Spawning frequency of thetTsushima Current subpopulation of chub mackerel Scomber japonicus off Kyushu, Japan

Tetsuro Shiraishi, Suvarna D. Ketkar, Yoshiki Katoh, Mitsuo Nyuji, Akihiko Yamaguchi, Michiya Matsuyama

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)649-655
Number of pages7
JournalFisheries science
Volume75
Issue number3
DOIs
Publication statusPublished - May 2009

All Science Journal Classification (ASJC) codes

  • Aquatic Science

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