INIDEP Documento Científico

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Browsing INIDEP Documento Científico by Subject "Biomass"

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    Acoustic surveys on the southern blue whiting (Micromesistius australis).
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 1999) Madirolas, A.
    Two joint Argentine-British acoustic surveys specifically targeted on the southern blue whiting (Micromesistius australis) were carried out during September 1994 and 1995. The surveys confirmed the existence of a spawning concentration area located south from San Carlos Strait, in waters south of Malvinas Islands, ASW. The obtained point estimates of blue whiting abundance were 84801 t for the 1994 survey and 140953 t for the 1995 survey. The surveys also provided information on the school structure and behavior as well as some clues about the complex migration pattern of the species.
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    Ecología trófica de la merluza común (Merluccius hubbsi) del Mar Argentino : Parte 3 Consumo anual de alimento a nivel poblacional y su relación con la explotación de las pesquerías multiespecíficas.
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 1993) Prenski, L.B.; Angelescu, Víctor; Prenski, Leszek Bruno; Angelescu, Víctor
    The English contents gives a general view on the topics treated in this contribution developed mainly on the basis of a quantitative and ecological analysis of trophic relationships in the Argentinian Continental Shelf, in which common hake and its food species are involved (anchovy, mictophids, small fishes, squids and macrozooplankton crustaceans). The most original part consist in the application of bioenergetic and simulation models for estimating the annual food consumption by individuals and by stocks of common hake during 1970-1987, considering at the same time, the effects of commercial catches on the stockbiomasses in predator-prey relationships. From this point of view three trophic-fishery relationships are evident, namely: 'Common hake-Anchovy'; 'Common hake-squids' and 'Common hake-Common '. The first one refers to a potential fishery, since the anchovy stocks are not yet intensively exploited; in the second relationship, the stocks of both integrant species makes the object of the main argentinian marine commercial fisheries; and the third corresponds to cannibalism. Consequently, the importance of the "tropic catch", that is to say, the food biomass consumed by the common hake stocks (corresponding to a part of the natural mortality M) and the necessity to consider this catch together with the commercial catch to attain a complete management strategy for the multispecies fisheries in the region of the Argentinian Continental Shelf.
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    Sobre la dinámica poblacional de la caballa en la pesquería de Mar del Plata. Período 1980-1990
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 1993) Perrotta, R.G.; Pertierra, J.P.
    This species is a principal basic product of the local canned industry. The results show that the biomass and capture were variable for the studied period as a consequence of change in the capturability, and the fishstock is underexploited. Also was estimated the contribution of recruitment, growth and mortality in the total biomass.
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    Zooplankton biomass in the reproductive area of the southern blue whiting (Micromesistius australis).
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 1999) Sabatini, M.; Álvarez Colombo, Gustavo; Ramirez, F.C.
    Total and size-fractioned zooplankton biomass (larger and smaller than 5 mm) were analyzed over two cruises conducted in the late austral winter (September 1994 and 1995) in the area surrounding Malvinas Islands at the time that massive spawning of southern blue whiting was expected to take place. Biomass was rather uniformly distributed in the area and dominated by the fraction larger than 5 mm in which euphausiids and secondarily chaetognaths were dominating in terms of both weight and number. The smaller fraction was mostly made up of copepods. From the high occurrence of euphausiids and seasonal abundance of the several species of copepods normally present within the area it was hypothesised that the feeding requirements of juvenile and adult blue whiting as well as those of larvae and postlarvae may be met during the winter spawning season. The data were also examined in conjunction with the general pattern of zooplankton biomass occurring in autumn and spring in the Southern Patagonian shelf.