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  • 1
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    Una aplicación de los estudios ambientales para orientar la pesqueria de la caballa Scomber japonicus en Mar del Plata (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: Both mackerel mean biomass and mean fishing effort in Buenos Aires (Argentina) shelf during the period 1990-91/1994-95 were estimated. Those values were 85,792 t and 42,051 minutes, respectively. However, the best economic profit from the fishery (about $15,390,036)($1=U$S1) was estimated to take place at 28,000 minutes. It was observed a waste in fishing effort of the commercial fleet related with sea surface temperatures of 19°C or more. Moreover, adult mackerel find better trophic conditions on the continental shelf (depth 50m), while larvae originated from massive spawning in late November-early December, i.e., during the main fishing season, find their optimum at lower depths. Mackerel shoals enter and leave fishing grounds in a counterclockwise way pushed by waters from the median shelf. A fishing strategy according with sea surface temperature is proposed to lead the commercial fleet.
    Description: Publisher permission
    Description: Published
    Description: Scombridae, Scomber japonicus, caballa
    Keywords: Biomass ; Environmental conditions ; Mackerel fisheries ; Biomass ; Catch/effort ; Environmental conditions ; Economic models ; Commercial fishing
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 2
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    Aspectos poblacionales de Themisto gaudichaudii, una especie clave en la trama trófica de la plataforma patagónica austral (2016)
    Details
    Publication Date: 2021-05-19
    Description: With the aim of studying population aspects of Themisto gaudichaudii, samples from 12 research cruises carried out in different seasons were analyzed. Abundances and biomass were among the highest recorded for the species throughout its distribution range. These parameters showed a strong seasonal variation with the highest values recorded during spring-summer (maximum at the end of the period: 16.6 ind. m-3 and 20 mg m-3), and minimum values in winter (0.9 ind. m-3 and 1.7 mg m-3). The highest concentrations were located between 50° S and 52° S in the Bahía Grande. These biomasses would be developed by adaptations to local environmental conditions, particularly to high food availability and temperature. The population of T. gaudichaudii analyzed presents a more extended reproductive period (spring-summer), a larger number of cohorts (two main cohorts) and a smaller size at maturity (~ 10 mm) than other populations at similar latitudes. These adaptations would favor a larger population of T. gaudichaudii placing the ecosystem of the southern Patagonian shelf among the most favorable for the development of the species throughout its global distribution range.
    Description: Con el objeto de estudiar aspectos poblacionales de Themisto gaudichaudii en la plataforma patagónica austral, se analizó material de 12 campañas de investigación realizadas en las distintas estaciones del año. Las abundancias y biomasas obtenidas estuvieron entre las más altas registradas para la especie en toda su área de distribución. Ambas mostraron una fuerte variación estacional con elevados valores en primavera-verano y un máximo al final del período (16,6 ind. m-3 y 20 mg m-3), y mínimos valores en invierno (0,9 ind. m-3 y 1,7 mg m-3). Las mayores concentraciones se encontraron entre 50° S y 52° S en la zona de Bahía Grande. Estas elevadas biomasas serían desarrolladas mediante adaptaciones a las condiciones ambientales locales, particularmente la alta disponibilidad de alimento y la temperatura. La población de T. gaudichaudii analizada presenta un período reproductivo más extendido (primavera-verano), un mayor número de cohortes (dos cohortes principales) y una menor talla de primera madurez (~ 10 mm) que otras poblaciones de latitudes similares. Estas adaptaciones favorecerían una población más numerosa de T. gaudichaudii colocando al ecosistema de la plataforma patagónica austral entre los más favorables para el desarrollo de la especie en todo su rango de distribución global.
    Description: Published
    Keywords: Zooplancton ; Dinámica poblacional ; Historia de vida ; Estructura poblacional ; Amphipoda ; Themisto gaudichaudii ; ASFA15::Y::Zooplankton ; ASFA15::P::Population dynamics ; ASFA15::L::Life history ; ASFA15::P::Population structure
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 69-88
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  • 3
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    La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    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.
