This study evaluated the status of native and stocked fish species in 13 prairie lakes in central Canada over eight years (2007–14) using three metrics: resource‐use (benthic versus pelagic carbon via stable isotopes); body condition (relative weight index W_r); and parasite load (cestode gut enumerations). Analyses included game and non‐game fishes, like naturally occurring northern pike, Esox lucius L., and yellow perch, Perca flavescens Mitchill, but focused on stocked walleye, Sander vitreus (Mitchill) because it supports a robust recreational fishery. Walleye and northern pike were significantly more reliant on benthic carbon than yellow perch or forage fishes (p < 0.05), but this reliance was not associated with any measured environmental variables for any species. In lakes with game fishes, forage fishes exhibited higher reliance on benthic energy, possibly due to predator avoidance strategy, particularly yellow perch. Walleye body condition index was consistently lower (<95–105) than values exhibited by the other two game fishes (81–139), and parasites were only common in walleye and associated with lake‐water salinity (r² = 0.93, p < 0.05) and sex (p < 0.05). Based on the results, the most desirable game fish, walleye, appears less resilient to environmental variability than northern pike and yellow perch, making this species more susceptible to impacts of future climate change.

中文翻译：

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资源利用，身体状况和寄生虫负荷指标表明加拿大大草原湖泊中放养和本地野味鱼的健康状况相反

这项研究使用以下三个指标评估了加拿大中部13个草原湖泊在八年间（2007-14年）的原生鱼类和种群鱼类的状况：资源利用（通过稳定同位素的底栖碳与远洋碳）；身体状况（相对体重指数W _r）；和寄生虫负荷（（肠的枚举）。分析包括野味和非野味鱼类，例如自然出现的北部梭子鱼（Esox lucius L.）和黄鲈（Perca flavescens Mitchill），但重点是放养的角膜白斑，Sander vitreus（Mitchill），因为它支持强大的休闲渔业。角膜白斑和北部派克比黄色鲈鱼或草鱼更依赖底栖碳（p <0.05），但是这种依赖性与任何物种的任何测量环境变量均无关。在有野味鱼的湖泊中，草鱼对底栖动物的能量依赖性更高，这可能是由于避免了捕食者的策略，尤其是黄鲈。眼的身体状况指数始终低于（<95–105），低于其他两种猎物所显示的值（81–139），并且寄生虫仅在wall眼中常见并且与湖水盐度有关（r ²  = 0.93，p  < 0.05）和性别（p  <0.05）。根据结果​​，最可取的野味鱼（角膜白斑）对环境变化的抵抗力似乎不如北方派克和黄鲈，这使得该物种更容易受到未来气候变化的影响。