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投網使い北上川でサケ漁

ちょっとショックなニュース。いや、私にとってですが。
 岩手放送にて、北上川の投網漁がニュースになっていました。

リンク: IBC NEWS:投網使い北上川でサケ漁[11:51].


盛岡周辺の北上川では人工ふ化のためのサケ漁が最盛期を迎えています。
朝もやが川面を包む北上川。午前6時、波立つ川面にめがけて最初の網が投げられました。このサケ漁は「北上川水系さけ・ます増殖組合」がサケの人工ふ化のため県の許可を得て9月頃から行なっているものです。仕掛けは川の所々に泳がせているメスをおとりにして、近寄ってくるサケをねらうというもので、今朝もオス・メスあわせて4~5匹が獲れました。

 で、どの辺がショックかというと…
まず、現在も投網漁が定例で行われていて、それが北上川ということ。
そして、投網をするためにおとりのメスを用意しているということです。

 投網漁そのものは、カギやヤスなどの漁具と違い、魚体に傷を付けないので現在でも行われていても不思議はないのですが、あまりにも効率が悪い気がします。
 そして、後者は古い河川でのサケ漁の必需品で、このメスに集まってきて、さて産卵行動に入ろうかな、というところを捕まえてしまうという漁になります。
 遡上中のサケはかなり慎重な魚とされ、人影を見ると逃げてしまうのですが、産卵時だけはそちらに集中するためか捕まえやすいとされています。そのため、おとりを用意する以外にも、産卵場で産卵行動に入った所を捕まえる、というのが、特に上流部の一般的な取り方でした。(ちなみに投網は仙台の広瀬川でも行われていますが、こちらは堰堤で上れなくなったサケを狙うもので、ちょっと性格がことなります。またおとりのメスを用意する漁としては新潟県の大川のコド漁があります。)
 近年では人工孵化目的のため、数匹の漁獲では意味がない、ということもあり、こうした漁法はほぼ見られなくなったのかな、と思っていましたが、こうして行われているところもあるのですね。

 朝6時に盛岡か~、折を見て見に行ってみたいものです。

2005 10 15 08:51 AM | 固定リンク

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