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  • 1
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    Boundary element method to analyze acoustic scattering from a coupled swimbladder-fish body configuration (2020)
    Elsevier
    Details
    Publication Date: 2020-11-01
    Print ISSN: 0022-460X
    Electronic ISSN: 1095-8568
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 2
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    Acoustic study of the Río de la Plata estuarine front (2006)
    Oxford University Press
    Details
    Publication Date: 2006-01-01
    Description: During December 1999, a transect 260 km long was carried out along the major axis of the Río de la Plata estuary. Acoustic (120 kHz), oceanographic, and zooplankton sampling were performed to extract a continuous, quasi-synoptic acoustic view of the estuary's salt wedge. Three different zones were identified. The riverine and marine zones were characterized by vertically homogeneous water and low volume-backscattering strength (Sv). The mixohaline zone was characterized by a strong vertical salinity gradient and the highest Sv values. There were no relationships between the reflection value calculated from the salinity gradient and suspended matter (sediments) and measured Sv. The greatest abundance of acoustically detectable organisms was at the halocline depth, coincident with the echo recordings. The positions of the halocline and the two fronts were determined on the basis of aggregations of the different planktonic groups. The physical presence of the salt wedge, as shown by a “biological wedge”, was well described by the acoustic technique employed.
    Print ISSN: 1054-3139
    Electronic ISSN: 1095-9289
    Topics: Biology , Geosciences , Physics
    Published by Oxford University Press on behalf of International Council for the Exploration of the Sea.
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  • 3
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    Acoustic survey of a jellyfish-dominated ecosystem (Mljet Island, Croatia) (2008)
    Springer
    Details
    Publication Date: 2008-10-15
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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  • 4
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    Ecosistema costero de plataforma bonaerense: arrecifes naturales y pecios. (2019)
    Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) | Mar del Plata, Argentina
    Details
    Publication Date: 2021-05-19
    Description: La plataforma de Buenos Aires (Argentina), al igual que el resto de la plataforma continental argentina, se destaca por su gran extensión, dando lugar a una amplia zona nerítica. Las aguas que bañan su sector costero son templado cálidas pero sus características cambian notablemente a profundidades de 60-80 m (aproximadamente entre 50-75 km de la costa) lo que marca un límite, difícil de establecer con precisión, entre dos provincias biogeográficas ampliamente aceptadas, la primera influenciada tanto por masas de agua de origen subantártico como de origen subtropical y la segunda influenciada por aguas frías tales como la Corriente de Malvinas. Biogeográficamente se trata de un área de transición, donde se encuentran especies tanto de aguas subtropicales como de aguas subantárticas y muestra muy bajo endemismo. En lo que al fondo marino refiere, se corresponde con la planicie pampeana cuyos rasgos se extienden a la zona costera y plataforma. El sustrato, excluyendo las zonas estuarinas del Río de la Plata y Bahía Blanca, se caracteriza por el predominio de arenas finas y medias aunque hacia el sur, frente a la zona de San Blas existen porcentajes considerables de arenas gruesas a muy gruesas. En toda la región son importantes los bioclastos de carbonato aportados principalmente por restos de moluscos. En los sectores costeros, las fuertes corrientes de marea generan fondos con características inestables. Asimismo se destacan ciertos sustratos duros los cuales conforman no solo intermareales rocosos aislados sino además afloramientos sublitorales bien consolidados formados por grandes bloques donde se desarrolla abundante epifauna. Estos fondos duros proveen un número importante de hábitats para distintas asociaciones de peces e invertebrados bentónicos, convirtiéndose de esta manera en zonas de alto interés tanto por su importancia pesquera como para la conservación de la biodiversidad marina. El término correcto para denominar tales fondos es "arrecife", sin embargo en nuestro país es un término poco utilizado y toda referencia a estos sustratos duros submareales es bajo los términos restingas (cuando están localizados a poca profundidad) o bancos, este último hace referencia a elevaciones sobre el fondo marino como bancos de arena, de conchillas o rocosos y a los componentes faunísticos característicos que allí se desarrollan (por ejemplo, bancos de mejillones). Durante los últimos años el esfuerzo pesquero se ha ido incrementando y los recursos costeros han sido fuertemente impactados por los arrastres pesqueros, pueden producir disturbios en las comunidades bentónicas y los hábitats reduciendo la biomasa, producción y biodiversidad. En este contexto, tanto los fondos duros o arrecifes naturales como artificiales juegan un importante rol como refugio, hábitat y aún sustrato para numerosos invertebrados y son además áreas menos propensas de sufrir disturbios por actividades de pesca comercial de arrastre. Razón por la cual algunos bancos sublitorales de la Provincia de Buenos Aires han sido estudiados en distinta profundidad y procurando alcanzar distintos objetivos, buscando conocer las comunidades de aquellos fondos consolidados donde abundan peces de interés comercial, o comparando arrecifes naturales y artificiales a fin de conocer cuan miméticas son las comunidades desarrolladas en los pecios con respecto a los afloramientos rocosos, sean estos navíos sumergidos producto de hundimientos accidentales (naufragios) o programados para emplazar parques submarinos con fines recreativos (por ejemplo buceo autónomo, pesca deportiva).
