Stocking Walleye Sander vitreus is a common management tool to augment populations where natural reproduction is limited. Some hatcheries have progressively raised larger fingerling Walleye to improve poststocking survival; however, little is known about the poststocking survival and behavior of large fingerling Walleye. We sought to evaluate the poststocking daily apparent survival, depth use, dispersal, and home range size of large fingerling Walleye (>200 mm TL) in three Iowa, USA, lakes. Walleye (209–265 mm; n = 15 per lake [45 fish total]) were implanted with radio tags, stocked on October 26–30, 2017, and tracked until May 30, 2018. Cormack–Jolly–Seber recapture models estimated that Walleye apparent survival increased with days poststocking and fish length, resulting in 76% (95% CI = 44–89%) cumulative survival by May. Walleye in Brushy Creek Lake were located in deeper water (mean ± SE = 5.1 ± 0.2 m) than those in Big Creek Lake (3.3 ± 0.2 m) or East Okoboji Lake (1.7 ± 0.1 m), but depth use did not vary with days poststocking. Walleye dispersed an average of 1,355 ± 234 m within 13 d across all lakes, with home range size being larger in Big Creek Lake (mean ± SE = 67.9 ± 21.7 ha) than in Brushy Creek Lake (15.5 ± 15.7 ha) or East Okoboji Lake (31.0 ± 14.0 ha). Our results indicate that Walleye poststocking survival is high overall, with most mortality occurring within 20 d as Walleye are dispersing, suggesting that managers should focus on improving survival during this critical period to improve stocking success.

中文翻译：

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使用放射遥测技术评估美国三个衣阿华州湖泊的大型鱼种角膜白鲑的放养存活和行为

放养角膜白斑玻璃体是增加自然繁殖受限人群的常用管理工具。一些孵化场逐渐养成较大的鱼种角膜白斑以提高放养后的存活率。但是，对于大鱼种角膜白斑的后期放养存活和行为知之甚少。我们试图评估美国爱荷华州三个湖泊中大型鱼种角膜白斑（> 200 mm TL）的放养后每日表观存活率，深度使用，扩散和家庭范围大小。角膜白斑（209-265毫米；n =每个湖15个鱼（总共45条鱼））被植入无线电标签，于2017年10月26日至30日放养，并一直追踪到2018年5月30日。Cormack–Jolly–Seber捕捞模型估计，Walleye的表观存活率随放养和捕捞天数的增加而增加。鱼的长度，到5月导致76％（95％CI = 44–89％）的累积存活率。相比于大溪湖（3.3±0.2 m）或东奥科波吉湖（1.7±0.1 m）的水域，Brushy Creek湖的角膜白斑位于更深的水中（平均±SE = 5.1±0.2 m），但深度的使用并没有变化放养后的天数。角膜白斑在13 d内在所有湖泊中平均分散了1,355±234 m，Big Creek湖的家园面积（平均±SE = 67.9±21.7公顷）要大于Brushy Creek湖（15.5±15.7公顷）或东Okoboji湖（31.0±14.0公顷）。我们的结果表明，Walleye的后期库存生存率总体较高，