    Description: Publisher permission
    Description: Published
    Description: Scombridae, Scomber japonicus, caballa
    Keywords: Fishery oceanography ; Biomass ; Environmental conditions ; Population characteristics ; Echo surveys ; Mackerel fisheries ; Fishery oceanography ; Biomass ; Environmental conditions
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 4
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    Anfípodos hiperideos. (2018)
    Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) | Mar del Plata, Argentina
    Details
    Publication Date: 2021-05-19
    Description: En el presente capítulo se presenta una recopilación de las investigaciones sobre anfípodos hiperideos realizadas en el Mar Argentino y adyacencias que abarcan aspectos relacionados con los patrones de distribución y abundancia de las especies que lo habitan y el rol que desempeñan en las tramas tróficas pesqueras. Themisto gaudichaudii, la especie dominante, con una amplia distribución en todo el Mar Argentino, registra el mayor nivel de biomasa en la plataforma patagónica austral. El anfípodo es un importante componente de la dieta del calamar (Illex argentinus) y de peces australes de alto valor comercial tales como la merluza de cola (Macruronus magellanicus), la merluza común (Merluccius hubbsi), la nototenia (Patagonotothen ramsayi), la polaca (Micromesistius australis) y el savorín (Seriolella porosa) que representan el 85 por ciento de la biomasa íctica de la plataforma patagónica austral.
    Description: In this chapter, a compilation of the research on hyperiid amphipods carried out in the Argentine Sea and adjacencies that comprises aspects related to the distribution and abundance patterns of the inhabitant species and the role they play in the fishery food webs is presented. Themisto gaudichaudii, the dominant species, with a wide distribution throughout the Argentine Sea, registers the highest biomass level in the southern patagonian shelf. The amphipod is an important item in argentine squid (Illex argentinus) diet and in that of austral fishes of high commercial value such as longtail hake (Macruronus magellanicus), Argentine hake (Merluccius hubbsi), longtail southern cod (Patagonotothen ramsayi), southern blue whiting (Micromesistius australis) and choisy ruff (Seriolella porosa) that represent 85 percent of the southern patagonian shelf ichthyic biomass.
    Description: Contribución INIDEP 1965
    Description: Published
    Keywords: Morfología animal ; Distribución ; Distribución geográfica ; Distribución vertical ; Alimentación ; Trama alimenticia ; Interacciones ; Themisto gaudichaudii ; ASFA_2015::A::Animal morphology ; ASFA_2015::D::Distribution ; ASFA_2015::G::Geographical distribution ; ASFA_2015::V::Vertical distribution ; ASFA_2015::F::Feeding behaviour ; ASFA_2015::F::Food webs ; ASFA_2015::I::Interactions
    Repository Name: AquaDocs
    Type: Book Section , Refereed
    Format: pp.29-39
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  • 5
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    Biomasa y composición del zooplancton de interés trófico pesquero en áreas del Atlántico Sudoccidental. Campaña H-09/92, 45°30' - 52°00'S, noviembre 1992. (2015)
    Details
    Publication Date: 2021-09-18
    Description: This paper studies the mesozooplankton and macrozooplankton biomasses shelf distributions and their composition, during a spring survey. Samples were obtained by a Nackthai sampler. Wet weight biomasses were determined by direct weighing for each fraction. Mesozooplankton biomass ranged between 16 and 3600 mg. m-3, and the highest values (200 mg.m-3) were recorded between 47° and 50°S, at intermediate shelf. As a trend, biomass increased from coastal to offshore. A similar pattern was observed for the abundance, dominated by copepods (Drepanopus forcipatus and Calanus sp.) Macrozooplankton biomass ranged between 5 and 116 mg.m-3. The highest values were also recorded at intermediate shelf (50 mg.m-3) between 48° and 50°30'S. Abundance distribution showed a similar pattern, and eufausid (Euphausia spp.) and amphipods (Themisto gaudichaudii) alternated their dominance.
    Description: Published
    Keywords: Zooplancton ; Biomasa ; Themisto gaudichaudii ; Drepanopus forcipatus ; Calanus sp. ; ASFA15::Y::Zooplankton ; ASFA15::B::Biomass
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.23-33
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