Long-term tagging reveals variable escapement of stocked Muskellunge among four Ohio reservoirs: Consequences for managing reservoir fisheries

IF 2.2 2区农林科学 Q2 FISHERIES

Fisheries Research Pub Date : 2024-11-30 DOI:10.1016/j.fishres.2024.107230

Kevin S. Page , Curtis P. Wagner

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引用次数: 0

Abstract

Muskellunge Esox masquinongy are stocked by the Ohio Department of Natural Resources, Division of Wildlife (ODNR-DOW) into nine reservoirs to create trophy fisheries. Escapement is recognized as a potential impediment to maintaining quality fisheries in these reservoirs. We evaluated the escapement of Muskellunge at four reservoirs using mark-recapture methods during 2013–2022. At each reservoir, all juvenile Muskellunge (254–305 mm) stocked during 2013–2018 were implanted with passive-integrated-transponder (PIT) tags prior to release. In addition, adult mark-recapture sampling events were conducted by the ODNR-DOW during 2019–2022 to check for tagged fish and implant untagged fish. Muskellunge anglers were also outfitted with handheld PIT readers to scan and report tagged fish during the study. Escapement was monitored continuously with PIT tag detection systems installed within dam spillways. We used multi-state (in-reservoir vs escaped) mark-recapture models to estimate annual escapement for juvenile (≤ age 1) and adult Muskellunge. A total of 51,826 fish were tagged (51,052 juveniles, 774 adults), resulting in 3428 detections (2316 individuals). The number of Muskellunge escaping varied widely among reservoirs (0–481). Most escapement (85 %) occurred during the spring (March–May). Nearly all (96 %) known age fish that escaped were age 3 or greater. Modelling revealed that annual probability of juvenile escapement (≤ 0.02) was likely inconsequential at all reservoirs. However, adult escapement was highly variable among reservoirs (mean = 0–0.34). Escapement was lowest at reservoirs where water levels are managed via offshore sluice-gate tower structures, and greatest at locations where surface water is discharged from along-shore structures (i.e., crest gates and unregulated spillway). Where escapement occurred, there was a negative relationship between the annual probability of escapement and fishing success. Results will be useful for informing stocking strategies, mitigating fish loss, and managing fishery expectations.

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长期标记揭示了俄亥俄州四个水库中储存的马斯克尔龙格的可变逃逸：管理水库渔业的后果

俄亥俄州自然资源部野生动物部（ODNR-DOW）在9个水库中储存了Muskellunge Esox masquinongy，以创造狩猎渔业。疏浚被认为是在这些水塘维持优质渔业的潜在障碍。在2013-2022年期间，我们使用标记-重新捕获方法评估了四个水库的Muskellunge擒擒度。在每个水库，2013-2018年期间储存的所有Muskellunge幼鱼（254-305 mm）在释放前都植入了被动集成应答器（PIT）标签。此外，ODNR-DOW在2019-2022年期间进行了成鱼标记重新捕获抽样活动，以检查标记鱼和未植入标记的鱼。在研究期间，Muskellunge垂钓者还配备了手持式PIT阅读器来扫描和报告标记的鱼。通过安装在大坝泄洪道内的PIT标签检测系统，对擒纵情况进行了连续监测。我们使用多状态（水库内vs逃逸）标记-再捕获模型来估计幼年（≤1岁）和成年Muskellunge的年逃逸量。共对51,826条鱼（51,052条幼鱼，774条成鱼）进行了标记，共发现3428条（2316条）。Muskellunge逸出的数量在不同的水库之间差异很大（0-481）。大多数擒纵（85% %）发生在春季（3 - 5月）。几乎所有（96% %）已知年龄的鱼都是3岁或更大。模型显示，在所有水库中，年幼鱼逃逸概率（≤0.02）可能无关紧要。不同水库间成虫擒纵度差异较大（平均值为0 ~ 0.34）。在通过近海闸门塔结构管理水位的水库中，擒纵度最低，而在地表水从沿岸结构（即波峰闸门和无管制溢洪道）排放的地点，擒纵度最大。在发生越轨的地方，越轨的年概率与捕捞成功呈负相关。研究结果将有助于制定放养战略、减轻鱼类损失和管理渔业预期。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fisheries Research 农林科学-渔业

CiteScore

4.50

自引率

16.70%

发文量

294

审稿时长

15 weeks

期刊介绍： This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.