Temporal variation in Engraulis anchoita eggs and larvae abundance in the Northpatagonian littoral between January-April 2001. Larval growth and mortality
Keywords:Engraulis anchoita, larvae, growth, otoliths, mortality
Argentine anchovy eggs and larvae abundance distribution patterns in the Argentine northpatagonian littoral during January-April 2001 were analyzed. As the season progressed, a process of decline in the reproductive activity was observed. Larval growth and mortality rates were established. Age determinations were performed analyzing otoliths daily increments. The 0.43 mm day-1 growth rate average did not show space-time differences, fact attributed to the homogeneity of the thermal field. The 0.32 d-1 January natural mortality rate was determined by exponential decline. Mortality rates, estimated with the mortality-aggregation model, were considered dependent on the larval size. The value ranges (d-1) were 0.07-0.49, 0.05-0.61 and 0.07-0.51 for January, February, and March-April, respectively.
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Copyright (c) 2013 Daniel Brown, Ezequiel Leonarduzzi, Andrés Averbuj, Juan Livore
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