Growth and mortality of juvenile winter flounder in two New England estuaries |
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| Authors: | Carol Meise Jeremy S Collie J Widman P Howell |
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| Institution: | (1) Department of Biological Sciences, University of New Hampshire, Spaulding Hall, 38 Academic Way, Durham, NH 03824, USA;(2) Present address: University of New England, Marine Science Center, Biddeford, ME 04005, USA |
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| Abstract: | A length-based model for calculating growth and mortality of juvenile winter flounder (Pseudopleuronectes americanus) populations has been developed. This model is based on work by Sullivan et al. (1990) and incorporates the von Bertalanffy growth equation, including stochasticity in growth, and a mortality rate that decreases exponentially with size. The length-based model was fit to observed size-frequency distributions, and model likelihood profiles were generated to produce 95% confidence intervals about parameter estimates. We analyzed size-frequency distributions of 3 to 15 cm juvenile winter flounder, collected with a 1-m beam trawl, at monthly intervals from June to October during 1993 and 1994. Growth rates were higher at a contaminated site, New Haven Harbor, than at a clean site, the Connecticut River estuary, however, the parameter estimates had overlapping 95% confidence intervals. Mortality rates were similar at the two sites. |
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