Abstract Perrion MA, Kaemingk MA, Koupal KD, Schoenebeck CW, Bickford NA. 2019. Use of otolith chemistry to assess recruitment and habitat use of a white bass fishery in a Nebraska reservoir. Lake Reserv Manage. 36:64–74. Managing fisheries that exhibit variable annual recruitment is challenging, and maintenance stockings are often prescribed to minimize interannual population variation. Maintenance stockings are costly and may not be necessary if sufficient natural recruitment is occurring. Therefore, developing tools and techniques that can collectively assess hatching origin and subsequent habitat use of individuals would be valuable. Herein, we aimed to assess the efficacy of otolith chemistry techniques to (1) determine whether there was evidence of natural recruitment within an annually stocked white bass population and (2) examine the potential to describe spatial reservoir use of these age-0 fish. A sample of hatchery-produced fingerling white bass (n = 17) was retained from a larger June 2015 stocking of white bass in Lake McConaughy, Nebraska, to characterize the hatchery fish natal elemental signatures. Age-0 white bass (n = 100) were then collected in Lake McConaughy in September 2015 from 2 sections of the reservoir (upper and main) to assess both natal origin (hatchery versus natural) and habitat use (upper versus main) using otolith concentrations of 5 chemical constituents at the otolith core and otolith edge, respectively. Otolith core signatures from the fall age-0 Lake McConaughy collected fish were different from the hatchery fish, indicating evidence for natural white bass recruitment. Otolith edge signatures were also distinct between fish collected from the upper and main sections of the reservoir. Otolith chemistry techniques can be useful for addressing challenges associated with managing erratic recruiting fish populations that are common to lake and reservoir systems.

中文翻译：

---

使用耳石化学来评估内布拉斯加州水库中白鲈渔业的补充和栖息地利用

摘要 Perrion MA、Kaemingk MA、Koupal KD、Schoenebeck CW、Bickford NA。2019. 使用耳石化学评估内布拉斯加州水库白鲈渔业的补充和栖息地利用。湖泊保护区管理。36:64-74。管理显示出每年变化的渔业具有挑战性，并且经常规定维护放养以尽量减少年际种群变化。维护袜是昂贵的，如果发生足够的自然补充，则可能没有必要。因此，开发能够共同评估孵化起源和随后个体栖息地使用的工具和技术将是有价值的。在此处，我们旨在评估耳石化学技术的功效，以 (1) 确定在每年放养的白鲈种群中是否存在自然补充的证据，以及 (2) 检查描述这些 0 岁鱼的空间水库使用的潜力。从 2015 年 6 月在内布拉斯加州麦康纳湖放养的更大的白鲈鱼中保留了孵化场生产的白鲈鱼种（n = 17）样本，以表征孵化场鱼类的出生元素特征。然后于 2015 年 9 月在麦康纳湖的 2 个水库部分（上部和主要）收集了年龄 0 白鲈鱼（n = 100），以使用耳石评估出生起源（孵化场与自然）和栖息地使用（上部与主要）分别在耳石核心和耳石边缘的 5 种化学成分的浓度。来自麦康纳秋季 0 岁湖收集的鱼的耳石核心特征与孵化鱼不同，表明天然白鲈补充的证据。从水库上部和主要部分收集的鱼之间的耳石边缘特征也很明显。耳石化学技术可用于解决与管理湖泊和水库系统常见的不稳定招募鱼类种群相关的挑战。