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Marine Biology

, Volume 160, Issue 10, pp 2733–2741 | Cite as

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

  • Michio YonedaEmail author
  • Hajime Kitano
  • Sethu Selvaraj
  • Michiya Matsuyama
  • Akio Shimizu
Original Paper

Abstract

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.

Keywords

Gonadosomatic Index Vitellogenic Oocyte Ovarian Maturation Japanese Anchovy Oocyte Size 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We are grateful to the staff and students of the Fishery Research Laboratory and Laboratory of Marine Biology at Kyushu University for their support in rearing and measuring the specimens. We also thank three anonymous reviewers for valuable comments. This research was funded by a subproject on studies on the prediction and application of fish species alternation (SUPRFISH), financed by the Agriculture, Forestry and Fisheries Research Council of Japan, as part of the Population Outbreak of Marine Life (POMAL) Project.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Michio Yoneda
    • 1
    Email author
  • Hajime Kitano
    • 2
  • Sethu Selvaraj
    • 3
  • Michiya Matsuyama
    • 3
  • Akio Shimizu
    • 4
  1. 1.National Research Institute of Fisheries and Environment of Inland SeaImabariJapan
  2. 2.Fisheries Research Institute of Karatsu, Department of Joint Research, Faculty of AgricultureKyushu UniversityKaratsuJapan
  3. 3.Laboratory of Marine Biology, Department of Bioresource Sciences, Faculty of AgricultureKyushu UniversityFukuokaJapan
  4. 4.National Research Institute of Fisheries ScienceYokohamaJapan

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