ESTIMATING GROWTH RATE OF EUPHAUSIIDS IN THE EASTERN BERING SEA USING INDIVIDUAL-BASED MODELS
Samples of Thysanoessa raschii, a coastal species, and T. inermis, a deeper water species, were collected in April to July in 2008 and 2009. The length frequency of T. raschii suggested one cohort, in April and July 2008, and two cohorts, whereas T. inermis had a single cohort in April and July 2008 and 2009. To estimate growth rates, two different techniques were applied and compared: a length frequency based technique and an inverse parameter estimation technique using individual based models. Simulated results suggested that the inverse approach based on individual based models performed better than the length-frequency method. The growth rates for two species were different between 2008 and 2009: T. inemis had higher growth rate in 2008, 0.062 mm/day, than 2009, 0.038 mm/day, while T. raschii had similar growth rate in 2008, 0.054 mm/day, and 2009, 0.054 mm/day. The difference in growth could be explained by the inclusion of age structure information determined from biochemical approach: more young individuals, faster growth rate for the population; higher survival rate for old individuals, slower growth rate for the population.
Bi, H., University of Maryland Center for Environmental Science, USA, firstname.lastname@example.org
Yu, H., University of Maryland Center for Environmental Science, USA, email@example.com
Pinchuk, A., University of Alaska, USA, firstname.lastname@example.org
Harvey, R., Old Dominion University, USA, email@example.com
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