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珍しい場所でのサケ遡上調査

 そろそろサケの遡上シーズンも終了に近づいてきていますが、ここ数日のニュースのなかで気になるものがありました。

「見かけたら連絡を」 きょうから遠賀川サケ遡上調査
五行川のサケ回帰定着を 真岡のNPOが採捕、採卵

 前者が福岡県、後者が栃木県の話です。ともに人工孵化事業の統計には現れていない場所で、サケ関連の調査などが行われているということ。
 福岡県遠賀川は以前紹介した鮭神社が鎮座している場所で、以前より継続的に鮭の遡上がみられたのが、炭坑の影響で一時途絶え、近年復活してきていることから、調査をしてみよう、というもののようです。こちらでは「遠賀川に鮭を呼び戻す会」という組織が中心となって放流を行っているということで、天然物も含め、数匹が毎年みられるということのようです。
 栃木県は那珂川水系で鮭の遡上がみられますが、現在は茨城県側にウライが設けられていることもあり、基本的にはその姿が見られなくなっています。ただ、利根川水系川ではウライの設置がないこともあり、ちらほらとその姿を見ることができ、ここ数年は継続的に遡上が確認できているようです。こちらもNPO法人「五行川・小貝川鮭守(さかもり)の会」が中心となって稚魚の購入放流をしていたということですが、最近は天然の遡上があることから、人工孵化事業のための特別採捕許可を得て、事業を開始したということ。栃木県では最初の例だそうです。
 NPOによる人工孵化事業は宮城県の七北田川でも行われており、初めてということではありませんが、事業当初の目的が水産資源、ということもあり、多くの川で漁協が中心となって事業が進められることを考えると、全国的には非常に珍しい事例だと思います。
 ただ、このブログでもなんどか触れてきましたが、最近の河川環境保持に対するNPOの関わり方や、サケという魚の位置づけ、そして水産資源と人工孵化事業の現状を考えれば、こうした動きは今後全国的に広がっていくような気がします。経済的にはなかなか大変なことだとは思いますが、事業が安定し、河川環境向上のシンボルとしてサケが位置づけられていくようになれば、それもよいことだと思いますし、こうした動きに関するニュースはなるべく紹介していきたいと思います。

2004 11 27 04:59 PM | 固定リンク

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