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Título : Variaciones estacionales en el crecimiento de larvas de anchoita (Engraulis anchoita).
Otros títulos : Seasonal variations in growth of anchovy larvae (Engraulis anchoita).
Autor : Leonarduzzi, E.
Theses advisor: Sánchez, R.P.
ASFA Terms: Fish larvae
Growth
Otoliths
Seasonal variations
Daily variation
Fecha de publicación : 2002
Resumen : Age and growth rates of southern anchovy larvae (Engraulis anchoita)were estimated by analysis of daily increments in sagittal otoliths under light microscopy. Samples were collected during 2002 with a bongo net, in the Buenos Aires province, Argentine Sea (SW Atlantic). Otoliths corresponding to 251 larvae (size range 3.5 u 12.2 mm SL)were analyzed. Growth rate estimated as slopes by linear regression of length-age data were 0.50, 0.40, and 0.42 mm/day, and these values corresponded to larvae collected in spring, summer and autumn. Larval growth were significantly distinct between the year seasons (ANCOVA, p<0.01). Recent larval growth expressed as mean growth rates during the last 4 days of the larvae was not correlated with surface temperature. The variation in growth between the three seasons seems to be related to fluctuation in chlorophyll-a concentration and the cycle of primary and secondary production typical of temperate seas.
URI : http://hdl.handle.net/1834/1484
Aparece en las colecciones: Tesis En Ciencias Marinas

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