Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Strain performance evaluations are vital for developing successful fishery management and restoration strategies. Here, we utilized genotypes from 36 microsatellites to investigate hatchery strain contribution to collections of naturally produced lake trout (Salvelinus namaycush) sampled across Lake Michigan. Strain composition varied by area, with recoveries of Seneca Lake strain exceeding expectations based on stocking records in northern Lake Michigan but performing similarly to other strains in southern Lake Michigan. Interstrain hybrids were present at moderate frequencies similar to expectations based on simulations, suggesting that strains are interbreeding randomly. We hypothesize that the superior performance of the Seneca Lake strain in northern Lake Michigan is partially due to adaptive advantages that facilitate increased survival in areas with high mortality from sea lamprey (Petromyzon marinus) predation, such as northern Lake Michigan. However, when this selective pressure is lessened, the Seneca Lake strain performs similarly to other strains. Our study demonstrates that strain performance can vary across small spatial scales and illustrates the importance of conducting thorough strain evaluations to inform management and conservation.

中文翻译：

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密歇根湖中正在恢复的鳟鱼种群中新兵的遗传组成

《加拿大渔业和水生科学杂志》，印刷前。
应变性能评估对于制定成功的渔业管理和恢复策略至关重要。在这里，我们利用来自36个微卫星的基因型来研究孵化场菌株对整个密歇根湖采样的天然湖鳟（Salvelinus namaycush）集合的贡献。菌株组成因地区而异，塞内卡湖菌株的回收率超出了密歇根湖北部的放养记录，但与南部密歇根湖的其他菌株相似。品系间杂种的出现频率与基于模拟的预期相似，表明品系是随机杂交的。我们假设塞内卡湖菌株在密歇根州北部湖地区的优越性能部分归因于适应性优势，这些优势有利于在因七lamp海（Petromyzon marinus）捕食而导致高死亡率的地区（例如密歇根州北部湖）提高生存率。但是，当该选择压力降低时，塞内卡湖菌株的表现与其他菌株相似。我们的研究表明，应变性能可能会在较小的空间尺度上变化，并说明进行彻底的应变评估以告知管理和保护的重要性。