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Body color change and serum steroid hormone levels throughout the process of sex change in the adult wrasse, Pseudolabrus sieboldi

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Abstract

Gonadal sex steroid hormones are the principal factors that directly control the gonadal and morphological alterations during sex change in hermaphrodite fish; however, the physiological mechanism of action by which these hormones govern body coloration is poorly understood. The protogynous wrasse Pseudolabrus sieboldi is a good model for understanding the physiological mechanisms of gonadal and body color change during sex change in hermaphrodite fish. To obtain information on the relationship between sex steroids and body color change during the process of gonadal sex change, we analyzed body color, gonadal histology, and serum levels of sex steroids. Body color was analyzed using a quantitative analytical method based on the hue value. Compared to other body parts of the fish, the anal fin changed color the most, becoming increasingly redder in association with gonadal changes that converted ovaries to testes. Levels of serum 11-ketotestosterone (11KT) increased as the gonadal sex change proceeded, whereas no significant change was observed in estradiol-17β (E2) levels. Moreover, we found a significant correlation between the hue value of the anal fin and serum 11KT levels, but not E2 levels. These results suggest that androgen, but not estrogen, plays a principle role in the changes in both gonadal morphology and body color in the transformation from female to male in this species. To our knowledge, this is the first quantitative demonstration of the relationship between body color and serum steroid levels during sex change in fish.

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Acknowledgments

We extend our sincere thanks to Captain Y. Shichida of the research vessel Wakasugi for providing generous support during fish sampling, and to the staff of the Fishery Research Laboratory of Kyushu University for assistance during the experiments. This study was supported by JSPS Research Fellowship for Young Scientists.

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Authors and Affiliations

  1. Laboratory of Marine Biology, Faculty of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, 812-8584, Japan

    Kohei Ohta, Mayumi Hirano, Takayuki Mine, Hiroshi Mizutani, Akihiko Yamaguchi & Michiya Matsuyama

  2. Division of Reproductive Biology, National Institute for Basic Biology, Okazaki, 444-8585, Japan

    Kohei Ohta

  3. Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, 96813, USA

    Kohei Ohta

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  1. Kohei Ohta
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  2. Mayumi Hirano
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  3. Takayuki Mine
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  4. Hiroshi Mizutani
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  5. Akihiko Yamaguchi
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  6. Michiya Matsuyama
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Correspondence to Kohei Ohta.

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Communicated by S. Nishida.

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Ohta, K., Hirano, M., Mine, T. et al. Body color change and serum steroid hormone levels throughout the process of sex change in the adult wrasse, Pseudolabrus sieboldi . Mar Biol 153, 843–852 (2008). https://doi.org/10.1007/s00227-007-0856-0

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  • DOI: https://doi.org/10.1007/s00227-007-0856-0

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