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故郷の川迷わずサケ遡上 アミノ酸の違いが決め手

河北新報ニュース 故郷の川迷わずサケ遡上 アミノ酸の違いが決め手

サケが生まれ故郷の川に、支流の分岐点でも間違えずに遡上(そじょう)するのは、水に含まれているアミノ酸の種類や量の違いをにおいとしてかぎ分けているためであることを、青森大の栗原堅三学長ら研究グループが突き止めた。

とのこと。
匂いの研究は、鼻を詰まらせて泳がせると、目的の川がわからない、ということがわかっていたのですが、アミノ酸とは。
 とはいえ、人文系の私には、なんのことやら。実際にサケを獲っている漁師さんと話したとき、「サケって、自分の生まれた川に戻るっていうらしいな、本当かや」と聞かれました。別の川の漁師さんは「サケは生まれた川に戻るように頭のいい魚なんだ。だからサケを獲るときも細心の注意が必要なんだ」などと話していました。
 いや、ちょっと、思い出しただけなんですが。

2004 02 07 09:02 AM | 固定リンク

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