Suppression of sexual behavior in male Japanese medaka (Oryzias latipes) exposed to 17β-estradiol

Yuji Oshima, Ik Joon Kang, Makito Kobayashi, Kei Nakayama, Nobuyoshi Imada, Tsuneo Honjo

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96 Citations (Scopus)


Mating pairs of Japanese medaka (Oryzias latipes) received 17β-estradiol (E2; dose, 3 and 30 μg/g body weight daily) in their diet and E2-free diet (control) for two weeks. The effect on reproductive success was assessed in the mating pairs, and sexual and nonsexual behaviors in the male were quantified. The fecundities of the E2-treated groups were reduced significantly (p < 0.05) compared with those of control, and the sexual behaviors (following, dancing, floating, and crossing) of male fish in response to prostaglandin F2α (PG)-injected E2-unexposed females were suppressed dramatically. While the fertility of spawned eggs and the frequencies of the nonsexual behaviors of resting and swimming in a straight line performed by male were unchanged in E2-exposed groups. Therefore, sexual behavior in male may be linked with reproductive success in mating pair of madaka exposed to E2. This assay for sexual behavior using PG may provide a useful tool for assessing the effect of endocrine-disrupting chemicals.

Original languageEnglish
Pages (from-to)429-436
Number of pages8
Issue number3
Publication statusPublished - Jan 2003

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Public Health, Environmental and Occupational Health
  • Pollution
  • Health, Toxicology and Mutagenesis
  • Environmental Engineering
  • Environmental Chemistry


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