Concentrations of total mercury (THg) in the axial musculature of northern pike (Esox lucius), walleye (Sander vitreus), lake whitefish (Coregonus clupeaformis), and sauger (Sander canadensis) were analyzed from several regions of Lake Winnipeg and three main inflows, focusing on Mossy Bay in the North Basin of the lake. Length-standardized means (standard means) indicated THg concentrations in pike of 550 mm fork length (0.44 ppm) and walleye measuring 400 mm (0.38 ppm) from Mossy Bay were highest in 1971 and declined to 0.13 and 0.22 ppm, respectively, by 1974. Standard means of both these species have been similar since 2010 (walleye; approximately 0.11 ppm) and 2013 (pike; approximately 0.17 ppm), except for a significant increase to 0.15 ppm in walleye in 2019, potentially related to concurrent changes in trophic interactions with invasive fish and invertebrate species. Standard means of 300 mm long sauger (0.23–0.29 ppm) did not decline significantly between 1971 and 1974, and those of 350 mm long whitefish ranged from 0.006 to 0.028 ppm from 1983 to 2016 with no clear temporal trend. In concert with data from other areas of Lake Winnipeg and the three inflows for 2000–2019, these results indicate higher contemporary concentrations in the South Basin of the lake. This latitudinal gradient in fish THg is assumed to be a result of continuous mercury inputs from the Red and the Winnipeg River, whereas a former point source of industrial mercury in the Saskatchewan River is no longer relevant. According to human consumption limits based on tolerable daily intake calculations and current THg concentrations of fish from Mossy Bay, substantial quantities of whitefish, pike, and walleye fish can be safely eaten.

北梭子鱼 ( Esox lucius )、大眼鱼 ( Sander vitreus )、湖白鱼 ( Coregonus clupeaformis ) 和沙鲟 ( Sander canadensis ) 的轴向肌肉组织中的总汞 (THg) 浓度) 分析了温尼伯湖的几个区域和三个主要流入量，重点是该湖北部盆地的苔藓湾。长度标准化平均值（标准平均值）表明，550 毫米叉长（0.44 ppm）的梭鱼和来自莫西湾的 400 毫米（0.38 ppm）的白斑鱼的 THg 浓度在 1971 年最高，到 1974 年分别下降到 0.13 和 0.22 ppm . 自 2010 年（角膜白斑；约 0.11 ppm）和 2013 年（梭鱼；约 0.17 ppm）以来，这两种物种的标准平均值相似，但 2019 年角膜白斑的含量显着增加至 0.15 ppm，这可能与营养相互作用的同时变化有关入侵鱼类和无脊椎动物。1971 年至 1974 年间，300 毫米长的白鲑（0.23-0.29 ppm）的标准平均值没有显着下降，而 350 毫米长的白鱼的标准平均值在 0 之间。从 1983 年到 2016 年，006 到 0.028 ppm，没有明显的时间趋势。与温尼伯湖其他地区的数据以及 2000-2019 年的三个流入量相一致，这些结果表明该湖的南盆地具有更高的当代浓度。鱼类 THg 的这种纬度梯度被认为是来自红河和温尼伯河的连续汞输入的结果，而萨斯喀彻温河以前的工业汞点源不再相关。根据基于每日可耐受摄入量计算和 Mossy Bay 鱼类当前 THg 浓度的人类消费限制，可以安全食用大量的白鱼、梭子鱼和大眼鱼。这些结果表明该湖的南盆地具有更高的当代浓度。鱼类 THg 的这种纬度梯度被认为是来自红河和温尼伯河的连续汞输入的结果，而萨斯喀彻温河以前的工业汞点源不再相关。根据基于每日可耐受摄入量计算和 Mossy Bay 鱼类当前 THg 浓度的人类消费限制，可以安全食用大量的白鱼、梭子鱼和大眼鱼。这些结果表明该湖的南盆地具有更高的当代浓度。鱼类 THg 的这种纬度梯度被认为是来自红河和温尼伯河的连续汞输入的结果，而萨斯喀彻温河以前的工业汞点源不再相关。根据基于每日可耐受摄入量计算和 Mossy Bay 鱼类当前 THg 浓度的人类消费限制，可以安全食用大量的白鱼、梭子鱼和大眼鱼。