Abstract
Halichoeres poecilopterus (Labridae) is a protogynous, hermaphroditic fish common in temperate waters around Japan. Although oocyte degeneration is an established event at the onset of sex change, there is little information on the process. We examined cell numbers and proportional ratios of ovarian germ cells in sex-changing gonads of H. poecilopterus. This confirmed a lack of YV (yolk vesicle stage) and Y (yolk stage) oocytes, a rapid decrease of P (perinucleolus stage) oocytes, and a slight increase of CN (before/at chromatin nucleolus stage) germ cells. We discuss gonadal conditions necessary for the protogynous sex change of H. poecilopterus.
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Acknowledgments
The authors are grateful to S. Ohtsuka, J. Shoji, S. Iwasaki, and other members of the Takehara Marine Science Station of Hiroshima University; K. Uematsu, K. Matsushita, N. Tsujita, the crewmembers of the research vessel Toyoshio-maru of Hiroshima University; and members of the laboratory of the Biology of Aquatic Resources Department of Hiroshima University for supporting our study. We also thank three anonymous reviewers for their valuable comments on this manuscript. This study was partly supported by the Japan Society for the Promotion of Science for Young Scientists. All experiments in this study complied with the current laws of Japan.
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Miyake, Y., Nishigakiuchi, J., Sakai, Y. et al. Ovarian degeneration during the female-to-male sex change in the protogynous hermaphroditic fish, Halichoeres poecilopterus . Ichthyol Res 59, 276–281 (2012). https://doi.org/10.1007/s10228-012-0280-4
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DOI: https://doi.org/10.1007/s10228-012-0280-4