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大畑川のスギノコ

 本日の河北新報紙面にて、大畑川のスギノコが紹介されていました。なんでも陸封されたサクラマス、つまりヤマメなのですが、生息域が普通のヤマメよりも上流で、イワナよりも上流にいるという点が特徴とか。ネット上の記事をみると次のようなものがありました。

スギノコ
大畑の山と川と海の物語

 大畑川の中流に赤滝という滝があり、そこよりも上流に魚が昇ることはなく、生物相が異なるようです。ちなみにサケ、マスの遡上も赤滝までみられており、カギを使った漁がなされていました。この辺りについては、”大畑の山と川と海の物語”にいろいろと載っていますので、スギノコ以外にも興味がおありの方はどうぞ。

 現在のところヤマメの亜種にも認定はされていないようですが、生物的にも生態的にもヤマメとの違いがいろいろとあるようです。新聞記事も含め強調されている点はオスメスの比率が一対一である点です。これは、一般にヤマメの場合メスが降海するのに対して、オスは残留することが多いため、ヤマメのメスが非常に少ないことに対して特徴になっているようですが、スギノコの場合、こうした特徴のためにオスメスがつがいとなって産卵するという点(ヤマメの場合は複数のオスが放精権?をめぐって争います)が非常にめずらしいようです。
 スギノコが成立した原因についてはいろいろあるようで、上記”大畑の山と川と海の物語”には


 大昔、サクラマスが産卵していた川が、火山のふん火で流れ出た溶岩(ようがん)にせきとめられたため、海にもどれなくなったサクラマスがイワナと同じように川で生活するようになって、イワナとの生存競争(せいぞんきょうそう)に勝ったためです。

と記されていますし、本日の河北新報では、山仕事の人たちが食料として放流したもののうち、一部が取り残された、と記されています。どこまで本当かわかりませんが、そのくらい奇妙な場所に繁殖しているヤマメのようです。
 なお、スギノコの写真は浅虫水族館のサイト、2003年サマーフェスティバルにあります。参考まで。

 現在は、赤滝より上流川が全て禁漁になっていて、釣りをすることはできません。あしからず。

2004 08 03 02:49 PM | 固定リンク

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