Abstract
Female Japanese chub mackerel Scomber japonicus of the Tsushima Current subpopulation were collected during the spawning season from March to May 2001. A total of 137 adult females were caught between midnight and daybreak. A considerable number of fish displayed new postovulatory follicles (POF), whereas there was no evidence of germinal vesicle breakdown or hydrated oocytes in any of the fish collected. This suggests a daily spawning synchronicity toward midnight. To estimate the spawning frequency (S), the female reproductive state was classified into four criteria based on the degenerative stage of the POFs and the developmental stage of the oocytes. To stage the POFs according to age and determine the stage duration, ovaries from S. japonicus were induced to spawn in the laboratory and were sampled 0–72 h after ovulation at appropriate intervals. The average S, which is evaluated from four different indices, was 16.9%, corresponding to the average female chub mackerel spawned every 5.9 days (8.5 times) during the 50 days.
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Acknowledgments
The authors are grateful to the students of the Laboratory of Marine Biology, Kyushu University, for assistance during the experiment period. This study was supported in part by a Grant-in-Aid for Scientific Research (16380136) from the ministry of Education, Science, Sports and Culture of Japan.
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Shiraishi, T., Ketkar, S.D., Katoh, Y. et al. Spawning frequency of the Tsushima Current subpopulation of chub mackerel Scomber japonicus off Kyushu, Japan. Fish Sci 75, 649–655 (2009). https://doi.org/10.1007/s12562-009-0094-0
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DOI: https://doi.org/10.1007/s12562-009-0094-0