Spatial patterning of walleye recreational harvest in Lake Erie: Role of demographic and environmental factors

Dippold, David A.; Adams, Grant; Ludsin, Stuart A.

doi:10.1016/j.fishres.2020.105676

Cited by 11 publications

(29 citation statements)

References 101 publications

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“…Our fi ndings that using a charter service, trip length, month, number of anglers, time of day, and day of the week were associated with Walleye catch is supported by previous research in Lake Erie and other ecosystems (Su and He 2013 ;Bailey et al 2019 ;Dippold et al 2020 ). However, our analysis also revealed that the relative performance of casting and trolling varied among months and basins, likely owing to seasonal migrations of Walleye (Wang et al 2007 ;Raby et al 2018 ).…”

Section: Total Walleye Catchsupporting

confidence: 87%

Fisheries Volume 47 Number 5 May 2022

2022

Fisheries

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know-how, including supporting landowner partnerships, only increases project effectiveness. If we want to see globally impactful reduction of our carbon output, prioritizing local collaborations and community level objectives are critical to maximizing the cumulative effect of our efforts. Locally adapted efforts are more likely to refl ect the nuances of regional ecology, human demographics, and cultural practices than broad, one-size-fi ts-all programs. I encourage you to engage with local planning efforts to help planners see possible paths that incorporate fi sheries, water, and climate in their designs. Your understanding of local species, watersheds, and offshore systems can be valuable factors in plotting a best course forward. REFERENCE McLanaghan , S. 2021 . FMIG Presentation 1. Climate-smart mitigation for UK fi sheries . Seafi sh (October 12). Available: https://bit.ly/3LkNAhe . (March 2022).

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Section: Total Walleye Catchsupporting

confidence: 87%

Fisheries Volume 47 Number 5 May 2022

2022

Fisheries

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“…These annual movements have been hypothesized to be associated with such as thermoregulation (Raby et al 2018) and prey availability (Kershner et al 1999). Therefore, interannual variation in water temperature could influence the timing of spawning and subsequent eastward migration of west basin walleye which in turn could drive harvest dynamics (Dippold et al 2020). Similarly, changes in abundance of preferred forage fishes (e.g., emerald shiner Notropis atherinoides , rainbow smelt Osermerus mordax ) may also influence migratory tendencies of western basin walleye.…”

Section: Discussionmentioning

confidence: 99%

“…For instance, western basin walleye stocks more strongly selected depths > 13 m than did their eastern basin counterparts, suggesting that there could be potential for differential exposure to commercial and recreational fisheries (Matley et al 2020). Similarly, in years when eastward migration is either delayed or limited, eastern basin stocks may be exploited to a higher degree (Dippold et al 2020). Exploitation of individual stocks may also vary among years owing to differences in stock productivity and recruitment success for eastern and western basin stocks.…”

Section: Stock Contributions To Eastern Basin Fisheriesmentioning

confidence: 99%

Mixed-stock analysis in the age of genomics: Rapture genotyping enables evaluation of stock-specific exploitation in a freshwater fish population with weak genetic structure

Euclide

MacDougall

et al. 2020

Preprint

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Mixed-stock analyses using genetic markers have informed fisheries management in cases where strong genetic differentiation occurs among local spawning populations, yet many fisheries are supported by multiple spawning stocks that are weakly differentiated. Freshwater fisheries exemplify this problem, with many harvested populations supported by multiple stocks of young evolutionary age that are isolated across small spatial scales. As a result, attempts to conduct genetic mixed-stock analyses of inland fisheries have often been unsuccessful. Advances in genomic sequencing now offer the ability to discriminate among populations with weak population structure by providing the necessary resolution to conduct mixed-stock assignment among previously indistinguishable stocks. We demonstrate the use of genomic data to conduct a mixed-stock analysis of Lake Erie’s commercial and recreational walleye (Sander vitreus) fisheries and estimate the relative harvest of weakly differentiated stocks (pairwise FST < 0.01). We used RAD-capture (Rapture) to sequence and genotype individuals at 12,081 loci that had been previously determined to be capable of discriminating between western and eastern basin stocks with 95% reassignment accuracy, which was not possible in the past with microsatellite markers. Genetic assignment of 1,075 fish harvested from recreational and commercial fisheries in the eastern basin indicated that western basin stocks constituted the majority of individuals harvested during peak walleye fishing season (July – September). Composition of harvest changed seasonally, with eastern basin fish comprising much of the early season harvest (May – June). Clear spatial structure in harvest composition existed; more easterly sites contained more individuals of east basin origin than did westerly sites. Our study provides important stock contribution estimates for Lake Erie fishery management and demonstrates the power of genomic data to facilitate mixed-stock analysis in exploited fish populations with weak population structure or limited existing genetic resources.

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“…The contribution of west/central basin stocks to eastern basin fisheries was predicted to be large based on previous estimates suggesting that greater than 90% of the harvest in the eastern basin comes from western basin stocks (Walleye Task Group, 2018;Zhao et al, 2011 The magnitude and extent of annual migrations have been hypothesized to be associated with western basin population size (Zhao et al, 2011) water temperature (Raby et al, 2018), and prey availability (Kershner et al, 1999). Therefore, interannual variation in these factors likely drives walleye distribution and harvest dynamics throughout Lake Erie (Dippold, Adams, et al, 2020). In years when eastward migration is either delayed or limited, eastern basin stocks may be exploited to a higher degree (Dippold, Aloysius, et al, 2020).…”

Section: Stock Contributions To Eastern Basin Fisheriesmentioning

confidence: 99%