT=sockeye+salmon )〕 The name "sockeye" is an anglicization of ''suk-kegh'' ((unicode:sθə́qəy̓)), its name in Halkomelem, the language of the indigenous people along the lower reaches of the Fraser River (one of British Columbia's many native Coast Salish languages). ''Suk-kegh'' means "red fish".〔(【引用サイトリンク】title=nationalgeographic.com )〕
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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