Lotus (Opsariichthys uncirostris)

Japanese: ハス(鰣) - ハス(英語表記)Opsariichthys uncirostris
Lotus (Opsariichthys uncirostris)
A freshwater fish of the Cyprinidae family (illustration). In Osaka, this species is called Ketabasu and the Oikawa is called Hasu. Its native habitat was limited to Lake Biwa, Lake Mikata in Fukui Prefecture, and the Hasu River that flows into these lakes, but it was transferred to various parts of the country along with the small ayu of Lake Biwa and released into the sea, and is now breeding in the Kanto region and other areas. It swims actively on the surface of clear lakes and rivers and jumps on the water surface. It feeds on small fish and insects, and in Lake Biwa it prefers to prey on small ayu. It is shaped like the Oikawa, but has a large mouth and both jaws bent in a "H" shape.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
コイ目コイ科の淡水魚(イラスト)。大阪では本種をケタバス,オイカワをハスと呼ぶ。原産地は琵琶湖,福井県三方湖およびこれに注ぐ鰣川(はすかわ)に限られていたが,琵琶湖のコアユに混じって国内各地に移殖,放流されて現在では関東地方などに繁殖している。水の澄んだ湖や川の中,表層を活発に泳ぎ,また水面にとびはねる。餌は小魚や昆虫などで,琵琶湖ではコアユを好んで捕食する。形はオイカワに似るが口が大きく両あごが〈ヘ〉の字状に曲がるのが特徴。

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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