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dc.contributor.authorPerrotta, R.G.
dc.contributor.authorMadirolas, A.
dc.contributor.authorViñas, M.D.
dc.contributor.authorAkselman, R.
dc.contributor.authorGuerrero, R.A.
dc.contributor.authorSánchez, M.F.
dc.contributor.authorLópez, F.
dc.contributor.authorCastro Machado, F.
dc.contributor.authorMacchi, G.J.
dc.coverage.spatialAtlántico Sudoccidental, Argentina, Buenos Aires, El Rincón
dc.date.accessioned2008-07-12T12:29:21Z
dc.date.available2008-07-12T12:29:21Z
dc.date.issued1999
dc.identifier.citationINIDEP informe técnico, 26. p. 1-29
dc.identifier.issn0327-9642
dc.identifier.urihttp://hdl.handle.net/1834/2529
dc.description.abstractIn August 1996 acoustic methods were employed to estimate mackerel (Scomber japonicus) abundance in the Buenos Aires, Argentina shelf area of "El Rincón" (4,287 mn2), located between 39°- 40° 30' S. Results showed a biomass estimate of 77,260 t. ASIMRAD EK-500 equipment operated with a 38 KHz split-beam transducer was used. Midwater fishing trawls were employed to identify echotraces and to collect mackerel samples.Trawls 4 and 5 were the most successful. Samples included only adult fish (310-470 mm Lt and ages ranging 2-11). Length and weight growth parameters and mortality rates were estimated. Analysis of the stomach contents revealed that mackerel was feeding exclusively on zooplankters over 2 mmlength. The analysis of the characteristics (dimensions and density) of the mackerel shoals allowed to detect two areas of concentration above and below 40°S latitude. The northern area was characterized by relatively small schools of medium density similar to those of the Mar del Plata area. In the southern zone, large schools of high density that account for almost 92 of the total biomass were found.Differences between both areas were also detected when plankton distribution was analyzed. Higher abundances of the dinoflagellate Alexandrium tamarense corresponded to the southern area. On the contrary, higher zooplankton biomass was detected northerly of 40°S. From an oceanographic standpoint, the presence of mackerel was associated to relatively higher salinity values. As a result of the different data analyzed it is suggested that,during this time of the year, the species shows a migratory pattern from the intermediate shelf to coastal areas.en
dc.language.isoes
dc.publisherMar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
dc.titleLa caballa (Scomber japonicus) y las condiciones ambientales en el area bonaerense de El Rincón (39°- 40°30' S), agosto 1996.es
dc.title.alternativeMackerel (Scomber japonicus) and the environmental conditions in the Buenos Aires shelf area of "El Rincón" (39°- 40° 30' S)en
dc.typeJournal Contribution
dc.bibliographicCitation.agscitationNumbervol. 26, p.1-29
dc.bibliographicCitation.endpage29
dc.bibliographicCitation.stpage1
dc.bibliographicCitation.titleINIDEP informe técnicoes
dc.bibliographicCitation.volume26
dc.description.notesPublisher permission
dc.description.statusPublisheden
dc.description.otherScombridae, Scomber japonicus, caballa, zooplancton, relevamientos ecoicos, condiciones ambientales, biomasa, abundancia, estructura poblacional
dc.subject.agrovocBiomassen
dc.subject.agrovocPopulation structureen
dc.subject.agrovocZooplanktonen
dc.subject.agrovocEnvironmental conditionsen
dc.subject.asfaAbundanceen
dc.subject.asfaBiomassen
dc.subject.asfaPopulation structureen
dc.subject.asfaZooplanktonen
dc.subject.asfaEnvironmental conditionsen
dc.subject.asfaEcho surveysen
refterms.dateFOA2021-01-30T18:47:50Z


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