Movement of Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) and lake sturgeon (A. fulvescens) in the St. Lawrence Estuary (Québec, Canada) are not fully understood. To assess the movement extent of both species, a mark–recapture study was conducted in collaboration with commercial fishermen operating in the St. Lawrence Estuary. Between 1981 and 2015, 3,367 Atlantic sturgeon (fork length 21.8–199.5 cm) and 3,180 lake sturgeon (fork length 17.8–190.8 cm) were tagged and released. Of these, 673 Atlantic sturgeon and 42 lake sturgeon were recaptured. The maximum distances traveled between capture and recapture locations were 1,307 km for Atlantic sturgeon (8 years after initial capture) and 252 km for lake sturgeon (less than 1 year after initial capture). Statistical analyses identified differences in the dispersal distance of both species as revealed by a first component characterized by individuals with short dispersal distances (98% and <35 km for Atlantic sturgeon; 58% and <1 km for lake sturgeon) and a second component characterized by individuals with longer dispersal distances (2% and >600 km for Atlantic sturgeon; 42% and >190 km for lake sturgeon). We suggest that the short dispersal distances detected in the vast majority of Atlantic sturgeon recaptures likely reflect strong site fidelity, highlighting the importance of the St. Lawrence Estuary as a preferred habitat for juveniles and subadults. Although recaptures were low for lake sturgeon because this species is only marginally targeted by commercial fishermen in the St. Lawrence Estuary, our results also showed that this species uses estuarine habitats and that half of the population seems to exhibit strong site fidelity (67% of individuals were recaptured within 2 km).

中文翻译：

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鲟鱼（Acipenser oxyrinchus oxyrinchus 和 A. fulvescens）在圣劳伦斯河口的运动：一项为期 35 年的标记研究

大西洋鲟（Acipenser oxyrinchus oxyrinchus）和湖鲟（A. fulvescens）的运动在圣劳伦斯河口（加拿大魁北克省）尚未完全了解。为了评估这两个物种的运动范围，与在圣劳伦斯河口作业的商业渔民合作进行了一项标记-重新捕获研究。1981 年至 2015 年间，3,367 条大西洋鲟（叉长 21.8-199.5 厘米）和 3,180 条湖鲟（叉长 17.8-190.8 厘米）被标记和释放。其中，673条大西洋鲟鱼和42条湖鲟被重新捕获。大西洋鲟的捕获和重新捕获位置之间的最大距离为 1,307 公里（初次捕获后 8 年），湖鲟为 252 公里（初次捕获后不到 1 年）。统计分析确定了两种物种的传播距离的差异，这由第一部分所揭示，其特征是传播距离较短的个体（大西洋鲟为 98% 和 <35 公里；湖鲟为 58% 和 <1 公里），第二部分特征为分布距离较长的个体（大西洋鲟为 2% 和 >600 公里；湖鲟为 42% 和 >190 公里）。我们认为，在绝大多数大西洋鲟重新捕获中检测到的短分散距离可能反映了强烈的现场保真度，突出了圣劳伦斯河口作为幼鱼和亚成鱼的首选栖息地的重要性。尽管湖鲟的重新捕获率很低，因为该物种只是圣劳伦斯河口商业渔民的小目标，