Abstract
Stock assessments based on catch per unit effort (CPUE), relative weight (Wr), and proportional stock density (PSD) were conducted on 18 populations of pejerrey in pampean lakes ofeastern Argentina. The CPUE ofgill nets ranged from 2.9 to 435.2 kg/net-night and was correlated with zooplankton biomass (r = 0.68; P < 0.01). The average Wr (the ratio of empirical weight to a “standard” weight for a fish of the same size, expressed as a whole number) of designated size-groups ranged from 68 to 119. Low Wr was apparent in all size-groups in two lakes with high inorganic turbidity and in one hypertrophic lake with a chlorophyll-a concentration higher than 400 μg/L. Among all the lakes, the PSD (the proportion of fish of “quality” size in a stock, expressed as a percentage) ranged from 0 to 90 and was not related to Wr of any size-group. The indices of CPUE and PSD provided useful criteria to define five types of pejerrey populations and propose minimum size or slot length limit regulations for harvest management. These evaluations and recommendations represent major challenges and opportunities for the development of fishery management plans in Argentina.
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