Hamilton S J, Waddell B
U.S. Fish and Wildlife Service, National Fisheries Contaminant Research Center, Yankton, South Dakota 57078-9214.
Arch Environ Contam Toxicol. 1994 Aug;27(2):195-201. doi: 10.1007/BF00214263.
Eggs from three female and milt from five male endangered razorback suckers (Xyrauchen texanus) were collected from the Razorback Bar (about 20 km upstream of Ashley Creek) in the Green River of northeastern Utah. Eggs, but not milt, had concentrations of selenium that were above the range of selenium concentrations in control fish from laboratory studies or reference fish from field studies. The concentrations, however, were below those reported in selenium-exposed fish that had reproductive problems in laboratory studies or field investigations. Tests with three streamside spawned pairs of razorback suckers, which were sampled for eggs and milt in this study, resulted in no hatching of fertilized eggs. Concentrations of selenium in eggs and milt were significantly correlated with selenium concentrations in muscle plugs taken from the same fish, but egg and milt concentrations were not significantly different from muscle plugs. Selenium concentrations in eggs of razorback suckers in the Green River may be sufficiently elevated to cause reproductive problems that are contributing to the decline of this species in the upper Colorado River Basin.
从犹他州东北部格林河的野猪滩（阿什利溪上游约20公里处）采集了三只雌性濒危奇努克鲑的鱼卵和五只雄性的精液。鱼卵中的硒浓度高于实验室研究中的对照鱼或野外研究中的参考鱼的硒浓度范围，但精液中的硒浓度未超出此范围。然而，这些浓度低于实验室研究或野外调查中出现生殖问题的硒暴露鱼的报告浓度。对本研究中采集鱼卵和精液的三对在溪边产卵的奇努克鲑进行测试，结果受精卵未孵化。鱼卵和精液中的硒浓度与取自同一条鱼的肌肉块中的硒浓度显著相关，但鱼卵和精液中的浓度与肌肉块中的浓度无显著差异。格林河奇努克鲑鱼卵中的硒浓度可能已充分升高，足以导致生殖问题，这也是造成该物种在科罗拉多河上游流域数量下降的原因之一。
