Sockeye salmon - Sockeye salmon
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A fish of the Salmonidae family (illustration). It is also called sockeye salmon. The landlocked species includes the kokanee salmon. They migrate upstream from the Sacramento River in North America to the coastal waters of the North Pacific Ocean, including Alaska, Kamchatka, and the eastern coast of Hokkaido. They are silvery-white when living in the open ocean, but turn red in nuptial coloration during spawning season. Females are slightly darker than males. Males have significantly protruding upper and lower jaws that are bent into a hook shape. In Japan, a small number of kokanee salmon migrate upstream to the Tokachi River, where fertilized eggs were transplanted from the United States, and several thousand kokanee salmon migrate upstream to the Nishibetsu River, where fertilized eggs were transplanted from Lake Shikotsu. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
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サケ目サケ科の魚（イラスト）。ベニマスともいう。陸封型にヒメマスがいる。北アメリカのサクラメント川から，アラスカ，カムチャツカ，北海道東岸に至る北太平洋沿岸水域に遡上（そじよう）する。外洋に生息するときには銀白色であるが，産卵期になると紅色の婚姻色を呈する。雌は雄に比べてやや暗色を帯びる。雄は上下両あごが著しく突出し，かぎ形に曲がる。日本では，アメリカから受精卵を移殖した十勝川にわずかと，支笏湖からヒメマス卵を移殖した西別川に数千匹遡上している。
出典 株式会社平凡社世界大百科事典 第２版について 情報 |
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