La caballa (Scomber japonicus) y las condiciones del ambiente en el área "El Rincón" (39°40'-41°30' S) del Mar Argentino. Septiembre, 2000

dc.bibliographicCitation.titleINIDEP informe técnicoes
dc.contributor.authorPerrotta, R.G.
dc.contributor.authorViñas, M.D.
dc.contributor.authorMadirolas, A.
dc.contributor.authorReta, R.
dc.contributor.authorAkselman, Rut
dc.contributor.authorCastro Machado, F.
dc.contributor.authorGarciarena, A.D.
dc.contributor.authorMacchi, G.J.
dc.contributor.authorMoriondo Danovaro, P.
dc.contributor.authorLlanos, V.
dc.contributor.authorUrteaga, J.R.
dc.coverage.spatialArgentina, Buenos Aires
dc.description.abstractBetween September 1st and 6th a research cruise was carried out in the Buenos Aires shelf area of "El Rincon" 39°40'-41°30'S, Argentine Sea SW Atlantic. The total area studied was 2,527.8 nautical mile2. Knowledge of the commercial fleet location at the time of the survey allowed to intensify sampling in a 'miniarea' of 52,8 nautical mile2. The acoustic assessment of chub mackerel (Scomber japonicus) biomass was 49,511.9 t, 94 of which corresponded to this last area. Fish samples coming from fishing trawls included only adult individuals of 240-460 mm total length (TL) and ages ranging 2-11 years. The limit age was estimated at 13 years and natural and total mortality rates at 0.23 and 0.54, respectively. Oceanographic conditions were those typical of the winter season, characterized by the vertical homogeneity of the water column in temperature and salinity. The isotherms and isohalines distributed parallel to the 50 m isobath with values progressively decreasing from the coast towards the slope. Salinity values allowed to detect two hydrographic regimes: that of the San Matias Gulf 33.8-34.4 located to the West and covering more than half of the study area and the one of the Shelf Waters 33.5-33.79 occurring towards the East. A positive gradient in chlorophyll a concentration was observed in N-S sense and from the coast towards the shelf break. The highest densities of phytoplankton, with dominance of diatoms, were observed in the southern sector. Low concentrations of Alexandrium tamarense and Prorocentrum minimum, two potentially noxious dinoflagellates, were detected. The highest zooplankton biomass associated to the highest salinity values and salinity gradients, represented mostly by Calanoides cf. carinatus, was also detected in the southern sector. The western sector, influenced by the San Matias Gulf regime and characterized by high densities of both, phytoplankton and zooplankton, may constitute a potentially favourable feeding ground for chub mackerel.en
dc.description.otherScombridae, Scomber japonicus, caballa
dc.identifier.citationINIDEP informe técnico, 54. p. 1-25
dc.publisherMar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
dc.rightsPublisher permission
dc.subject.agrovocFishery oceanographyen
dc.subject.agrovocEnvironmental conditionsen
dc.subject.asfaPopulation characteristicsen
dc.subject.asfaEcho surveysen
dc.subject.asfaMackerel fisheriesen
dc.subject.asfaFishery oceanographyen
dc.subject.asfaEnvironmental conditionsen
dc.titleLa caballa (Scomber japonicus) y las condiciones del ambiente en el área "El Rincón" (39°40'-41°30' S) del Mar Argentino. Septiembre, 2000es
dc.title.alternativeChub mackerel (Scomber japonicus) distribution in El Rincon area (39°40'-41°'30'S) of the Argentine Sea in relation to environmental conditions. September 2000en
dc.typeJournal Contribution
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