SciELO - Scientific Electronic Library Online

 
vol.37 número2Composición elemental y contenido de metales en sedimentos marinos de la bahía Mejillones del Sur, Chile: evaluación ambiental de la zona costera índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Latin american journal of aquatic research

versión On-line ISSN 0718-560X

Resumen

CUBILLOS, Luis A; RIQUELME, Katty  y  ERNST, Billy. Latitudinal changes in the Patagonian grenadier (Macruronus magellanicus) pelagic fishery off central-southern Chile (1986-2003). Lat. Am. J. Aquat. Res. [online]. 2009, vol.37, n.2, pp. 121-129. ISSN 0718-560X.

We analyzed spatio-temporal changes in Patagonian grenadier catches by the purse-seine fleet off central-southern Chile (34°-41°30'S) in order to check the hypothesis that the juvenile fraction of the population migrates northward in spring. Log-book data from 1986 to 2003 were used to calculate the center of gravity of and variance of each catch. We proposed that, if the fleet follows the migratory behavior of the juvenile fraction, the centers of gravity of the catches will migrate from south to north as the fishing season progresses. Nevertheless, the centers of gravity migrated northward in only four cases. Unexpectedly, the centers of gravity remained stationary within each fishing season. Now we propose that, in spring, a resident juvenile fraction of Patagonian grenadier increases its accessibility and vulnerability in the surface waters due to the environmental conditions, characterized by the dominance of upwelling events, and rather than a northward migration.

Palabras llave : spatial dynamics; centers of gravity; purse-seine fleet; Patagonian grenadier; central-southern Chile.

        · resumen en Español     · texto en Español     · pdf en Español