三重県青蓮寺湖と滋賀県西の湖におけるオオクチバスの生殖腺成熟

DOI 機関リポジトリ NDLデジタルコレクション 日本農学文献記事索引 HANDLE ほか1件をすべて表示 一部だけ表示 被引用文献4件 参考文献23件

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  • Gonadal maturation of largemouth Bass Micropterus salmoides in Lakes Shorenji and Nishinoko, Central Japan.
  • ミエケン ショウレンジコ ト シガケン ニシ ノ コ ニ オケル オオクチバス ノ セイショクセン セイジュク

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Gonadal maturations of the largemouth bass collected from Lakes Shorenji (typical reservoir) and Nishinoko (typical swamp) were histologically analyzed. The age and the minimum size at first maturation in both lakes and both sexes were estimated as 2-year-old and about 230 mm SL, respectively. Although their spawning periods were estimated as being from late April to late June in Lake Shorenji and from mid-April to mid-May in Lake Nishinoko, well-developed yolked oocytes were found in the ovaries of the fish from both lakes from late fall to early summer. The peaks of spermatogenesis occurred in spring and fall, male gonadosomatic indices indicating high values in winter. These reproductive cycles of largemouth bass, which started to develop from fall, extended their spawning period and May have been an important factor of naturalization of the species into various environments in Japanese inland waters.

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  • 日本水産学会誌

    日本水産学会誌 68 (2), 151-156, 2002

    公益社団法人 日本水産学会

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