Himemasu (princess trout) - Himemasu (English spelling) kokanee salmon

Japanese: ヒメマス(姫鱒) - ヒメマス（英語表記）kokanee salmon

A fish of the Salmonidae family. A landlocked form of sockeye salmon. It is native to Lake Akan in Hokkaido and Lake Chimikeppu in the upper reaches of the Abashiri River. In 1894, it was transplanted to Lake Shikotsu, where it is called Kapacheppo (a thin fish because it is flatter than Yamabe), and in 1908, it was given the name Himemasu by Moriwaki Ikumo of the Hokkaido Prefectural Government. It was transplanted from Lake Shikotsu to various parts of Japan, and the story of its transplant to Lake Towada by Wainai Sadayuki (1858-1922) is famous. The dorsal part of the body is gray-blue, the abdomen is silvery white, and during spawning season, both males and females show nuptial colors of green-brown and crimson only on the center of the side of the body.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

サケ目サケ科の魚。ベニザケの陸封型。原産地は北海道の阿寒湖と網走川上流のチミケップ湖である。1894年に支笏湖に移殖され，アイヌ語でカパチェッポ(薄い魚。ヤマベに比べると扁平なので)と呼ばれ，1908年に姫鱒の名が北海道庁の森脇幾茂により与えられた。支笏湖よりさらに日本各地へ移殖され，和井内貞行(1858‐1922)による十和田湖への移殖の話は有名である。体背部は灰青色，腹部は銀白色で，産卵期には雌雄とも緑褐色と朱紅色の婚姻色を体側の中央部のみに現す。

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