Department of Environmental Science and Technology, University of Maryland, College Park, Maryland, USA.
Environ Toxicol Chem. 2014 May;33(5):1163-9. doi: 10.1002/etc.2544. Epub 2014 Mar 21.
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.
作者描述了在过去 5 年中，从美国特拉华半岛各种地表水中采集的大口黑鲈（Micropterus salmoides）中存在的以睾丸卵母细胞形式表现的雌雄间性的流行程度和严重程度，该地区以家禽养殖和农业土地利用为主。在 2005 年至 2007 年期间，对特拉华州的许多小河流中采集的 6 种鱼类和 2 种蛙类的大约 200 个雄性样本进行了调查，仅在大口黑鲈中观察到了雌雄间性（全系统流行率为 17%）。在 2008 年和 2009 年，在从 6 个湖泊和 1 个大河系统中采集的雄性大口黑鲈中发现了睾丸卵母细胞，流行率从 33%到 88%不等（加权算术平均值为 57%）。特拉华州湖泊中大口黑鲈睾丸卵母细胞的流行率与美国地质调查局对该物种进行的全国性侦察中报告的最高水平相当，而这些地区也位于大西洋沿岸平原的密集型作物和畜牧业地区。据作者所知，本研究首次在特拉华半岛鱼类的同行评议科学文献中报道了睾丸卵母细胞的存在。
