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ベーリング海でさけ・ます類資源調査

終わってしまった調査に関するニュースですが、

EICネット[国内ニュース - ベーリング海で2004年さけ・ます類資源調査開始]

 ということで、6月17日から7月16日まで


 これまでの調査研究で、夏季ベーリング海でのさけ・ます類の生物学特性や資源状態が明らかになってきているが、さけ・ます類の持続可能な管理のためにはさらに、(1)海洋環境の変化がさけ・ます類の生活史や資源変動に与える影響、(2)さけ・ます類を中心とした北太平洋の環境収容力、(3)各系群の相互作用・競合関係が資源変動に与える影響--といった要素を解明する必要がある。
 今回の調査では、(一)ベーリング海の海洋物理環境と海洋生態系の構造・現存量の変化、(二)環境収容力概算のための餌生物量のデータ蓄積、(三)日本系サケと他のサケ系群、他のさけ・ます類の分布量、競争関係、(四)流網と表層トロール網による漁獲効率の比較--に関する調査を行う。

 という調査が行われたそうです。おいおい結果がでることと思いますが、ひとまず報告まで。
 なお、調査等については、水産庁のプレスリリースに詳しく載せられています。また、こちらには、過去の調査の慨報も掲載されています。まとめの部分を載せると

ベーリング海に最も多く分布しているさけ・ます類はサケ(シロザケ)であり、遺伝的系群識別の結果、日本系サケが広く分布し他系群の分布と重なっている可能性が示された。

だそうです。ということで、記事を総合すると、ようするに、

 この調査は、「日本が人工孵化放流事業を強力に押し進めた結果、従来日本産サケが回遊する地域を越えて、他国のサケをも圧迫するほどになっている。」と、他国(といってもロシア、アメリカ、カナダですが)からクレームがでているが、日本としてはそうではなく、環境の変化のためにそうなっている、ということを明らかにしたい。

 ということでしょうか。(いつもながら、間違いに気づかれた方、つっこんでやってください)

2004 07 17 03:41 PM | 固定リンク

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