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北米の害魚対策

 こんなニュースがありました。

リンク: 捕食魚の報奨制度がサケを救う~最大「賞金」は500ドル.

 なんでも、ノーザンパイクミノーという魚が、サケの稚魚を食べてしまうので、報奨金を設けて、捕獲していこうという動きだそうです。

 サケの稚魚を食べるノーザンパイクミノーを減らそうと、西海岸の北部3州では釣りの報奨制度が設けられている。
(中略)
 連邦政府や地方政府が、コヨーテ、ジネズミ、カラス、スカンク、ヌートリア(沼ネズミ)などの害獣に報奨金を出す例は多いが、報奨金付きの魚はノーザンパイクミノーだけという。
 釣りが上手で、週7日、1日12~18時間を釣りに費やせる人なら、5~10月の期間中に2万ドル稼ぐのも夢ではない。昨年賞金を受け取った1800人のうち、2人が約4万ドルを稼いでいる。昨年の総捕獲量は24万1000匹だった。
 水力発電ダムがいくつか建設された後、川の流れが遅くなり、サケの稚魚がノーザンパイクミノーに襲われやすくなった。サケを捕食する魚はほかにもいるが、最も捕食量が多いのがパイクミノーで、大型(最大で約25インチ)になると1日にサケ6匹を平らげる。
 BPAはノーザンパイクミノー増殖防止事業に年間380万ドルを投じている。生物学者によると、報奨制度でパイクミノーの数は22%減少。年間約380万匹の子ザケが救われていることになる。サケが増えることで、アラスカからカリフォルニア沿岸のサケ漁関連で年間270万~990万ドルの収入と446件の雇用創出が見込めるという。


ということだそうです。
 興味を持ったのは、問題の発生源がダムで、そのため流速が遅くなったために襲われることが多くなったという部分です。この話は日本でもありそうな気がしますが、研究されている方っていらっしゃるのですかね。
 先に紹介した、川にネットを張るという話もつながるような気がしますが、日本の場合、自然状態では考えられない量の稚魚が放流されているので、それに伴う生態系への影響っていろいろあるような気がしますが、どうなんでしょうか。

2006 05 27 12:35 PM | 固定リンク

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川のギャング、パイクですね。一度釣ってみたいなぁ。

投稿者: ハヤト (Jun 7, 2006 11:12:15 PM)

お返事が遅くなりました。
釣り味はよいのですかね~、しかし、パイクが駆除するくらいうようよいるというのも、なかなか怖い感じですね。

投稿者: ruger (Jun 12, 2006 5:17:01 AM)

まったくです。

>日本の場合、自然状態では考えられない量の稚魚が放流されているので...
倫理観にもつながる話しですねぇ。
釣りのためにバスを放すとか。
プレジャーのために生態系を乱すとなれば、教育水準も低いと考えちゃうな。

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