Recruitment of age‐0 Walleye Sander vitreus is often indexed using fall electrofishing surveys. However, collecting fish before fall may provide timely information regarding stocking decisions and factors influencing recruitment. We evaluated sampling methods for age‐0 Walleye in northern Wisconsin lakes that could be used to assess recruitment in spring and summer. Initial assessments on two lakes indicated surface tows of ichthyoplankton nets at night during May to early June and 0.64‐cm‐micromesh gill nets set in July provided the highest catches of age‐0 Walleye among the methods we evaluated. Additional sampling on 13 lakes over 2 years indicated catch per effort (CPE) of age‐0 Walleye using these two methods did not correlate with age‐0 CPE in fall electrofishing. However, presence or absence of age‐0 Walleye in micromesh gill nets was 92% accurate in predicting whether age‐0 CPE in fall electrofishing was ≥15 fish/h, the threshold above which eventual recruitment to the fishery is expected to occur. Micromesh gill netting may provide a useful tool for allocating fingerling Walleye that are stocked in fall, a resource that is often limited due to space and forage constraints associated with propagation. Additionally, our sampling protocol may help to identify timing of potential recruitment bottlenecks occurring in some lakes.

中文翻译：

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在秋天之前对威斯康星州北部湖泊的0岁角膜白鲑丰度进行索引

招募0岁的Walleye Sander玻璃体通常使用秋季电钓鱼调查来编制索引。但是，在秋季之前收集鱼类可能会及时提供有关放养决定和影响招募的因素的信息。我们评估了威斯康星州北部湖泊0岁角膜白斑的采样方法，该方法可用于评估春季和夏季的募集。对两个湖泊的初步评估表明，在5月至6月初的晚上，鱼鳞浮游生物网的表面被拖曳，而在7月设置的0.64 cm微网状刺网在我们评估的方法中提供了0岁角膜白斑鱼的最高捕获率。在2年中对13个湖泊进行的额外采样表明，使用这两种方法的0岁角膜白鲑的单次捕获量（CPE）与秋季电钓鱼中0岁角膜的CPE无关。然而，在微网状刺网中是否存在0岁年龄的角膜白斑，在预测秋季电钓鱼中0岁年龄段的CPE是否≥15鱼/小时时，准确度为92％，这是最终可能招募到该渔业的阈值。Micromesh may网可为分配秋季储备的鱼种角膜白斑提供有用的工具，该种资源由于与繁殖相关的空间和草料限制而经常受到限制。此外，我们的采样协议可能有助于确定在某些湖泊中发生的潜在招聘瓶颈的时机。通常由于与传播相关的空间和草料限制而受到限制的资源。此外，我们的采样协议可能有助于确定在某些湖泊中发生的潜在招聘瓶颈的时机。通常由于与传播相关的空间和草料限制而受到限制的资源。此外，我们的采样协议可能有助于确定在某些湖泊中发生的潜在招聘瓶颈的时机。