Potential Impact of a Seasonal Migratory Jumbo Squid (Dosidicus Gigas) Stock on a Gulf of California Sardine (Sardinops Sagax Caerulea) Population
Abstract:The jumbo squid inhabits the central eastern Pacific. Annually, the species migrates with different intensities in and out of the Gulf of California. In 1980 an unusually large squid stock was observed in the Gulf. Extensive research on that migratory stock resulted in new insights about the biology and population dynamics of the jumbo squid. Further analyses are presented in this paper which indicate that sardines were a significant component in the jumbo squid diet. A quantitative assessment of the potential sardine biomass consumption by jumbo squid was carried out by integrating biological components. The results indicate that up to 60,000 metric tons (mt) of sardines may have been consumed by jumbo squids during their 9-month residence in the Gulf of California. Drop in total sardine landings during the 1981 fishing season may be attributed at least in part to an unusually high sardine mortality which may have been induced by squid predation.
Document Type: Research Article
Publication date: September 1, 1991
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