La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000
Between 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.
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Format: | Journal Contribution biblioteca |
Language: | Spanish / Castilian |
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Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
2003
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Subjects: | Fishery oceanography, Biomass, Environmental conditions, Population characteristics, Echo surveys, Mackerel fisheries, |
Online Access: | http://hdl.handle.net/1834/2418 |
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dig-aquadocs-1834-24182021-05-19T06:23:00Z La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 Chub mackerel (Scomber japonicus) distribution in El Rincon area (39°40'-41°'30'S) of the Argentine Sea in relation to environmental conditions. September 2000 Perrotta, R.G. Viñas, M.D. Madirolas, A. Reta, R. Akselman, R. Castro Machado, F. Garciarena, A.D. Macchi, G.J. Moriondo Danovaro, P. Llanos, V. Urteaga, J.R. Fishery oceanography Biomass Environmental conditions Population characteristics Echo surveys Mackerel fisheries Fishery oceanography Biomass Environmental conditions Between 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. Publisher permission Published Scombridae, Scomber japonicus, caballa 2008-05-31T13:23:41Z 2008-05-31T13:23:41Z 2003 Journal Contribution INIDEP informe técnico, 54. p. 1-25 0327-9642 http://hdl.handle.net/1834/2418 es Argentina, Buenos Aires Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero |
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Fishery oceanography Biomass Environmental conditions Population characteristics Echo surveys Mackerel fisheries Fishery oceanography Biomass Environmental conditions Fishery oceanography Biomass Environmental conditions Population characteristics Echo surveys Mackerel fisheries Fishery oceanography Biomass Environmental conditions |
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Fishery oceanography Biomass Environmental conditions Population characteristics Echo surveys Mackerel fisheries Fishery oceanography Biomass Environmental conditions Fishery oceanography Biomass Environmental conditions Population characteristics Echo surveys Mackerel fisheries Fishery oceanography Biomass Environmental conditions Perrotta, R.G. Viñas, M.D. Madirolas, A. Reta, R. Akselman, R. Castro Machado, F. Garciarena, A.D. Macchi, G.J. Moriondo Danovaro, P. Llanos, V. Urteaga, J.R. La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 |
description |
Between 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. |
format |
Journal Contribution |
topic_facet |
Fishery oceanography Biomass Environmental conditions Population characteristics Echo surveys Mackerel fisheries Fishery oceanography Biomass Environmental conditions |
author |
Perrotta, R.G. Viñas, M.D. Madirolas, A. Reta, R. Akselman, R. Castro Machado, F. Garciarena, A.D. Macchi, G.J. Moriondo Danovaro, P. Llanos, V. Urteaga, J.R. |
author_facet |
Perrotta, R.G. Viñas, M.D. Madirolas, A. Reta, R. Akselman, R. Castro Machado, F. Garciarena, A.D. Macchi, G.J. Moriondo Danovaro, P. Llanos, V. Urteaga, J.R. |
author_sort |
Perrotta, R.G. |
title |
La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 |
title_short |
La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 |
title_full |
La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 |
title_fullStr |
La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 |
title_full_unstemmed |
La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 |
title_sort |
la caballa (scomber japonicus) y las condiciones del ambiente en elárea "el rincón" 39°40'-41°30's del mar argentino. septiembre 2000 |
publisher |
Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero |
publishDate |
2003 |
url |
http://hdl.handle.net/1834/2418 |
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1756075384455036928 |