Intersex (testicular oocytes) in largemouth bass (Micropterus salmoides) on the Delmarva Peninsula, USA
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Abstract
The authors describe the prevalence and severity of intersex in the form of testicular oocytes in largemouth bass (Micropterus salmoides) collected over a 5-yr period from a variety of surface waters on the Delmarva Peninsula, USA, a region dominated by poultry production and agricultural land use. During a survey from 2005 to 2007 of approximately 200 male specimens representing 6 fish and 2 frog species collected from numerous small-order streams on Delmarva, intersex was observed in only largemouth bass (system-wide prevalence 17%). During 2008 and 2009, testicular oocytes were encountered in male largemouth bass from 6 lakes and 1 large river system, with prevalence ranging from 33% to 88% (weighted arithmetic mean, 57%). The prevalence of testicular oocytes in largemouth bass from Delmarva lakes was comparable to the highest levels reported in a national US Geological Survey reconnaissance of this species, which also occurred in regions of the Atlantic coastal plain with intensive row-crop and animal agriculture. To the authors' knowledge, the present study represents the first report in the peer-reviewed scientific literature of testicular oocytes in fish on the Delmarva Peninsula.
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