VARIACIÓN TEMPORAL DE LA ABUNDANCIA DE HUEVOS Y LARVAS DE Engraulis anchoita EN EL LITORAL NORPATAGÓNICO ENTRE ENERO Y ABRIL DE 2001. CRECIMIENTO Y MORTALIDAD LARVAL

DANIEL R. BROWN; EZEQUIEL LEONARDUZZI; ANDRES AVERBUJ; LIVORE, JP

REVISTA DE INVESTIGACION Y DESARROLLO PESQUERO

INSTITUTO NACIONAL DE INVESTIGACIÓN Y DESARROLLO PESQUERO

Lugar: Mar del Plata; Año: 2013 vol. 23 p. 175 - 192

0325-6375

Temporal variation in Engraulis anchoita eggs and larvae abundance in the northpatagonian littoral between January-April 2001. Larval growth and 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. Agedeterminations 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.