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自然に遡上するサケ

 川に昇るサケは人工孵化のためにのみ獲っても良い、という話はこのサイトでも何度か紹介してきましたが、自然に昇るサケはどうなるのでしょうか。ちょっと考えさせる記事がありました。

河川公園の段差でサケ遡上できず1

 青森市を流れる天田内川は孵化を行っていない河川で、基本的に自然産卵か間違えたサケが遡上する川のようです。ここの親水公園に噴水用の堰が設けられているためにサケの遡上が妨げられている、というニュースです。
 公園を整備している県では対応を考えたいということですが、興味の引かれる話です。

 ここで問題になるのは、孵化を行っている河川の場合、事業を行う漁協などの組合が県などに働きかけ、こうした施設が作られることはまずない、というところでしょうか。これはアユなどの魚も同様だと思いますが、漁業権(サケは違いますが)が設定されていれば、それにともなって魚の資源保護の視点が持ち込まれますが、そうでない場合はこのように、何気なく人工物が設置されてしまう、ということのように思われます。

 サケに視点を限定すると、国内ではサケの資源減少に歯止めをかけ、増加をするために江戸時代までは自然産卵に任せていたものに”加えて”、人工孵化事業が始められました。さらに、戦後は法律で規制することで、この流れを強化した、というようにみることができます。あくまでも人工孵化事業は、自然産卵だけでは足りない分を補うためにはじまった事業である、というのが前提だと思います。
 ところが、自然産卵の環境はなおざりで、人工孵化のための環境整備には力を入れる、というのははたして、適切な姿なのだろうか、という疑問が湧いてきます。
 もちろん、孵化事業に関わっておられる方々が、自分たちが関わる河川についての環境向上に力を入れることには何も問題はありませんし、そうすることで、サケだけではなく多くの生物にとって好ましい結果がもたらされるので、単に資源確保という面以外にもサケの孵化事業がもたらす効果は大きいことはいうまでもありません。
 しかし、サケの自然回帰がみられる河川の場合、その環境維持はNPOなどに頼るだけではなく、行政側も意識すべきでしょうし、またそうした河川環境等々のNPOを育成する責任があるような気がします。
 自然状態での回帰の増加もまた、人工孵化事業と平行して力を入れていくべき事柄ではないだろうか。

2004 11 14 06:30 AM | 固定リンク

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