Abstract After 42 years of stocking in Lake Champlain, recruitment of wild juvenile lake trout (Salvelinus namaycush) was first observed in 2015. Abundance of wild lake trout juveniles was spatially heterogeneous. Recruitment of wild fish to age-1 and subsequent survival are likely related to growth including overwinter growth. We hypothesized that growth potential or growth-related mortality of wild and stocked fish may explain spatial differences in abundance. We collected juvenile (age-0 to 3) lake trout by bottom trawling in the central, north, and south Main Lake every 2–4 weeks during the ice-free season, 2015–2018. The percentage of wild juveniles increased from 27.8% of the total catch in 2015 to 65.7% in 2018. Rates of growth in length and change in condition were compared in wild versus stocked lake trout, among sampling areas, and between seasons (sampling season relative to winter). Wild juveniles grew equally or faster in length than stocked juveniles at the same age, but changed more slowly in condition. There was a higher percentage of wild juveniles in the central sampling area than the north and south, but no differences in growth among sampling areas. Wild and stocked fish grew in length over winter, but most cohorts (6 of 7) maintained or increased condition. Results indicate high growth potential of wild juvenile lake trout and progress toward population restoration.

中文翻译：

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尚普兰湖野生和放养湖鳟幼鱼生长的空间和季节比较

摘要 在尚普兰湖放养 42 年后，2015 年首次观察到野生湖鳟幼鱼（Salvelinus namaycush）的招募。野生湖鳟幼鱼的丰度在空间上具有异质性。将野生鱼招募到 1 岁和随后的存活可能与生长有关，包括越冬生长。我们假设野生和放养鱼类的生长潜力或与生长相关的死亡率可以解释丰度的空间差异。在 2015 年至 2018 年的无冰季节，我们每 2 至 4 周在主湖中央、北部和南部通过底拖网捕捞幼鱼（0 至 3 岁）。野生幼鱼的百分比从 2015 年占总捕获量的 27.8% 增加到 2018 年的 65.7%。 比较了野生和放养湖鳟的长度增长率和状况变化率，在采样区域中，和季节之间（相对于冬季的采样季节）。野生幼鱼的长度与相同年龄的放养幼鱼相同或更快，但状况变化更慢。中部采样区野生幼鱼的比例高于北部和南部，但采样区之间的生长没有差异。野生和放养的鱼在冬天的长度增加，但大多数队列（7 个中的 6 个）保持或增加了条件。结果表明野生幼年湖鳟的高生长潜力和种群恢复的进展。但采样区域之间的增长没有差异。野生和放养的鱼在冬天的长度增加，但大多数队列（7 个中的 6 个）保持或增加了条件。结果表明野生幼年湖鳟的高生长潜力和种群恢复的进展。但采样区域之间的增长没有差异。野生和放养的鱼在冬天的长度增加，但大多数队列（7 个中的 6 个）保持或增加了条件。结果表明野生幼年湖鳟的高生长潜力和种群恢复的进展。