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I wonder if it's a story from Hokkaido

1/30 Edited to

... Read more北海道の魚の話をしていると、「イワナってサケ?」「サーモンとマスとトラウトって同じ?」みたいな疑問が必ず出ます。私も釣り場や売り場で名称が混ざっていて混乱したので、ざっくり“分類”で整理すると理解が早かったです。 まず大枠で言うと、サケもイワナもニジマスもブラウントラウトも、全部まとめて「サケ科」の仲間です。ここが最初のポイントで、「サケ科=サケだけ」ではありません。その中でさらに属(グループ)が分かれていて、普段の呼び名(サケ、マス、トラウト、イワナ)は、この分類と流通名・呼び習慣が混ざって使われています。 私の理解で一番スッキリしたのは、イワナは「イワナ属」の魚で、サケは「サケ属」の魚という違い。つまり“イワナとサケは同じサケ科だけど、属が別”なので、見た目や生態もけっこう違います。イワナは冷たい上流域のイメージが強く、斑点模様が特徴。サケは海と川を行き来する回遊魚として有名で、産卵期に川を上るイメージですよね。 次にややこしい「マス」と「トラウト」。これは分類学的にビシッと1対1で決まる言葉というより、地域・文化・流通での呼び分けが入りがちです。たとえば日本だと、海に下るタイプを「サクラマス」、湖に残るタイプを「ヤマメ(陸封型)」みたいに同じグループでも呼び名が変わることがあります。さらに「トラウト」は英語圏由来の呼び方で、ニジマス(レインボートラウト)やブラウントラウトのように外来種も含めて“トラウト”と呼ばれがち。私は釣り情報で「トラウト」と書いてあると、ニジマス系を想像することが多いです。 北海道の魚の種類として押さえておきたいサケ科は、サケ(秋サケ)・サクラマス(ヤマメ系)・ニジマス・ブラウントラウト・イワナ、そして北海道らしさで言うならイトウ。イトウは同じサケ科でも別格感があって、図鑑や分類系統図でも存在感があります。 見分けのコツとして私がよくやるのは、①模様(斑点の出方)②尾びれの形③口の大きさ④いた場所(上流・湖・本流・海が近いか)をセットで見ること。名前だけで迷ったら、「サケ科の中のどのグループ?」と分類で一度立ち止まると、サケとイワナの違いも、マスとトラウトの違いも整理しやすくなります。

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