Gonadosomatic Index and Testis Morphology of Common Carp (Cyprinus carpio) in Rivers Contaminated with Estrogenic Chemicals

Journal of Veterinary Medical Science

Kazuya HIRAMATSU¹  Fumihiko SASAKI²  Amin HASSANIN²  Yasuhiro TSUKAMOTO²  NURHIDAYAT²  Sachi KUWAHARA²  Kazushige OGAWA² 

[1] Osaka Prefectural Freshwater Fish Experiment Station;Laboratory of Veterinary Anatomy, Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University

关键词: carp;    estrogenic chemical;    gonadosomatic index;    histology;    testis;   

DOI  :  10.1292/jvms.64.921

学科分类：兽医学

来源: Japanese Society of Veterinary Science

【 摘 要 】

References(35)Cited-By(30)To study the effect of estrogenic chemicals on fish, the gonadosomatic index (GSI = [testis weight/body weight] × 100) and testis histology of mature common carp (Cyprinus carpio) from 2 contaminated sites (Ishizu and Wada rivers, Osaka) and a control site were examined between June 1998 and March 2001. The concentration of nonylphenol, bisphenol A and 17β-estradiol in the Ishizu river was 3-4 times higher than in the Wada river. In the pre-breeding and breeding seasons, there were no significant differences in body weight among carp from the 3 sites, the body weight of Ishizu river carp being significantly lower (p<0.05) than that of Wada river fish only in the post-breeding season. The GSI and testis weight in fish from the Ishizu river were significantly lower (p<0.05) than in control fish during all phases of gonadal cycle and lower than in Wada river fish in the pre-breeding and post-breeding season. No histological abnormalities were found in the testes of the males examined. Histological observation of the testes revealed a delay in the onset of spermatogenesis in fish from the Ishizu river compared with those from the other sites. These results clearly imply that the estrogenic chemicals in the Ishizu river adversely affect the testis development of the fish.

【 授权许可】

Unknown