Marine fish - Kaisangyō (English spelling)

Japanese: 海産魚 - かいさんぎょ（英語表記）marine fish

A general term for fish that live in saltwater. It is the opposite of freshwater fish and is also called saltwater fish. Depending on the species, they live in a variety of places, such as the open ocean, coasts, bays, estuaries, brackish lakes, the surface, middle and bottom layers, the deep sea, reefs, coral reefs and seaweed beds, and many species migrate between these areas as they grow or with the seasons. There are significantly more species of marine fish than freshwater fish, and marine fish account for approximately 98% of Japan's total fish production, including industrial fishing and aquaculture. Seawater contains various inorganic salts, including sodium chloride, and while the concentration is somewhat lower in coastal waters, the total salt concentration in ocean waters reaches approximately 3.5%.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

海水域にすむ魚の総称。淡水魚に相対する語で，海水魚ともいう。外洋，沿岸，内湾，河口，鹹水（かんすい）湖，また表層，中層，底層，また深海，岩礁，サンゴ礁，藻場など，種類によってすむ場所はさまざまであり，また成長に伴い，あるいは季節により，それらの間を回遊するものも少なくない。種類数も淡水魚に比べて著しく多いが，産業的にも漁業，養殖業を含め日本の魚類総生産量のおよそ98％を海産魚が占める。　海水中には塩化ナトリウムをはじめさまざまな無機塩類が含まれ，沿岸水ではやや少ないが，外洋水では塩類総濃度がおよそ3.5％に及ぶ。

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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