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手取川でもサケ確認

 この手のニュースを紹介し出すときりがないのですが、またしても。いや思うところがあったもので。

手取川でシロザケ今年初確認

 で、この記事で興味を持ったのはここの部分


同事務所は毎年約800万匹の稚魚を放流し、成長して手取川に戻ってきたものを捕獲、卵を採取している。昨年度は8748匹がかえった。遡上の最盛期は11月上旬ごろで、今年度は約1万5千匹がかえると予想している。

放流数です。石川県ぐらいまで行くとサケの遡上そのものがぐんと少なくなってしまうのですが、毎年800万匹も放流していたのですね。

 この数字は結構サケが上る宮城県でもかなり上位に入る、というかベスト3に入る数字だと思います。この位の放流する河川だと数万匹の遡上が一般的なので、いかに多くの稚魚を放流しているのかおわかりになろうかと思います。ちなみに本州で一番多く遡上する津軽石川の場合、15万から20万尾の遡上で6500万尾の放流です。まぁ、津軽石川の場合はかなりの受精卵を足りない河川などに販売しているので、受精数はもっと多いのですが。それを考えれば手取川も異常な量を放流しているとまではいえませんが。

 とはいえ、手取川は以前紹介したように河川におけるサケ釣りを本州で最初に解禁した川として知られています。また現在でももっとも西の解禁河川でもあります。そのため、中部・関西地方に在住の方を中心に大変人気のある川のようです。そうした人気がこうした放流量に反映しているのでしょうか。
 もちろん、もともと金沢を流れる犀川などでも大量のサケが遡上していたという話ですから、稚魚の放流量を増やせば、回帰数も増える可能性があり、まったく無駄、ということはないのでしょうが、先般の記事のように、日本全体でどの程度の資源量がよいのか、という議論がなされている中では少し奇異な気もしました。
 その背景にはこの”サケ釣り”ということもあるのかな、などとも考えたのですが、もしそれが手取川で人工ふ化放流事業にたいする一つのモチベーションになっているのなら、それはそれで興味深いものがあります。全体の資源量についての視野はもちろん必要なのですが、川の周囲でサケに関わる人の視点に立つとき、少しでも遡上量が増え、またそれをきっかけに人が集まる、ということは望ましいことだと思います。そしてその一つといしてこの”サケ釣り”があるのなら、それもまたおもしろいことだと思います。

2004 09 25 11:26 AM | 固定リンク

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