Morphometric and Histopathological Parameters of Gonadal Development in Adult Common Carp from Contaminated and Reference Sites in Lake Mead, Nevada

Journal of Aquatic Animal HealthVolume 15, Issue 1 p. 55-68 Article Morphometric and Histopathological Parameters of Gonadal Development in Adult Common Carp from Contaminated and Reference Sites in Lake Mead, Nevada Reynaldo Patiño, Corresponding Author Reynaldo Patiño [email protected] U.S. Geological Survey, Texas Cooperative Fish and Wildlife Research Unit, Texas Tech University, Lubbock, Texas, 79409-2120 USACorresponding author: [email protected]Search for more papers by this authorSteven L. Goodbred, Steven L. Goodbred U.S. Geological Survey, National Water Quality Assessment Program, Western Region, Sacramento, California, 95819 USASearch for more papers by this authorRassa Draugelis-Dale, Rassa Draugelis-Dale U.S. Geological Survey, National Wetlands Research Center, Lafayette, Louisiana, 70506 USASearch for more papers by this authorCatherine E. Barry, Catherine E. Barry Department of Biological Sciences, Texas Tech University, Lubbock, Texas, 79409-2120 USASearch for more papers by this authorJ. Scott Foott, J. Scott Foott U.S. Fish and Wildlife Service, California–Nevada Fish Health Center, Anderson, California, 96007 USASearch for more papers by this authorMelody R. Wainscott, Melody R. Wainscott Texas Cooperative Fish and Wildlife Research Unit, Texas Tech University, Lubbock, Texas, 79409-2120 USASearch for more papers by this authorTimothy S. Gross, Timothy S. Gross U.S. Geological Survey, Atlantic and Caribbean Science Center, Gainesville, Florida, 32653 USASearch for more papers by this authorKenneth J. Covay, Kenneth J. Covay U.S. Geological Survey, Water Resources Division, Las Vegas, Nevada, 89706 USASearch for more papers by this author Reynaldo Patiño, Corresponding Author Reynaldo Patiño [email protected] U.S. Geological Survey, Texas Cooperative Fish and Wildlife Research Unit, Texas Tech University, Lubbock, Texas, 79409-2120 USACorresponding author: [email protected]Search for more papers by this authorSteven L. Goodbred, Steven L. Goodbred U.S. Geological Survey, National Water Quality Assessment Program, Western Region, Sacramento, California, 95819 USASearch for more papers by this authorRassa Draugelis-Dale, Rassa Draugelis-Dale U.S. Geological Survey, National Wetlands Research Center, Lafayette, Louisiana, 70506 USASearch for more papers by this authorCatherine E. Barry, Catherine E. Barry Department of Biological Sciences, Texas Tech University, Lubbock, Texas, 79409-2120 USASearch for more papers by this authorJ. Scott Foott, J. Scott Foott U.S. Fish and Wildlife Service, California–Nevada Fish Health Center, Anderson, California, 96007 USASearch for more papers by this authorMelody R. Wainscott, Melody R. Wainscott Texas Cooperative Fish and Wildlife Research Unit, Texas Tech University, Lubbock, Texas, 79409-2120 USASearch for more papers by this authorTimothy S. Gross, Timothy S. Gross U.S. Geological Survey, Atlantic and Caribbean Science Center, Gainesville, Florida, 32653 USASearch for more papers by this authorKenneth J. Covay, Kenneth J. Covay U.S. Geological Survey, Water Resources Division, Las Vegas, Nevada, 89706 USASearch for more papers by this author First published: 09 January 2011 https://doi.org/10.1577/1548-8667(2003)015<0055:MAHPOG>2.0.CO;2Citations: 37Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract This study examined the hypothesis that exposure to sublethal concentrations of contaminants alters the gonadal condition of feral common carp Cyprinus carpio. Adult common carp in Lake Mead, Nevada, were collected from a contaminated site (Las Vegas Bay) that receives municipal and industrial effluent and from a reference site (Overton Arm) with a relatively low level of contamination. Fish were sampled seven times over a 1-year period extending over two separate spawning seasons. Morphometric and histopathological parameters of gonadal and germ cell development were determined. In males, the pattern of seasonal changes in the gonadosomatic index (GSI) was similar between the sites and showed no clear association with site-specific seasonal temperature profiles. However, Las Vegas Bay males had consistently lower GSI values and, on one of the sampling dates, a lower proportion of sperm relative to other germ cell stages (determined histologically). Further, Las Vegas Bay males had a higher incidence of gonadal macrophage aggregates, which are putative tissue biomarkers of contaminant exposure in fishes. In females, seasonal GSI profiles, the frequency of fish with postovulatory follicles (an index of spawning activity), and the timing of new follicle recruitment all showed differences between sites, but these differences generally matched differences in water temperature profile. Also, the peak size-frequency of full-grown follicles did not differ between sites, and estimates of fecundity for the second spawning season indicated that females from the reference site unexpectedly produced a lower number of gametes. Overall, site differences in gonadal condition were observed in carp of both sexes but they seemed to be associated with site differences in contaminant levels only in males. The apparent lack of association between contaminant level and gonadal condition in female carp from mildly mesotrophic Lake Mead may indicate a lack of contaminant effects in females or a confounding effect of the higher nutrient loads in the Las Vegas Bay environment. References H. E. Bevans, S. L. 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