Gonadosomatic index and testis morphology of common carp (Cyprinus carpio) in rivers contaminated with estrogenic chemicals.
To study the effect of estrogenic chemicals on fish, the gonadosomatic index (GSI = [testis weight/body weight] x 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 17beta-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.
Hassanin
Amin
A
Laboratory of Veterinary Anatomy, Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University, Sakai, Japan.
Kuwahara
Sachi
S
Nurhidayat
Tsukamoto
Yasuhiro
Y
Ogawa
Kazushige
K
Hiramatsu
Kazuya
K
Sasaki
Fumihiko
F
D000818:Animals; D001835:Body Weight / Q000187:drug effects; D002347:Carps / Q000002:abnormalities / Q000254:growth & development*; D004967:Estrogens / Q000032:analysis / Q000633:toxicity*; D005618:Fresh Water / Q000737:chemistry*; D007564:Japan; D008297:Male; D009929:Organ Size / Q000187:drug effects; D012098:Reproduction; D012621:Seasons; D013091:Spermatogenesis / Q000187:drug effects; D013737:Testis / Q000002:abnormalities / Q000187:drug effects* / Q000254:growth & development*; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
D004967:Estrogens; D014874:Water Pollutants, Chemical