東京湾内湾域におけるマアナゴ Conger myriaster とヌタウナギ Eptatretus burgeri の分布について

作者: MAMI HARADA , TADASHI TOKAI , KEIICHI UCHIDA , TAKAMICHI SHIMIZU

DOI: 10.2331/SUISAN.72.894

关键词:

摘要: 東京湾内湾域におけるマアナゴとのヌタウナギ分布を検討するために,あなご筒漁船の漁獲操業日誌(1994~2002 年)から漁区別 CPUE(漁獲量 kg/筒 1 本)の月別分布図を作成した。マアナゴは,春季に来遊,着底した後,呼称めそあなご(全長 35 cm 未満のマアナゴ)として内湾域の千葉県寄りの漁場で 8 月頃から混獲され始め,全長 に達したものが 11 月頃から銘柄あなごとして水揚げされ,内湾域全域に分布を広げる。ヌタウナギは,主に内湾域南西部の中ノ瀬周辺の水深 30 m 以深に分布した。これらの分布や季節変化に影響する要因についても考察した。

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