Gonadal maturation and sex reversal in blacktip grouper <i>Epinephelus fasciatus</i> off Shima Peninsula, Mie Prefecture, central Japan

DOI Web Site
  • Kawase Daisuke
    Fish-Stock Enhancement Laboratory, Graduate School of Bioresources, Mie University
  • Yodo Taiga
    Fish-Stock Enhancement Laboratory, Graduate School of Bioresources, Mie University Cetacean Research Center, Graduate School of Bioresources, Mie University
  • Ogawa Kiyohiro
    Fishery Research Station, Kii-kuroshio Bio-Regional Field Science Center, Graduate School of Bioresources, Mie University
  • Funasaka Noriko
    Fish-Stock Enhancement Laboratory, Graduate School of Bioresources, Mie University Cetacean Research Center, Graduate School of Bioresources, Mie University
  • Yoshioka Motoi
    Fish-Stock Enhancement Laboratory, Graduate School of Bioresources, Mie University Cetacean Research Center, Graduate School of Bioresources, Mie University

Bibliographic Information

Other Title
  • 三重県志摩沖におけるアカハタ <i>Epinephelus fasciatus</i> の成熟と性転換
  • 三重県志摩沖におけるアカハタEpinephelus fasciatusの成熟と性転換
  • ミエケン シマオキ ニ オケル アカハタ Epinephelus fasciatus ノ セイジュク ト セイ テンカン

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Abstract

<p>Gonadal maturation of 264 blacktip grouper Epinephelus fasciatus caught off Shima Peninsula, Mie Prefecture was histologically studied. These samples consisted of 230 female, 21 male, and 13 intersex individuals. The number of mature-stage females was high from June to September, especially from June to August, and the gonadosomatic index (GSI) was high in the same period. Although, males remained spermiated throughout the year, based on histology and GSI spermatogenesis peaked in July. From these results, the peak of the spawning season was estimated to be from June to August. From the relationship between standard length and GSI, the maturation length of females was considered to be about 170 mm standard length (SL). The maturation length of males was unidentified because all specimens were already spermiated. Since all specimens smaller than the smallest intersex (188 mm SL) were females and all specimens larger than the largest intersex (268 mm SL) were males, and the maturation length of females was smaller than the smallest intersex and male individuals, we conclude that this species shows a protogynous sex change and sex reversal was estimated to start about 190 mm SL.</p>

Journal

  • Aquaculture Science

    Aquaculture Science 70 (2), 149-156, 2022

    Japanese Society for Aquaculture Science

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