Revista de Investigación y Desarrollo Pesquero 2004 Nro 16


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    Características ambientales, reproducción y alimentación de la merluza (Merluccius hubbsi)y la anchoíta (Engraulis anchoita) en su hábitat reproductivo patagónico. Síntesis y perspectivas
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2004) Sabatini, M.
    Fish recruitment seems to be influenced by environmental variability; the plankton would act as a link between both processes. While environmental variability can be explained in terms of physical forcing, recruitment variability is partly determined by the survival of early larvae. In this review, the available information on hydrography and plankton in relation to reproduction and feeding of hake (Merluccius hubbsi) and anchovy (Engraulis anchoita)in the Patagonian Argentine Sea, SW Atlantic spawning ground was summarized and integrated. The objective was to assess what is actually known about the environmental and planktonic features of the region that may have an effect on the recruitment of both species. In the Patagonian spawning ground, detection, in summer, of two major frontal systems of different nature, with a high planktonic production that would coincide with the spawning and nursery areas of hake and anchovy must be mentioned. Hence, it is suggested to test for the local species some well-known hypotheses about the possible physically-mediated mechanisms that may have an impact on the growth and survival of larvae and juveniles
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    Diet of red squid (Ommastrephes bartramii) in the Southwest Atlantic
    (2004) Ivanovic, M.L.; Brunetti, N.E.
    The diet of red squid (Ommastrephes bartramii) during autumn 2001 and 2002 in the SW Atlantic region off Argentina and Uruguay (33° S-42° S;46° W-55° W) was composed mainly of fish (55-68%), followed by squid (32-37%) and zooplankton (8% only in 2001). Around 60% of the fish eaten was identified as myctophids and corresponded to five genera and seven species, with higher frequency of Hygophum hygomii (24-34%). The identification of squids consumed reached 20% in 2001 and 80% in 2002 and the only species identified was O. bartramii, which implies percentages of cannibalism of 5.6% and 25.8% each year. For the range analyzed, 141-443 mm of mantle length (ML), the consumption of fish and squid did not show any relation to the size of predator. In 2001 the presence of zooplankton wasrestricted to individuals smaller than 300 mm ML. The diversity of diet was low and stomachs with a single type of prey predominated both years 59% in 2001, 92% in 2002