    Description: Published
    Keywords: Sparidae ; Pagrus pagrus ; Carangidae ; Seriola lalandei ; Seriola lalandi ; Besugo ; Pez limón ; Comunidades bentónicas ; Arrecifes ; Bancos (topografía) ; Bancos submarinos ; Sustrato ; Arrecifes artificiales ; Composición de la comunidad ; Naufragios ; Pecios ; Afloramientos ; Benthic communities ; Reefs ; Banks (topography) ; Submarine banks ; Substrata ; Artificial reefs ; Community composition ; Wrecks ; Flotsam ; Outcrops
    Repository Name: AquaDocs
    Type: Book Section , Refereed
    Format: pp27-37
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  • 5
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    Hydroacoustical evidence of the expansion of pelagic swarms of Munida gregaria (Decapoda, Munididae) in the Beagle Channel and the Argentine Patagonian Shelf, and its relationship with habitat features (2020)
    Details
    Publication Date: 2021-05-19
    Description: Squat lobsters are highly diversified and widespread decapods, of which only three species form pelagic swarms. Here we infer the expansion of Munida gregaria populations in the Beagle Channel and the Argentine Patagonian Shelf by means of acoustic surveys of pelagic swarms. We also describe the habitat characteristics in which these swarms occur. Acoustic data was collected during three multidisciplinary scientific cruises on board of the R/V Puerto Deseado during 2009, 2012 and 2014. Despite differences in the environmental conditions between the two surveyed areas, between 2009 and 2014 pelagic swarms increased their occurrence and abundance both in the Beagle Channel and on the Argentine Patagonian Shelf. Towards the end of the studied period, pelagic swarms of M. gregaria occurred in new locations, supporting the notion of a population expansion. Within the Beagle Channel swarm expansions were more marked than on the Patagonian Shelf. We here postulate that M. gregaria expansions occur in association with productive areas of the Argentine continental shelf, such as frontal zones, favoured by the squat lobster phenotypic plasticity that permit to exploit resources in both the neritic and benthic environments. At a regional scale on the Patagonian Shelf, three main groups of pelagic swarms of M. gregaria were clearly associated to respective frontal zones. The information presented here is necessary to understand fluctuations in both distribution and abundance patterns of a key species on the Argentine continental shelf. These fluctuations could be direct or indirect indicators of changes in the ecosystem.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-12
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  • 6
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    Algunos resultados de las campañas primaverales de evaluación anual de anchoíta bonaerense efectuadas entre 1993 y 1996. (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: Information resulting from four spring acoustic surveys carried out between 1993 - 1996 to assess bonaerensis anchovy (Engraulis anchoita) biomass (34°- 41°30´S) is presented. Annual estimates, successively higher, went from 1.5 to 5.3 millon tons and the respective coefficient of variability that followed the same trend ranged between 7.4. and 28.0. . In general terms, the largest abundances were those recorded within the coastal strata off the Río de la Plata followed by those of the most southern stratum. Nevertheless, during the 1996 survey, the latter showed very high biomass values and, consequently, the largest mean. The region corresponding to the main commercial anchovy fishing ground during the season represented, in any case, relatively low percentages of the total biomass estimates. It is very unusual that anchovy spring distribution off the Buenos Aires Province (Argenmtina) extends to waters deeper than 80 m. Although small to