IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The Diet of the Argentine Hake Merluccius hubbsi in Patagonian Waters
Autor/es:
BELLEGGIA MAURO; FIGUEROA DANIEL E.; IRUSTA GABRIELA; BURGESS GEORGE; BREMEC CLAUDIA
Lugar:
Chattanooga, Tennessee
Reunión:
Congreso; Joint Meeting of Ichthyologists and Herpetologists; 2014
Institución organizadora:
American Society of Ichthyologist and Herpertologists
Resumen:
In this work the trophic ecology of the Argentine hake Merluccius hubbsi was investigated in the southwest Atlantic Ocean. The specimens were collected in six research cruises carried out during winter 2011, 2012 and 2013, and during summer 2012, 2013 and 2014. The study area covered a great portion of the Patagonian continental shelf between 41° to 47° S, 56 to 67° W, and from 36 to 210 m depth. The stomachs were excised and prey items were identified aboard. The frequency of occurrence of each prey, the total length of fish, mantle length of cephalopods and carapace length of lobster krill were recorded. In total, 46,588 specimens ranging from 9 to 90 cm total length were examined, from which 19,622 (42.12%) contained prey items. The Argentine hake M. hubbsi fed mainly on zooplankton crustaceans (73.82%) such as the euphausiid Euphausia lucens, the hyperiid amphipod Themisto gaudichaudii, and the lobster krill Munida spp., followed by fishes (14.78%) and cephalopods (13.34%). The gadoid M. hubbsi (by cannibalism), the argentine anchovy Engraulis anchoita and the notothenioid Patagonotothen ramsayi were the most consumed fishes. The cephalopods were represented mainly by the Argentine squid Illex argentinus. Dietary shifts related to sex, maturity stage, size, season, region and hour of the day were examined using generalize linear models (GLMs). Prey size - predator size relationships, with emphasis in cannibalism, were analyzed.