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The following schedule is subject to change (as of October 11, 2016). Please check back for updates. For more information about this meeting, go to: www.seafwa.org/conferences/2016
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Tuesday, October 18 • 8:00am - 8:20am
Fisheries. Performance of a Statistical Catch-at-age Analysis for Inconsistent Electrofishing Samples from Inland, Freshwater Fisheries

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AUTHORS: Troy M. Farmer, Auburn University; Matthew J. Catalano, Auburn University; Nicholas G. Feltz, Florida Fish and Wildlife Commission

ABSTRACT: Many management agencies across the southeastern United States inconsistently sample large reservoir sportfish populations with boat-mounted electrofishing surveys to monitor recruitment, growth, and mortality rates (i.e., vital rates). Statistical catch-at-age analysis (SCAA), which is commonly used in marine fish stock assessments but not for inland recreational fisheries, provides a platform for rigorous analysis of these inconsistent samples. However, the performance of SCAA in inland recreational fisheries has not been rigorously evaluated. Herein, we evaluate the performance of SCAA using simulated population data for two common inland sportfishes (largemouth bass, Micropterus salmoides and black crappie, Pomoxis nigromaculatus) with differing recruitment dynamics to determine the bias and accuracy of vital rates derived from SCAA. For each species, we use latitudinal variation in life-history traits (e.g., growth, mortality schedules) to evaluate the bias and accuracy of SCAA vital rate estimates for simulated populations in Southeastern and Midwestern reservoirs. We also evaluate how sampling frequency and assumptions regarding the structural form of the vulnerability-size relationships (e.g., dome-shaped, sigmoidal) and natural and fishing mortality estimates might bias vital rates. Ultimately, our results will assist management agencies in determining the optimal sampling frequency and provide insight into the sensitivity of SCAA to incorrect assumptions regarding vulnerability and mortality rates. By evaluating how well SCAA performs in response to interspecific variation in recruitment dynamics across latitudinal gradients in life-history traits, our analysis will offer a broad evaluation of the potential of SCAA models to inform management of inland, freshwater fisheries.

Tuesday October 18, 2016 8:00am - 8:20am
Riverview A

Attendees (7)