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島根県のサケ

 サケの南端を探るシリーズ????です。

今秋もサケ遡上 島根県川本で13日に観察会

 島根県の川本町、公式サイトをみると、まさに中国山地の山懐、という場所のようです。ここで、10月下旬からサケの遡上・産卵を見ることができるとのこと。
 一度に20匹ほどのサケが姿を現すということですから、けっこうな量が遡上しているのではないでしょうか。
 山陰では以前紹介した江の川のサケが比較的知られているように思いますが、逆に江の川にのぼるのだから、それよりも東に位置する島根県や鳥取県でものぼってもおかしくないのですよね。たぶん記事にならないだけで、各地の河川でサケがみられるのではないでしょうか。

 そうそう、13日には観察会が開かれるそうです。実際に産卵している現場も見られるようですし、中国地方のかた、いかがでしょうか。

2004 11 15 04:43 PM | 固定リンク

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鳥取県東部の小河川におけるサケの遡上情報です。
兵庫県との県境、岩美町にある蒲生川の支流の小田川には、数年前から毎年サケの遡上が見られます。
今年も11月7日に地元有志によるサケの観察会が行なわれました。あいにくまだ水温が高いとのことで、1匹しか観察できませんでしたが・・・。
小田川は全長10km程度の小河川で、以前は上流の銅鉱山(現在は廃坑)からの鉱毒によって、サケはおろか魚の影のない「死の川」だったという過去があります。
当然のこと漁業者も漁協もなく、過去に人工放流されたこともありません。
現在はこの川も関係者の浄化の努力が実って、徐々に魚の影が戻ってくるようになりましたが、サケの遡上は住民にとって大変な驚きでした。
ちなみに、鳥取県中部の天神川、鳥取県西部の日野川では漁協による稚魚の放流が行なわれています。

投稿者: 田中重樹 (Nov 18, 2004 6:13:55 PM)

 貴重な情報ありがとうございます。
 鳥取でも各河川で大分のぼっているのですね。サケはいわゆる清流でなくても遡上をしますし、河川の長さもそれほどきにしません(河口でも砂利や湧水などの条件があれば産卵をしますので)。そのため、河川の浄化の一つの目安になりやすいかもしれません。
 統計では毎年必ず遡上する河川の最西端が鳥取県西部の河川だったと記憶しています。生存の条件としては問題ないはずですし、今後もいろいろな河川で遡上が見られるようになることを願います。
 また、情報がございましたらコメントをいただければ幸いです。

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