Glacial lakes can display a wide range of morphometries that may affect fish movements and population dynamics. Muskellunge Esox masquinongy is a popular sportfish that is long‐lived and occurs at low densities, making population abundance susceptible to sources of fish loss. Yet, factors influencing Muskellunge survival, movement, and emigration in lakes of different morphometric complexities are unknown. We used capture histories of nearly 5,700 individual adult (age ≥ 3; ≥610 mm) Muskellunge collected from a simple (single shallow lake, bowl‐shaped basin with simple shoreline) and a complex (multiple basins with greater habitat diversity) lake basin over 17 years to quantify survival, interbasin movement, and emigration from these systems and evaluate if these parameters were related to population density or water level metrics. Adult Muskellunge annual survival within the interconnected lake chain varied through time and among connected lakes (range = 0.57–0.95), whereas survival was similar among years in the simple lake basin (0.90; 95% CI = 0.85–0.96). Muskellunge movement probabilities within an interconnected lake chain ranged from 0.02 to 0.22 and increased in two systems but decreased in one system with maximum ice‐out water level over crest. Similarly, annual Muskellunge emigration ranged from 0.02 to 0.16 from an interconnected lake chain and from 0.00 to 0.28 in a simple lake and increased in both systems with increasing water levels following ice‐out. These results demonstrate that Muskellunge movement within and emigration from lakes as a function of ice‐out water levels can be an important source of fish loss (either temporary or permanent) from glacial lakes. Information on movement and emigration may help managers mitigate these losses via supplemental stocking or reduced harvest quotas, whereas constructing barriers may be a necessary component of Muskellunge management in other lake systems.

中文翻译：

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Muskellunge在一个简单而复杂的相互连接的冰川湖中的生存，跨流域运动和移民

冰河湖泊可能会表现出各种各样的形态，从而影响鱼类的活动和种群动态。Muskellunge Esox masquinongy是一种长寿且密度低的流行鲑鱼，使种群丰富易受鱼类损失的影响。然而，在不同形态复杂性的湖泊中，影响Muskellunge生存，运动和移出的因素尚不清楚。我们使用了从一个简单的（单个浅湖，碗形盆地和简单的海岸线）和一个复杂的（具有更大栖息地多样性的多个盆地）湖盆收集的近5700个成年（年龄≥3；≥610mm）成年鼠的捕获历史17年以量化这些系统的生存，跨流域移动和移民并评估这些参数是否与人口密度或水位指标相关。在相互联系的湖泊链中，成年Muskellunge的年生存率随时间和相连湖泊之间的变化而变化（范围= 0.57–0.95），而简单湖泊流域的年间生存率相似（0.90； 95％CI = 0.85-0.96）。相互联系的湖链中的Muskellunge运动概率在0.02至0.22范围内，在两个系统中增加，但在一个系统中降低，在整个波峰上方最大结冰水位。同样，Muskellunge每年从相互连接的湖泊链中的迁移量在0.02到0.16之间，而在一个简单的湖泊中的迁移量在0.00到0.28之间，并且在两个系统中结冰后的水位都增加。这些结果表明，随着冰水含量的升高，Muskellunge在湖内的运动和从湖中移出可能是冰川湖鱼类流失（暂时或永久）的重要原因。有关迁徙和移民的信息可以通过补充库存或减少收获配额来帮助管理人员减轻损失，