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佐賀・唐津で稚魚放流!

そろそろ稚魚放流ニュースが出てきています。それぞれ報告してもきりがありませんので、目立ったものを紹介しよう、と考えていたら、目立ったものがありました。

玉島川でサケ2万匹放流--唐津 /佐賀

 佐賀で放流です。うーん、地図をちゃんと見たわけではありませんが、最西南端の放流ではないでしょうか。
 記事では毎年放流しているとありますが、回帰しているのでしょうか。ものの本を読んだとき、明治10年代に人工孵化放流の技術が導入された際、全国で稚魚飼育がブームになり、壱岐でも孵化場が作られ数年で失敗した、というのがあったと記憶していますが、それの現代版というところでしょうか。あ、もちろん失敗したわけではないのですが。
 唐津ですから日本海側ということで、海流の条件さえ整えば大丈夫だとは思いますが、どうなんでしょうかね。

2005 02 28 01:55 PM | 固定リンク

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この記事を読んでから狙ってまして、先日取材(大袈裟)してきました。(^^
役場の観光課で聞いたところを簡単に書くと、


旧浜玉町(今は唐津市に合併)漁協による事業
始めた理由:昔から釣り人に時折発見されていた事がきっかけ。
人工放流すればより多くの鮭がかえるようになるかもしれない。
玉島川の水質環境維持の指針にもなる。
などから実験的に計画開始。

平成7年九月、富山の黒部川漁協から稚魚1500匹を購入。放流。

毎年稚魚を放流。

平成10年頃から、受精卵に変更。毎年大体2万粒ほど。人工孵化、放流。

平成15年の遡上確認数は、21匹。
大体毎年10~20後半ほどみたいです。
確率千分の一。
ただ、これは釣り人や周辺住民の目撃数であり、また元々多少ながら鮭の上がっていた川なので、人工放流事業の成果が果たしてどれだけ出ているかについては、いまひとつはっきりしない気がします。

また、上流は鮎も昇らない急流になっているらしいので、産卵に適した場所があるのかも不明です。(旅行の都合上今回は川上までは行けませんでした)

とにかく、ここの人工放流は今のところ、とてもじゃないけど採算のとれない事業なので、環境配慮や文化的な側面を大切にしているようです。
だからこそ毎年、地元の小学生たちの手で放流されているんでしょうね。

自分たちの手で放した魚が帰ってくる川と想えば、汚したりできませんもんね。


では、長々とまとまりが無い文を書き込んですみませんでした。
こちらの情報のおかげで旅先で想わぬ勉強ができました。
ありがとうございました!

投稿者: 西川 (May 20, 2005 8:43:16 AM)

興味深いレポートありがとうございます。
 たぶん採算のとれる人工孵化事業って北陸までだと思います。とはいえ、サケが帰ってくるというのは非常に象徴的ですし、河川環境を考える上では意味があると思います。
 でも想像以上に本格的にやっているのですね。

 ところで、今は佐賀近辺ですか。日本海側から回ってられるのですよね。もう少しで半分というところでしょうが。旅の方、頑張ってください。また、サケ関連ネタ、ありましたら情報、よろしくお願いします。

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