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十和田湖でヒメマス放流

秋田・青森の県境に位置する十和田湖でヒメマスの放流が両県合同で行われたというニュースです。
ヒメマスの稚魚31万匹を放流/十和田湖、資源回復に願い込め

 十和田湖は明治時代まで魚のいない湖としてしられていたそうで、和井内貞行によって稚魚養殖・放流がなされた結果、ヒメマスが繁殖するようになったことで知られています。そのヒメマスも近年は減少傾向にあったことから、ここ数年増殖にちからを入れているとのこと。
 ちなみにヒメマスは陸封型のベニザケで、日光中禅寺湖で自然繁殖していることで知られています。
 サケ科魚類は、必ずしも海に降りなくても、湖などで成長する例が多く、琵琶湖のビワマスなどが自然状態で繁殖しているほか、かつて大量のサクラマスが上っていた阿賀野川水系でも、只見川の上流に田子倉ダムなどが関した結果、ダム湖で成長するサクラマスが見られるようになったという例もあります。
 ひとまず紹介まで。

2004 06 30 12:51 PM | 固定リンク

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