medium size specimens were predominant in the most northern strata and the largest individuals were characteristic of the southern, coastal strata, a high interannual variability was found. The most numerous size classes comprised one year old individuals of 90-145 mm total length whereas biomass showed predominance of two year old and 135-180 mm anchovies. A very strong 1993 year class was found. Similar conditions apply to the 1995 year class (age 1 in 1996). Size-at-50. first maturity (L50. ) by cruise ranged between 92.5 - 101.8 mm total length for one year old specimen. The estimate derived from the pooled data was. L50. = 97.3 mm. The smallest sexually mature individuals were 75 mm long. The length (L, in milimeters) - weight (W, ingrams) relatinonship fitted for the whole period was as follows: W = 1.45 * 10-6 * L3.31. The von Bertalanffy length growth curve fitting by survey gave similar results. The equation corresponding to the available data was: Lt = 194.5 mm * {1 -exp [- 0.483 (t + 0.66)]}. The "catch curve" method used in each survey showed a wider variation in total mortality ratevalues (Z). However, except for the 1995 cruise, they all appeared to be consistent with previous estimations that ranged between 0.95 - 1.08. Fitting of the "mean catch curve" resulted in Z= 1.07. Natural mortality rates calculated with anindirect method (Pauly, 1980) ranged between M= 0.71 - 0. 93 (water temperature = 13°C) and between M= 0.78 - 1. 03(water temperature = 16°C). The interval corresponding to the pooled data was 0.88 ? M ? 0.97. There is not enough evidence to determine if the increase in anchovy biomass observed during those four years, due to strong year classes, can be attributed to favorable environmental conditions or if it is the consequence of the decrease in biomass of common hake and croaker, the two main anchovy predators. The fact that part of the anchovy stock might not have been in the area at the time of the surveys must also be taken into account.
    Description: Publisher permission
    Description: Published
    Description: Engraulidae, Engraulis anchoita,madurez sexual, relevamientos ecoicos, crecimiento, biomasa, mortalidad
    Keywords: Biomass ; Growth ; Sexual maturity ; Mortality ; Echo surveys ; Biomass ; Sexual maturity ; Growth ; Mortality
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 7
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    Muestreo de desembarque de caballa (Scomber japonicus) en el puerto de Mar del Plata, período noviembre 2003-diciembre 2004 y resultados de la campaña de estimación de la biomasa de diciembre de 2004 (2010)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: Chub mackerel (Scomber japonicus) landings corresponding to November 2003-January 2004 and November 2004-January 2005 fishing seasons were analyzed at the Mar del Plata port (Argentina, SW Atlantic). Fourty one samples were taken to measure total length exclusively and 4 sub-samples to record individual data (total length, weight, sex, sexual stage, age according to otoliths reading). Total length ranged 20-50 cm (1 and 8 years old). The most abundant sizes, between 32-37 cm, corresponded to ages 3 and 4, respectively. Most of the fish caught were adult (95%) and mature (85%) specimens. Length-weight, length-age relations were calculated and length-growth, weight-growth parameters estimated. The catch per unit of effort, of high variability (0-2,455 kg h-1), decreased as sea surface temperature increased. To estimate the species biomass in the fishing area a research cruise was carried out between 17-20 December 2004. Measurements, obtained with acoustic methods, reached a total of 11,678 t. The highest concentrations were found at a temperature of around 17.4 ºC and salinity of 33.62 psu. During the acoustic tracking, unusual concentrations of anchovy for the season were detected.
