McClain William C, Chumchal Matthew M, Drenner Ray W, Newland Leo W
Biology Department, Texas Christian University, Fort Worth, Texas, USA.
Environ Monit Assess. 2006 Dec;123(1-3):249-58. doi: 10.1007/s10661-006-9194-9. Epub 2006 Oct 13.
We examined how length of fish is related to mercury concentrations in muscle tissue of seven species of fish from Lake Meredith, Texas and determined how sex and growth rate are related to mercury concentration in walleye (Sander vitreus). Flathead catfish (Pylodictis olivaris), walleye and white bass (Morone chrysops) had the highest concentrations of mercury and channel catfish (Ictalurus punctatus), common carp (Cyprinus carpio), river carpsucker (Carpiodes carpio) and gizzard shad (Dorosoma cepedianum) had the lowest concentrations of mercury. Mercury concentrations were positively correlated with total length (TL) of fish for all species except gizzard shad, which exhibited a negative correlation between mercury concentration and TL. Male walleye grew more slowly than females, and males had higher concentrations of mercury than females. We also assessed the differences in fish consumption advisories that would be issued using Texas Department of State Health Services (DSHS) guidelines versus United States Environmental Protection Agency (USEPA) recommendations. Using DSHS guidelines, no fish species in Lake Meredith would be issued a fish consumption advisory. Nevertheless, DSHS has issued an advisory for walleye in Lake Meredith, possibly due to an inadequate sample size of fish. Using USEPA guidelines, a fish consumption advisory would be issued for the largest size class of flathead catfish but no advisory exists for flathead catfish in Lake Meredith. We suggest that when fish in a lake may be contaminated with mercury, all game fish in the lake should be assessed, and mercury advisories should take fish size into account.
我们研究了德克萨斯州梅雷迪思湖七种鱼类的体长与肌肉组织中汞浓度之间的关系，并确定了白斑狗鱼（Sander vitreus）的性别和生长速率与汞浓度之间的关系。平头鲶（Pylodictis olivaris）、白斑狗鱼和白鲈（Morone chrysops）的汞浓度最高，而沟鲶（Ictalurus punctatus）、鲤鱼（Cyprinus carpio）、河吸盘鲤（Carpiodes carpio）和遮目鱼（Dorosoma cepedianum）的汞浓度最低。除遮目鱼外，所有物种的汞浓度均与鱼的全长（TL）呈正相关，遮目鱼的汞浓度与TL呈负相关。雄性白斑狗鱼生长速度比雌性慢，且雄性的汞浓度高于雌性。我们还评估了使用德克萨斯州州立卫生服务部（DSHS）指南与美国环境保护局（USEPA）建议发布的鱼类消费建议之间的差异。根据DSHS指南，梅雷迪思湖的任何鱼类都不会发布鱼类消费建议。然而，DSHS已发布了梅雷迪思湖白斑狗鱼的消费建议，可能是由于鱼类样本量不足。根据USEPA指南，将对最大尺寸类别的平头鲶发布鱼类消费建议，但梅雷迪思湖的平头鲶不存在此类建议。我们建议，当湖泊中的鱼类可能被汞污染时，应评估湖泊中的所有游钓鱼类，并且汞建议应考虑鱼的大小。
