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耳石バーコード

 バーコードタグを付けたサケの捕獲かな、と思いよく読むと違いました。

サケ:“バーコード”付けたオス・メス各1匹が回帰--片岸川で本州初確認 /岩手

 受精卵段階で水温の変化させると耳石に黒白の模様が残る、という習性?があることを利用し、採卵日ごとにこうした”バーコード”をつけたサケを放流させたところ、そのサケが発見されたというニュースです。
 サケの個体識別ではアブラビレに切り込みを入れることでどこの川で放流したのかを識別する方法がありますが、当然一匹一匹切り込みを入れるので作業は大変です。しかし、この方法だと多くのサケに記録を残すことができるので、より精度の高い回遊路や回帰率の研究ができるということのようです。
 特に、受精・放流時期と回帰時期の関係は、採捕放流の計画に大きな影響を与えるような気がしますから、データの蓄積を祈りたいと思います。

 で、これは画期的な方法か!、と思ったのですが、よく考えると、耳石を見るためには解体しなくてはならず、販売用のサケではできないのですよね。人口孵化用でも同じような。なにか対応はしているのかな?
 耳石そのものについては、化石でもよくのこる非常に硬い骨、という知識はあるのですがサケの耳石の実物を見たことがないので、なんとも言えないのですが、確認作業は大変そうですね。
 宮城県でも行っていたが、昨年で終了したとか。その理由もこの辺にあるのかもしれません。
 岩手県での成果を期待したいと思います。

いつもながら、情報はFreshwater-Lifeの鳥居さんからいただきました。ここにお礼申し上げます。<(_ _)>

2005 02 10 03:50 PM | 固定リンク

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ruger様
3週間以上も前に、トラックバックしてくださっていた
事、気づきませんでした。申し訳ありませんでした。

サケの稚魚について、ウチで預かった当初は情報が
どこかにないか探し回っていました。
こちらがみつかっていればなあと今思いました。

サケは無事に学校へ返すことができました。
もうすぐ川へ放流です。

投稿者: ほしこ (Feb 12, 2005 5:40:31 PM)

わざわざコメントありがとうございます。
あまり稚魚の飼育については(自分も失敗した経験しかないもので…)扱っていないので、どの程度参考になるのか…。
また、よろしければお立ち寄りください。

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