Dynamics of gonadosomatic index of fish with indeterminate fecundity between subsequent egg batches: Application to Japanese anchovy Engraulis japonicus under captive conditions

Michio Yoneda, Hajime Kitano, Sethu Selvaraj, Michiya Matsuyama, Akio Shimizu

研究成果: ジャーナルへの寄稿学術誌査読

13 被引用数 (Scopus)

抄録

The gonadosomatic index (GSI) is widely used as a simple measure of reproductive capacity, but its validity has often been questioned. This study showed the inter-spawning variation in the predicted GSI of Japanese anchovy using the gravimetric oocyte packing density method. Time course sampling showed that final oocyte maturation and subsequent ovulation occurred from afternoon to evening on the day of spawning. Oocyte in vitro assay, however, suggested that the timing of the spawning could be predetermined by midnight the day before spawning. Models predicted that the GSI of a female just after spawning gradually increases until the completion of germinal vesicle breakdown, after which it dramatically rises by 24-53 % per hour within a few hours of the onset of ovulation. This indicates that the predicted GSI of a female increases by 3.5 times within about 19 h before ovulation, even if the relative batch fecundity remains constant.

本文言語英語
ページ(範囲)2733-2741
ページ数9
ジャーナルMarine Biology
160
10
DOI
出版ステータス出版済み - 10月 1 2013

!!!All Science Journal Classification (ASJC) codes

  • 生態、進化、行動および分類学
  • 水圏科学
  • 生態学

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