Surface oceanography of the inferred hatching grounds of Illex argentinus (Cephalopoda: Ommastrephidae) and influences on recruitment variability
In this study, we consider the influence of mesoscale
oceanographic processes around the Falkland Islands
(Islas Malvinas) in the South-west Atlantic, during
the period in which the commercial squid fishery for
Illex argentinus operates. Spatially referenced fishery
data and satellite-derived advanced very high resolution
radiometry (AVHRR) sea surface temperature
(SST) data were examined using geographic information
system (GIS) techniques. The distribution and
relative abundance of I. argentinus in the Falkland
Islands fishery was examined for the period 1989-96.
Three consistent areas of high abundance were
observed to the north-east (shelf-break region) and
north-west (shelf region) of the islands, and close to
the northern coast of East Falkland. Areas of high sea
surface temperature gradients (thermal gradients)
extracted from remotely sensed satellite images were
used as an indicator of mesoscale oceanographic
activity and compared with the location of the fishery.
I. argentinus were found to be associated with areas of
thermal gradients, commonly seen at the interface of
Falkland Current and Patagonian shelf waters. The
techniques used in this analysis allow the overlay and
analysis of physical oceanographic and fishery data
with potential applications in fisheries management
and operational fisheries oceanography.
Details
Publication status:
Published
Author(s):
Authors: Waluda, C M, Rodhouse, P G, Podestá, G P, Trathan, P N, Pierce, G J
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