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サクラマス遡上のための魚道設置を要望

大樽川に「サクラマス遡上の道設置を」
 最上川上流の大鱒川に設置が進められる発電所に魚道がないため、サクラマスの遡上が阻害されていることから、設置の要望を出したという記事です。
 サクラマスは源流近くで産卵するため、こうした発電所、ダム、堰堤等の影響が大きい魚で、各地でサクラマスの姿が消える一番の影響のようです。
 この記事で注目したのは


東北電力山形支店によると同様の要望は他県でもあるというが、同支店は「魚道設置には多額の工事費がかかるので検討していない」。県置賜総合支庁は「魚が遡上できるようにしてほしいと思うが、要望書の扱いは関係機関と協議し検討する」としている。

ここで、魚道の設置は検討していない、ということです。現在、こうした河川の構造物で魚道の設置は当然のことと思っていたのですが、違ったんですね。なので、魚道を設置しても、流露が狭いためにものすごい水流になって、魚も上れない魚道ができる、といった例も、とりあえず要望もあるし、かたちだけ、という発想があるのですかね(勝手な想像です)。
 アメリカ、ワシントン大学には構内に魚道があって、キングサーモンの遡上を、魚道に設置された観察窓からみることができるという文章を読んだことがあります(岩本由輝「南部鼻曲がり鮭」)。国内でも、千歳のサケのふるさと館では、ウライ直下に施設があり、観察窓があり、サケの遡上をみることができます。せっかく、大規模な工事をするのだから、側面からの観察窓や直上から魚道が見られる施設があれば、少なくとも私は通うのに、などと思ってしまいました。

2004 06 12 10:02 AM | 固定リンク

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