Production rates of walleye and their relationship to exploitation in Escanaba Lake, Wisconsin, 1965–2009

Rypel, Andrew L.; Goto, Daisuke; Sass, Greg G.; Zanden, M. Jake Vander

doi:10.1139/cjfas-2014-0394

Cited by 24 publications

(52 citation statements)

References 70 publications

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“…(), Rypel et al. (), and Tsehaye et al. (), which focus on target exploitation reference points, may suggest that the total allowable catch and limit reference point for CTWI Walleyes be lowered to decrease overall exploitation and compensate for long‐term declines in natural recruitment and productivity (Hansen et al.…”

Section: Discussionmentioning

confidence: 99%

“…Rypel et al. () also suggested that exploitation rates >20% led to the harvest of all Walleye annual surplus production in Escanaba Lake, Wisconsin (the most productive Walleye lake in the CTWI; Rypel et al., in press), and Tsehaye et al. () showed that exploitation rates >20% on a simulated regional CTWI Walleye population reduced adult density to <7.4 fish/ha using a hierarchical Bayesian statistical catch‐at‐age model.…”

Section: Discussionmentioning

confidence: 99%

“…Lastly, Rypel et al. () and Tsehaye et al. () suggested that sustainable exploitation rates (target reference points) for CTWI Walleye populations should not exceed 20% using estimates of Walleye production and a hierarchical Bayesian statistical catch‐at‐age model, respectively.…”

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confidence: 99%

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Walleye Population Responses to Experimental Exploitation in a Northern Wisconsin Lake

Sass

Shaw

2018

Trans Am Fish Soc

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Understanding how fish populations respond to exploitation is critical for sustainable fisheries management. Walleye Sander vitreus have been exploited by tribal spear and angling fisheries in the Ceded Territory of Wisconsin (CTWI) since 1985, and harvest in individual lakes has been regulated using a 35% adult exploitation limit reference point since 1990. We conducted a 35% annual adult Walleye exploitation experiment (1993–1997: baseline exploitation at ~13%; 1998–2008: 35% exploitation) on Big Crooked Lake, Wisconsin, to test for responses in adult, male, female, age‐0, and age‐1 density and sex‐specific mean length at age and proportional size distribution (PSD) indices. Adjacent Wolf Lake was used as the reference system. Adult Walleye density in Big Crooked Lake declined significantly between exploitation periods and was due to the experiment. Adult Walleye density declined from about 16 to 10 fish/ha and was about 7 fish/ha during 2001–2008. Male density declined significantly between exploitation periods, whereas female density did not change. Age‐0 and age‐1 density did not change as a result of the experiment. Male and female mean length at age across several age‐classes increased significantly over time. The PSD indices did not change over time for males, but female PSD‐Quality and PSD‐Preferred increased significantly. Our results suggest that sustained 35% annual exploitation on the Big Crooked Lake Walleye population led to an undesirable adult density (≤7.4/ha) but improved growth. Walleye recruitment did not change in Big Crooked Lake under sustained exploitation; however, we caution that other CTWI populations may respond differently to this level of targeted exploitation. Based on our results, long‐term declines in CTWI Walleye natural recruitment and productivity, and as suggested by other independent studies, we recommend that the limit reference point be lowered to reduce exploitation and be protective of all Walleye populations in the CTWI.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Walleye Population Responses to Experimental Exploitation in a Northern Wisconsin Lake

Sass

Shaw

2018

Trans Am Fish Soc

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“…, Rypel et al. ). Thus, studies of production rates and biomass represent a natural conceptual bridge between these two, often‐segregated scientific fields.…”

Section: Introductionmentioning

confidence: 98%

Pattern and scale in latitude–production relationships for freshwater fishes

Rypel

David

2017

Ecosphere

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Abstract. Empirically understanding spatial variation in secondary production rates is central to ecology. Yet for most taxa, such patterns are rarely examined, especially at different levels of ecological organization (e.g., species-vs. community-level patterns). We compiled data on biomass, production, and P/B rates of freshwater fish communities and species across latitudes and contrast patterns observed at the community level with those observed for species. At the community level, and at two distinct spatial scales (global vs. continental-North American), negative or neutral relationships were apparent between biomass, production, and P/B with latitude; however, there was substantial scatter in these data. Yet at the species level in North America, production was often closely linked to latitude, but in the opposite direction: Many species showed improved production with latitude. Latitudinal increases in species-level production rates were strongest for cool-and cold-water species, and species rarely showed the opposite trend. Species-level increases in production with latitude strengthened when production rates were normalized by the thermal opportunity for production, suggesting potential adaptations of individuals and populations to shorter growing seasons (i.e., "countergradient" production) at high latitudes. At the global scale, there were apparent unimodal relationships between community fish production measures and species richness; however, these patterns became linearized or non-significant at the continental scale. Decreased interspecific competition at northern latitudes combined with genetic adaptations (e.g., countergradient growth) could explain a tendency for increased species production in northern populations, while total community production remains reduced. Latitude has contrasting effects on fish production at different spatial scales and levels of biological organization. Thus while freshwater fish communities are somewhat more productive and diverse at lower latitudes, species production in northern populations is often surprisingly high.

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“…Annual population estimates were converted to age-specific population values by 232 estimating the proportion of the population in different age classes (Rypel et al 2015). Annual production statistics for cisco in Trout Lake were highly variable over We found that production of cisco in Trout Lake exhibited considerable decline 333 until 2011.…”

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confidence: 90%

Predator–prey dynamics mediate long-term production trends of cisco (Coregonus artedi) in a northern Wisconsin lake

Parks

Rypel

2018

Can. J. Fish. Aquat. Sci.

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We quantified production, biomass, and production to biomass (P/B) ratios for cisco (Coregonus artedi) in Trout Lake, Wisconsin, USA (2001–2015). Across all years, annual production, biomass, and P/B were variable ranging 0.6–30.2 kg·ha−1·year−1, 1.2–39.7 kg·ha−1, and 0.4–0.9·year−1, respectively. Cisco production exhibited obvious decline. However, neither biomass nor P/B changed significantly over time. Long-term patterns of environmental conditions remained unchanged during the study and were unrelated to cisco production. However, lake trout (Salvelinus namaycush) relative abundance showed a strong inverse relationship with cisco production and biomass. Intense lake trout stocking has occurred in this lake over time to conserve a genetically unique strain of the species. These management efforts may have had the unintended consequence of amplifying top-down predation on cisco. Since cisco P/B has gone largely unchanged, cisco production would be predicted to rebound quickly to adaptive reductions in lake trout stocking. Further increases in lake trout numbers could place both populations at risk of collapse. This study provides an example of a fisheries production approach for understanding and conserving cold-water fisheries, especially in lakes dominated by ciscoes.

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Production rates of walleye and their relationship to exploitation in Escanaba Lake, Wisconsin, 1965–2009

Cited by 24 publications

References 70 publications

Walleye Population Responses to Experimental Exploitation in a Northern Wisconsin Lake

Walleye Population Responses to Experimental Exploitation in a Northern Wisconsin Lake

Pattern and scale in latitude–production relationships for freshwater fishes

Predator–prey dynamics mediate long-term production trends of cisco (Coregonus artedi) in a northern Wisconsin lake

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