Fertilization success and sexual behavior in male medaka, Oryzias latipes, exposed to tributyltin

Kei Nakayama, Yuji Oshima, Tomomi Yamaguchi, Yukinari Tsuruda, Ik Joon Kang, Makito Kobayashi, Nobuyoshi Imada, Tsuneo Honjo

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)


We evaluated the effects of tributyltin (TBT), polychlorinated biphenyls (PCBs), and a mixture of TBT and PCBs on reproduction, gonadal histology, and sexual behavior in Japanese medaka (Oryzias latipes). We administered TBT (1 μgg-1 body weight [b.w.] daily), PCBs (1 μgg-1 b.w. daily), or both to medaka for 3 weeks. We assessed reproductive success during week 3 and the sexual behavior of male medaka after the exposure period. Fertilization success was significantly decreased in groups that received TBT. The profiles of fertility developed a bimodal distribution in the TBT and TBT+PCBs groups, and the numbers of males that performed "following" and "dancing" were significantly decreased in the TBT+PCBs group. The frequency of "dancing" also decreased after treatment with TBT, whereas fish that received PCBs only showed no difference in sexual behavior. Testes that had oocytes showed normal spermatogenesis, even though two of the five males treated with TBT+PCBs had some indication of testis-ova, which did not occur in any other group. Our results indicate that TBT, but not PCBs, affects sexual behavior and reproduction in medaka.

Original languageEnglish
Pages (from-to)1331-1337
Number of pages7
Issue number10
Publication statusPublished - Jun 2004

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis


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