Lake sturgeon (Acipenser fulvescens) have been negatively impacted by barriers to migration, pollution and overharvest. Biological data such as the timing of spawning activity and larval drift have provided a better understanding of larval production success or failure on a site‐specific basis. However, many river systems that serve as reproductive locations for remnant lake sturgeon populations remain understudied. The objective of this study was to compare and contrast aspects of larval lake sturgeon drift within and between the Oconto and Menominee Rivers over multiple reproductive seasons. Differences in larval drift chronology, the size of drifting larvae during the season and the cross‐sectional profile of drifting individuals as a function of river velocity were evaluated. D‐frame drift nets were deployed at a single transect below spawning sites in the Menominee (2012, 2013 and 2014) and Oconto Rivers (2013, 2014 and 2015). A total of 4,442 larvae were captured across all seasons. Larvae exhibited nonrandom drift profiles related to water velocity, and larvae size was related to horizontal drift location. The seasonal increase in body size of drifting larvae also differed among drift events within and between years and across rivers. This information will provide a better understanding of lake sturgeon early life history and has practical management connections including spawning site protection/enhancement and river flow mitigation.

中文翻译：

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威斯康星州梅诺米尼河和奥康托河的幼体lake鱼生产和漂流行为

st鱼（Acipenser fulvescens）受到移民，污染和过度收获的壁垒的负面影响。产卵活动时间和幼虫漂移的时间等生物学数据可以更好地了解特定地点的幼虫生产成败。但是，许多作为剩余lake鱼种群繁殖地的河流系统仍未得到充分研究。这项研究的目的是比较和对比多个繁殖季节奥康托河和梅诺米妮河之间以及之间的幼体湖st鱼漂泊情况。评估了幼虫漂流时间顺序，季节内漂流幼虫的大小以及漂流个体的横截面随河速变化的差异。D-frame流动网被部署在Menominee产卵点下方的一个样带中（2012年，2013年和2014年）和奥康托河（2013年，2014年和2015年）。在所有季节中，共捕获了4,442个幼虫。幼虫表现出与水流速度有关的非随机漂移曲线，幼虫大小与水平漂移位置有关。漂流幼虫的体型季节性增加在年份之间和年份之间以及河流之间的漂流事件之间也有所不同。这些信息将使人们更好地了解lake鱼的早期生活史，并具有实际的管理联系，包括产卵地点的保护/增强和河水的缓解。漂流幼虫的体型季节性增加在年份之间和年份之间以及河流之间的漂流事件之间也有所不同。这些信息将使人们更好地了解lake鱼的早期生活史，并具有实际的管理联系，包括产卵地点的保护/增强和河水的缓解。漂流幼虫的体型季节性增加在年份之间和年份之间以及河流之间的漂流事件之间也有所不同。这些信息将使人们更好地了解lake鱼的早期生活史，并具有实际的管理联系，包括产卵地点的保护/增强和河水的缓解。