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知床におけるカラフトマスの遡上数、サケの10倍

 もう2月も終わりですね~ハヤイモノデス
 あいかわらずまったりした更新頻度ですが、ぼちぼちやらせて頂いております。ここのところ、職場の研究紀要に書くと宣言してしまい、反省しつつ原稿書きに追われております。
 ということで、ちょっとしたニュースの紹介を

リンク: マス遡上数、サケの10倍 知床科学委で報告 .


 【斜里】世界自然遺産に登録された知床の保全について助言する知床科学委員会の会合が二十三日、網走管内斜里町で開かれ、小宮山英重委員(野生鮭研究所所長)が、遺産登録地内の河川ではカラフトマスの遡上(そじょう)数がシロザケの十倍に達しているとの調査結果を報告した。

 小宮山委員は昨年八月から十二月にかけ、二、三週間おきに斜里町内の八河川と根室管内羅臼町の十一河川を調査。生きている魚の数と死んでいる魚の数、産卵床数を調べ、そこからカラフトマスは十八万匹、シロザケは一万八千匹が遡上したと推定した。

 カラフトマスが多い理由について、急峻(きゅうしゅん)な登録地内の川が魚体の比較的小さなマスの遡上に適しているためと考察。「知床では、マスが海と川の生態系をつなぐ重要な役割を果たしている」と指摘した。


 特にコメントはなく、知床まで行くと、こんなにカラフトマスが増えるのか~、という程度なのですが。ちょっと気になるのは、カラフトマスとサケは遡上時期が少し違って、カラフトマスは8月ごろだったような。で、沿岸の漁はサケを主な対象としていたはずのですので、シロザケが少ないというのは、その影響もあるような気がするのですが。このあたりなかなか計算は難しいとは思うのですがどうなんですかね。
 ところで、カラフトマスはセッパリマスともいい、婚姻色が出始めると背中が隆起しだして、とてもきれいな印象です。一度、その遡上、産卵の様子をこの目で見てみたいものです。いいな~、知床旅行か~>遠い目

2006 02 28 05:08 AM | 固定リンク

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おはようございます。久々ですね。
昨年、知床に出張したときにカラフトマスの遡上を見学する機会がありました。9月の中旬、オシンコシンの滝周辺でしたが、その姿は観光できている人達の目を釘付けにしておりました。確かに、秋サケの姿は少なかったような・・・

市場での取扱は圧倒的に秋サケが多いのですが、マス多いのですね。秋サケは定置網で獲られてしまって、マスが残されて遡上しているのですかねぇ?

毎年8月の終わりに、マス卵で作った「いくら」「醤油筋子」を食べるのが楽しみな私です。(#^.^#)

投稿者: 発展的水産市場商人 (Feb 28, 2006 7:10:14 AM)

札幌時代、知床にはよく行ったので、川で胴長を着てカラフトマスを観察していました。
セッパリになった大きな雄はきれいで迫力もありますね。
カラフトマスの利用ですが、マスの定置でそれなりに捕られています。(サケに比べ、規模は小さいと思いますが)
オホーツク海沿岸では、オホーツクサーモンという名で売り出しを図っていますし、身近な所では、その辺のスーパーで売っているサケ缶の原材料として案外食べていると思いますよ。

投稿者: トリイ (Feb 28, 2006 11:05:22 PM)

コメントありがとうございます。お二方ともカラフトマスの遡上、ごらんになっているのですね。うらやましいです。
>発展的水産市場商人さま
 マスのいくら、少し小粒な印象ですが、あれはあれでおつですよね。
>トリイさま
 沿岸でも結構取っていましたか。調べもせずに書いてしまい反省です。9月ぐらいまでは結構はいるはずですし、当然といえば当然ですが。
 たしかに、いわゆる鮭缶の多くがカラフトマス(かベニザケ)ですからなじみはありますよね^^;

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