Sustainability and Management of Southwest Atlantic Squid Fisheries
Abstract:The southwest Atlantic is home to two important squid fisheries that target species with different life history strategies. Illex argentinus Castellanos, 1960 is an oceanic squid which has a high fecundity and makes long-distance migrations within the Brazil/Falklands western boundary current system. Loligo gahi d'Orbigny, 1835 is a neritic species around the Falkland Islands, which has low fecundity and makes relatively short ontogenetic migrations. However, both have single-year life histories, and populations consisting of multiple cohorts of similarly-aged animals. Fisheries target feeding concentrations of pre-adults and adults. Stock-recruitment relationships for these species are relatively uninformative, although there is evidence that very low stock densities negatively affect recruitment. The stocks are managed using a combination of pre-recruit surveys and in-season depletion-based assessments to meet a target escapement (spawning stock) biomass. Strong links between recruitment and oceanographic parameters have been demonstrated for both species. Sustainability of these, and other, squid stocks is likely to depend on the ability of management to respond to changing environmental conditions, both between years (responding to variable recruitment through in-season management of the single-age cohorts) and over longer periods of time to cope with oceanographic regime shifts.
Document Type: Research Article
Publication date: April 1, 2005
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