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Environ Toxicol Chem

Title:		Reproductive characteristics of male mosquitofish (Gambusia affinis) inhabiting a small southeastern U.S. river receiving treated domestic sewage effluent
Author(s):		Angus RA; Weaver SA; Grizzle JM; Watson RD;
Address:		"Department of Biology, University of Alabama at Birmingham, 35294, USA. raangus@uab.edu"
Journal Title:		Environ Toxicol Chem
Year:		2002
Volume:		21
Issue:		7
Page Number:		1404 - 1409
DOI:
ISSN/ISBN:		0730-7268 (Print) 0730-7268 (Linking)
Abstract:		"A population of western mosquitofish (Gambusia affinis) living below a wastewater treatment plant in the vicinity of Birmingham (AL, USA) was studied for evidence of exposure to estrogens. Mosquitofish are sexually dimorphic live-bearing fish. Males have an elongated and modified anal fin, called a gonopodium, used in mating. It has been hypothesized that exposure to estrogens and/or anti-androgens in treated wastewater might inhibit the androgen-dependent development of the gonopodium. The population in this study showed no evidence of having been exposed to endocrine-disrupting chemicals. The difference in adjusted (for overall fish size via analysis of covariance) mean gonopodium length between effluent-exposed and control populations was not significant. No detectable levels of vitellogenin were observed in the blood of any of the male mosquitofish, either from the effluent-exposed or the control population. Testes and livers were weighed and examined histologically. The fish exposed to treated wastewater effluent had significantly larger adjusted mean weights for both testis and liver, but no histological changes indicating exposure to estrogens were observed"
Keywords:		"Alabama Animals Cyprinodontiformes/blood/*growth & development Environmental Monitoring/*methods Female Fresh Water Gonads/drug effects Liver/drug effects Male Organ Size Reproduction/*drug effects Sewage/*chemistry Vitellogenins/blood Water Pollutants, C;"
Notes:		"MedlineAngus, Robert A Weaver, Season A Grizzle, John M Watson, R Douglas eng Research Support, U.S. Gov't, Non-P.H.S. 2002/07/12 Environ Toxicol Chem. 2002 Jul; 21(7):1404-9"