若狭湾西部海域におけるタチウオの漁業生物学的研究　ＩＩ　　若狭湾西部海域におけるタチウオの産卵期と性比

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  • Study on the fishery biology of ribbon fish, Trichiurus lepturus, in the western Wakasa Bay - II. Spawning season and sex ratio of ribbon fish in the western Wakasa Bay.
  • ワカサワン セイブ カイイキ ニ オケル タチウオ ノ サンランキ ト セイヒ

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This paper deals with the spawning season and sex ration of ribbon fish Trichiurus lepturus in the western Warasa Bay from June, 1981 to February, 1983, which were caught by longline, trolling, set net, purse seine and Danish seine. It was found that the spawning season was from June to September and the highest value fo gonad index of both sexes were shown from July to August. In the early spawning season. maturation of gonad was found in large sized fish more than 300 mm of anal length, and maturation made progress in orde of size. Just before the spawning season, schools of larger fish with the sexratio 1 : 1appeared in this area. In the spawning season. females and males dominated the near shore and offshore, respectively. It was suggested that the difference in the distribution of the sexes was concerned with the mating system.

収録刊行物

  • 日本水産学会誌

    日本水産学会誌 50 (8), 1279-1284, 1984

    公益社団法人 日本水産学会

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