Browsing by Author "Ruarte, C.O."
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- ItemAnálisis de la utilización de la captura por unidad de esfuerzo de pescadilla de red (Cynoscion guatucupa) como índice de abundancia anual. Período 1992-2004(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Perrotta, R.G.; Ruarte, C.O.The stripped weakfish (Cynoscion guatucupa) caught in Brazil, Uruguay and Argentina (SW Atlantic) has a wide latitudinal distribution (22° S-43° S). In Argentina there are two main fishing areas, the Argentine-Uruguayan Common Fishing Zone and 'El Rincón', southern zone of the Buenos Aires littoral. The importance of the species makes it necessary to define an annual abundance index that would allow to diagnose the state of the stock. The model adjusted to calculate the index is the General Linear Model. The factors used were Year, Quarter, Length, Stratum (4 categories) and sub-areas (5 categories), all statistically significant. The problem generated by the presence in the model of first order interactions that include the Year factor is discussed. The importance of said interactions is assessed pursuant to the percentage of variance explained considering the model with and without such interactions. It is concluded that the catch per unit of effort series reflects space-temporal changes in the fleet activity not proportional to the biomass.
- ItemEstimación de un índice de abundancia anual estandarizado para pescadilla de red (Cynoscion guatucupa), mediante la aplicación de un modelo lineal general; período 1992-2003(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2007) Ruarte, C.O.; Perrotta, R.G.The stripped weakfish (Cynoscion guatucupa) has a wide latitudinal distribution (22° S-43° S) and it is object of fishery in Brazil, Uruguay and Argentina (SW Atlantic). In this last country, it is mainly captured in the coastal region of Buenos Aires Province by means of a fleet, which has between 20 m and 30 m length. In Argentina, the average landings in the last 5 years were 9,900 t. It is the second commercial species among the coastal groups. There are two main fishery areas of this species: the Argentinean-Uruguayan Common Fishing Zone (AUCFZ) and the El Rincón area, in the South of bonaerense littoral. Due to the importance of this species, it is necessary to define an index of annual abundance to allow a suitable diagnosis of the fishery condition. The General Linear Model is a suitable model to calculate this index. The factors used in this work were: year, trimester, 4 length categories and 5 sub areas. All of them were significant and reflect spatial-temporal changes in the abundance of this species. The model explained 34% of the total variability in the AUCFZ and 46% in the El Rincón. In general, the trends of catch per unit effort (CPUE) were similar and increasing in both areas, registering a greater increase in the internal areas. On the other hand, the fleet displacements between the areas and the reduction of the total fishery area caused a rise in the annual CPUE and a fall of the captures. These captures were dominated by adults but with an important presence of juveniles in the coastal zone off Mar del Plata city.
- ItemEstudio preliminar sobre la estructura de edades y el crecimiento de la pescadilla de red (Cynoscion guatucupa, Pisces, Sciaenidae) en el área sur de la provincia de Buenos Aires(Mar del Plata : Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2008) Ruarte, C.O.; Sáez, M.B.Otoliths reading of specimens derived from research cruises carried out in the south of the Province of Buenos Aires (39°S-41°S), Argentine Sea, in 1998 and 1999 allowed to determine stripped weakfish (Cynoscion guatucupa, Pisces, Sciaenidae) age and growth.
- ItemInventario íctico del litoral costero bonaerense y uruguayo(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Ruarte, C.O.; Rico, M.R.; Lucifora, L.The bibliography and the registries of fish caught in the Buenos Aires (Argentina) and Uruguay coastal littoral area during 33 research cruises were analyzed to elaborate the first ichthyic inventory of the region. A total of 147 species belonging to 71 families was registered. The figure represents 48% of the specimens reported for the Argentine-Uruguayan Common Fishing Zone and 37% of the marine species mentioned for the SW Atlantic. The list of coastal marine fishes of Uruguay and north of Argentina is the first attempt to provide basic information to evaluate possible temporal changes of the ichthyic composition in the area. The lists or inventories constitute an essential tool for fisheries management, the generation of statistic data and gathering of information useful for resource assessment.