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Intersex (testicular oocytes) in largemouth bass (Micropterus salmoides) on the Delmarva Peninsula, USA

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We describe the prevalence and severity of intersex in the form of testicular oocytes (TO) in largemouth bass (Micropterus salmoides; LMB) 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 2005–2007 survey of approximately 200 male specimens representing 6 fish and 2 frog species collected from numerous small‐order streams on Delmarva, intersex was only observed in LMB (system‐wide prevalence 17%). During 2008/2009 TO were encountered in male LMB from 6 lakes and one large river system with prevalences ranging from 33–88% (weighted arithmetic mean 57%). Prevalence of TO in LMB from Delmarva lakes was comparable to the highest levels reported in a national USGS reconnaissance of this species, which also occurred in regions of the Atlantic coastal plain with intensive row crop and animal agriculture. To our knowledge, this represents the first report in the peer‐reviewed scientific literature of TO in fish on the Delmarva Peninsula. Environ Toxicol Chem © 2014 SETAC

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