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Abstract (from http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2014-0394#.Vc36E_lVikp): Understanding variability in fish production, biomass, production/biomass ( P/ B) ratios, and their relationship to exploitation is central to fisheries sustainability. At Escanaba Lake, Wisconsin, USA, data from a compulsory creel census (1965–2009) were combined with survey data on fish populations to test for empirical relationships between annual production and exploitation rates of walleye ( Sander vitreus). Empirical estimates of walleye production were relatively high and temporally variable in Escanaba Lake. Annual production, biomass, and P/ B ratios ranges were 2.4–11.3 kg·ha −1·year −1, 9.1–49.4 kg·ha −1, and...
Categories: Publication;
Types: Citation;
Tags: Data Visualization & Tools,
Fish,
Fisheries,
National CASC,
Rivers, Streams and Lakes, All tags...
Science Tools For Managers,
Walleye,
Water, Coasts and Ice,
Wildlife and Plants, Fewer tags
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Abstract (from NRC Research Press): Walleye (Sander vitreus) populations are declining in Wisconsin and neighboring regions, motivating broader interest in walleye biology amidst ecological change. In fishes, growth integrates variation in ecological drivers and provides a signal of changing ecological conditions. We used a 23-year data set of length-at-age from 353 walleye populations across Wisconsin to test whether walleye growth rates changed over time and what ecological factors best predicted these changes. Using hierarchical models, we tested whether spatiotemporal variation in walleye growth was related to adult walleye density (density-dependent effects), water temperature, and largemouth bass (Micropterus...
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