Remotely sensed mesoscale oceanography and the distribution of Illex argentinus in the South Atlantic

first_imgIn this study, we consider the influence of mesoscaleoceanographic processes around the Falkland Islands(Islas Malvinas) in the South-west Atlantic, duringthe period in which the commercial squid fishery forIllex argentinus operates. Spatially referenced fisherydata and satellite-derived advanced very high resolutionradiometry (AVHRR) sea surface temperature(SST) data were examined using geographic informationsystem (GIS) techniques. The distribution andrelative abundance of I. argentinus in the FalklandIslands fishery was examined for the period 1989±96.Three consistent areas of high abundance wereobserved to the north-east (shelf-break region) andnorth-west (shelf region) of the islands, and close tothe northern coast of East Falkland. Areas of high seasurface temperature gradients (thermal gradients)extracted from remotely sensed satellite images wereused as an indicator of mesoscale oceanographicactivity and compared with the location of the fishery.I. argentinus were found to be associated with areas ofthermal gradients, commonly seen at the interface ofFalkland Current and Patagonian shelf waters. Thetechniques used in this analysis allow the overlay andanalysis of physical oceanographic and fishery datawith potential applications in fisheries managementand operational fisheries oceanography.last_img

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