紀伊半島南西岸におけるイサキ，Ｐａｒａｐｒｉｓｔｉｐｏｍａ　ｔｒｉｌｉｎｅａｔｕｍの成熟と性比

DOI 日本農学文献記事索引 Web Site 被引用文献2件 参考文献12件

書誌事項

タイトル別名
  • Maturation and Sex Ratio of Three-line Grunt, Parapristipoma trilineatum along the Southwestern Coast of Kii Peninsula, Japan
  • キイ ハントウ ナンセイガン ニ オケル イサキ Parapristipoma trilineatum ノ セイジュク ト セイヒ

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抄録

Maturation and sex ratios were examined in three-line grunt, Parapristipoma tyilineatum, occurring along the southwestern coast of Kii Peninsula, Japan. Monthly changes in gonad index (GI) demonstrated that the spawning season in this region, from April to July peaking in May and June, was slightly earlier than previously reported for other regions. GI values indicated that no females at age 1 year and all females over 2 years were mature, compared with some males at age 1 year and all males over 2 years. The sex ratio was female-biased in May and June, but male-biased in July, September and October. Because the female-biased sex ratio in May was represented by fish in the 200-239 mm fork-length class (mainly 2-3 years old) and that in June by the 200-219 mm fork-length class (mainly 2 years old), together with the fact that these samples were caught by angling and set net, there seemed to be a behavioral difference between the sexes (mainly in 2-3 year-old fish) during their spawning migration. Based on whole samples, the sex ratio was female-biased in the 190-219 mm fork-length class (and 2 year old fish) and male-biased in the greater than 300 mm fork-length class (and fish older than 7 years) .

収録刊行物

  • 水産増殖

    水産増殖 55 (4), 529-534, 2007

    日本水産増殖学会

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