    Description: En el puerto de Mar del Plata (Argentina, Atlántico SO) se analizaron los desembarques de caballa (Scomber japonicus) correspondientes a las temporadas de pesca noviembre 2003-enero 2004 y noviembre 2004-enero 2005. Se tomaron 41 muestras para medir la longitud total exclusivamente y 4 submuestras para registrar datos individuales (longitud total, peso, sexo, estadio gonadal, edad según lectura de otolitos). La longitud total fue de entre 20-50 cm (1 y 8 años de edad). Las clases de talla más frecuentes, de entre 32-37 cm, correspondieron a las edades 3 y 4, respectivamente. Los principales componentes de las capturas fueron individuos adultos (95%) y maduros (85%). Se calcularon las relaciones talla-peso y talla-edad y se estimaron los parámetros de crecimiento en longitud y en peso. La captura por unidad de esfuerzo, de gran variabilidad (0-2.455 kg h-1), disminuyó a medida que aumentó la temperatura de superficie del mar. Con el fin de estimar la biomasa de la especie en el área de pesca se llevó a cabo una campaña de investigación entre el 17 y el 20 de diciembre de 2004. Las mediciones, obtenidas con métodos acústicos, alcanzaron un total de 11.678 t. Las mayores concentraciones se encontraron a una temperatura de alrededor de 17,4 ºC y salinidad de 33,62 ups. Durante el recorrido acústico se detectaron importantes concentraciones de anchoíta, inusuales para la época.
    Description: Published
    Description: Scomber japonicus, caballa, estadísticas de desembarque, muestreo biológico, crecimiento, esfuerzo pesquero, biomasa, relevamientos ecoicos
    Keywords: Growth ; Biomass ; Fishing effort ; Landing statistics ; Biological sampling ; Growth ; Fishing effort ; Echo surveys ; Biomass
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 8
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    Observaciones sobre la distribución vertical y caracterización de los registros ecoicos de algunas especies de peces costeros en la plataforma bonaerense. November 1994 (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: Acoustic data were recorded by means of a scientific echosounder, during a survey carried out with R/V Dr. E.L.Holmberg in the coastal region off Buenos Aires, Argentina. Data were obtained in correlation with bottom trawl stations, aiming at characterizing the echo recording of several coastal fish species. Echo recording of the following species could be identified: white croaker Micropogonias furnieri, striped weakfish Cynoscion striatus, horse mackerel Trachurus lathami and red porgy Sparus pagrus. From these, some aspects of fish behaviour are described.In situ target strength measurements were taken with a split-beam transducer for striped weak fish, obtaining mean values of -43.9 dB and -42.9 dB for fish with mean length 17.0 cm and 18.5 cm respectively.
    Description: Lasta, C.A., ed. 1998. Resultados de una campaña de evaluación de recursos demersales costeros de la Provincia de Buenos Aires y del litoral Uruguayo. Noviembre, 1994.INIDEP Informe Técnico.21: 141 p.
    Description: Published
    Keywords: Echosounding ; Coastal fisheries ; Echo surveys ; Marine fish ; Echosounding ; Vertical distribution ; Coastal fisheries
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 9
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    Acoustic surveys on the southern blue whiting (Micromesistius australis). (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: Two joint Argentine-British acoustic surveys specifically targeted on the southern blue whiting (Micromesistius australis) were carried out during September 1994 and 1995. The surveys confirmed the existence of a spawning concentration area located south from San Carlos Strait, in waters south of Malvinas Islands, ASW. The obtained point estimates of blue whiting abundance were 84801 t for the 1994 survey and 140953 t for the 1995 survey. The surveys also provided information on the school structure and behavior as well as some clues about the complex migration pattern of the species.
    Description: Sánchez, R.P.; ed. 1999. Reproductive habitat, biology and acoustic biomass estiomates of the southern blue whiting (Micromesistius australis) in the sea off southern patagonia. INIDEP Documento Científico, 5: 93 p.
    Description: Published
    Description: Gadiformes, Gadidae, Micromesistius australis, polaca, relevamientos pesqueros, relevamientos ecoicos, distribución geográfica, biomasa, fuerza de blanco
    Keywords: Biomass ; Geographical distribution ; Fishery surveys ; Echo surveys ; Biomass ; Geographical distribution ; Target strength
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 10
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    La caballa (Scomber japonicus) y las condiciones ambientales en el area bonaerense de El Rincón (39°- 40°30' S), agosto 1996. (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: In 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.
    Description: Publisher permission
    Description: Published
    Description: Scombridae, Scomber japonicus, caballa, zooplancton, relevamientos ecoicos, condiciones ambientales, biomasa, abundancia, estructura poblacional
    Keywords: Biomass ; Population structure ; Zooplankton ; Environmental conditions ; Abundance ; Biomass ; Population structure ; Zooplankton ; Environmental conditions ; Echo surveys
    Repository Name: AquaDocs
    Type: Journal Contribution
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