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サケの放流数と来遊数及び回帰率の推移

サケの放流数と来遊数及び回帰率の推移

サケマス資源センターの頁をみていたら、こんな記事もありました。
グラフを眺めると、本当に放流数が増えていることがわかりますし、近年は頭打ちから減少傾向にあることがわかります。放流数は、補助金できまりますので、国の方針として、「もう、そんなに増やさなくていいや」といっている訳ですね。
これに対して、来遊数は増えつつも、大幅に減る年があり、たぶん稚魚(どこまでをいうのかは調べていませんが)段階で大量死したということなんですかね。

また、このグラフは北海道分と本州分に分かれていますが、本州分は増減幅が小さいように見られます。私も本州のサケ漁を調べていますから、その調査で今年が多い、少ないという言葉とうらはらに、案外変動が少ないのかも知れません。もちろん、こうした統計は本州全部をまとめて、というものですから、私がするように、川を歩き、漁師さんから話を聞くレベルとは全然違うのですが。
漁師さんたちの感覚は、落ち葉が遅いから今年は不漁、といったレベルなので。

2004 04 12 01:45 PM | 固定リンク

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