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サケの遡上量調査

 グーグルニュースを見ているといろいろとサケ遡上関連のニュースがありますが、本日紹介するのは、こちら。

中里村でサケの遡上量調査開始

 信濃川の中流は発電のための取水で水量が少ないため、実際どの程度遡上しているのか、確認してみようということのようです。江戸時代には信州でもサケが捕れていたのですが、現在は記事中にある大滝ダムの影響もありまったく上らなくなっています。孵化場のリストには、大滝ダムのすこし下流、長野県栄村の志久見川で採捕をしており、年間100匹程度の捕獲があるとされています。
 しかし、信濃川クラスの大河でも、ダムの取水により本流でこうした影響があるのですね。単にサケを呼び戻すのであれば、受精卵を買ってきて放流を繰り返せば、ある程度帰ってくるようになるのですが、自然に遡上する河川に戻すのは…。
 現在の河川環境を考えると、単に水質改善だけではなく、魚道の整備や産卵場の整備(サケに関しては)なども併せて考える必要があり難しいものですね。

2004 10 14 09:14 AM | 固定リンク

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