To inform lake trout (Salvelinus namaycush) fishery management in Lake Huron that has undergone rapid ecosystem changes, we quantified lake trout production dynamics by coupling age-structured stock assessment and fish bioenergetics models. Our approach revealed the connection between piscivore production and prey consumption, included growth compensation to reproduction losses, and allowed comparisons between long-term dynamics of fishery harvests and fish production. We found that, despite the collapse of alewives, a major non-native pelagic prey fish, lake trout production appeared to be sustainable. To a certain degree, the effect of recent recruitment declines on lake trout production was offset by the release of harvest pressure from subadult lake trout and reduction in fishing and sea lamprey-induced mortality on adult lake trout. Evidence for sustainability also included the finding that no changes in average ratios of annual production to beginning-of-the-year biomass. Juvenile P:B ratio remained as high as 2.1. The effect of growth declines on adult and subadult production was offset by reduction in population mortality. Body growth and condition did not continue to decline when lake trout became more and more reliant on round goby as food, and the dynamics of total consumption of prey fish continued to be recipient controlled.

中文翻译：

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休伦湖主流域鳟鱼生产动态

通知鳟鱼（Salvelinus namaycush）休伦湖的渔业管理经历了快速的生态系统变化，我们通过结合年龄结构的种群评估和鱼类生物能学模型来量化鳟鱼的生产动态。我们的方法揭示了食肉动物生产与猎物消费之间的联系，包括对繁殖损失的增长补偿，并允许在渔业收成和鱼类生产的长期动态之间进行比较。我们发现，尽管鲜虾（一种主要的非原生上层捕食鱼）倒闭，但湖鳟的生产似乎是可持续的。在一定程度上，最近的招聘减少对湖鳟鱼产量的影响被亚成年湖鳟鱼收获压力的释放以及成年湖鳟鱼捕捞和海七lamp鳗引起的死亡率的降低所抵消。可持续性的证据还包括发现年产量与年初生物量的平均比率没有变化。少年P：B比例仍高达2.1。生长下降对成年和亚成年生产的影响被人口死亡率的降低所抵消。当湖鳟越来越依赖轮虾作为食物时，身体的生长和状况没有继续下降，并且猎食鱼总消费的动态继续受到受者控制。