ToxSci Advance Access published online on December 2, 2003
Toxicological Sciences, doi:10.1093/toxsci/kfh042
Toxicological Sciences © Society of Toxicology 2003; all rights reserved
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1 INRS-Institut Armand-Frappier, Université du Québec, Pointe Claire, QC, H9R 1G6
* To whom correspondence should be addressed. E-mail: daniel.cyr{at}INRS-IAF.uquebec.ca.
There is limited information on the physiological consequences associated with exposure to xenoestrogens under field conditions. The objectives of this study were to determine the presence of estrogenic chemicals in the St. Lawrence River and their effects on male reproduction in the spottail shiner (Notropis hudsonius). Hepatic vitellogenin (VTG) mRNA levels in immature shiners indicate extensive estrogenic contamination spanning almost 50 kms both upstream and downstream from the island of Montreal. Stages of spermatogenesis were assessed in fish captured at sites having varying levels of estrogenic contamination. In control fish, 95% had testis of either stage IV (50%) or stage V (45%) of spermatogenesis. At Île Dorval, where VTG mRNA levels are moderate, fish had testes of stage III (38%) and IV (45%) and only 15% of fish were at spermatogenic stage V. In contrast, at Îlet Vert and Île Beauregard, located in the sewage effluent plume from the City of Montreal and where hepatic VTG mRNA levels are high in fish, none of the fish were at stage V and 8% of fish at Îlet Vert were at stage II of development. Sperm concentration and various motility parameters were significantly lower in shiners from Îlet Vert as compared to those from Îles de la Paix (reference). Histological analyses of testes revealed that more than one third of the fish captured at sites with the highest estrogenic contamination displayed intersex, a condition in which ovarian follicles were developing within the testis. These data indicate that there is significant estrogenic contamination in the St. Lawrence River that is associated with impaired reproductive function in male fish.
© 2003 Society of Toxicology
Reproductive and Developmental Toxicology
Consequences of Xenoestrogen Exposure on Male Reproductive Function in Spottail Shiners (Notropis hudsonius)
2 St. Lawrence Centre, Environment Canada, Montreal, QC, H2Y 2E7
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