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Investigaciones marinas

On-line version ISSN 0717-7178

Abstract

CUBILLOS, Luis A; ALARCON, Carolina  and  ARANCIBIA, Hugo. Size-based prey selectivity in South Pacific hake (Merluccius gayi gayi), central-southern Chile (1992-1997). Investig. mar. [online]. 2007, vol.35, n.1, pp.55-69. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71782007000100005.

Size-based prey selectivity in Chilean hake (Merluccius gayi gayi) is analyzed using a data base of stomach contents collected from 1992 to 1997. The Ursin prey selectivity index and the size-based selectivity coefficients were calculated by age for the Chilean hake (cannibalism); the galatheids squat lobster (Pleuroncodes monodon) and yellow squat lobster (Cervimunida johni); the clupeiforms common sardine (Strangomera bentincki) and anchovy (Engraulis ringens); and other combined prey. Hake are confirmed to consume larger prey as they grow and individuals over two years of age show a preference for the young fraction of the hake population (0-4 years; cannibalism), anchovy (0-1 year), and lobster (0-1 year). Hake over four years of age also prefer squat lobster and yellow squat lobster (> 2 years). High selection coefficients are found for the remaining prey, mostly zooplankton (euphausids) and myctophids, with predators from 0 to 4 years. The selection coefficients calculated herein constitute a quantitative basis for improving multispecific evaluation models that allow the quantification of the trophic impact of Chilean hake on commercially important species of the benthic-demersal and pelagic system off central-southern Chile

Keywords : stomach content; predation; suitability coefficients; size selectivity index; Chilean hake; central-south Chile.

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