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A drift study of vertical distribution and mortality of Engraulis anchoita eggs and larvae. OceanDocs
Sánchez, R.P.; de Ciechomski, J.D.; Lasta, C.A.; Guerrero, R.A..
Lagrangian changes in distribution and survival within an anchovy egg and larvae patch were studied by means of multiple opening/closing sampling following a free drifting buoy. The buoy was equipped with a radar reflector and flashing light, and it was connected to a current cross drogue floating at 15 m depth, which corresponded to the main egg and larvae concentration within the patch. The drifter was launched on the Buenos Aires continental shelf, off Necochea during the spring spawning peak of 1983. Three discrete depths (within, below and above the thermocline)were repeatedly sampled close to the drogue with a Motoda sampler. Egg and larval abundances in the vicinity of the drogue were monitored at 3/4 hour intervals for a period of three days. Each...
Tipo: Journal Contribution Palavras-chave: Fish larvae; Fish eggs; Vertical migrations; Feeding; Environmental effects; Ichthyoplankton surveys; Vertical distribution; Survival; Abundance; Drifting data buoys; Fishery surveys; Feeding; Fish larvae; Survival; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_7538.
Ano: 1999 URL: http://hdl.handle.net/1834/1871
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A transboundary study of the pelagic fish stocks of southern OceanDocs
Krakstad, Jens-Otto; Amaro, Aristóteles P. da S.; Shigwedha, Vaino.
The main objectives of the survey were the following: • To map the distribution and estimate the abundance of the most commercially important pelagic species in the Namibia-Angola transboundary area (15°50-19°00’), following the survey design utilized in Angolan waters (6 n.mi spacing between transect lines), with special emphasis on the two horse mackerel Cunene horse mackerel (Trachurus trecae) and Cape horse mackerel (Trachurus capensis), sardine “Pilchard” (Sardinops sagax) and other small pelagic species, including anchovy (Engraulis capensis) and round herring (Etrumeus whiteheadi). • To map the distributions and estimate the abundance of the same species in central Namibia south to Dune Point (20°15’ S), following the established survey design with...
Tipo: Report Palavras-chave: Pelagic fisheries; Fishery surveys; Acoustics; Sampling; Trawls; Oceanography; Biomass; Distribution; Composition.
Ano: 2012 URL: http://hdl.handle.net/1834/5230
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Abondonce relative et estimation de la biomasse des petits pelagiques des eaux tunisiennes OceanDocs
Hattour, A.; Ben Abdallah, L.; Guennegan, Y..
Within the frame of the National Program (PNM), 'Assessment of Marine Tunisian Resources' (1996-1999), two prospecting surveys on small pelagic fishes, have been led in narrow collaboration with French Institute IFREMER. Their objectives were to specify the relative fishes abundance, their spatial-temporal variability but also to quantify the maximum sustainable yield (MSY) of this resource. A third important goal was to familiarize a Tunisian scientist team, with numerical methods and data processing used during the cruises (reading of echograms, treatments of data, etc.) in stocks assessment. It is known that the indirect stocks assessment methods of small pelagic species is not reliable, reason for which we opted to apply echo - integration techniques....
Tipo: Journal Contribution Palavras-chave: Abundance; Biomass; Fishery surveys; Pelagic fisheries; Potential yield; Stock assessment; Biomass; Stock assessment; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 2004 URL: http://hdl.handle.net/1834/4237
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Abundancia relativa y distribución de tallas de corvina rubia Micropogonias furnieri y pescadilla de red Cynoscion striatus en la Zona Comun de Pesca Argentino-Uruguaya y en el Rincón. Noviembre, 1994. OceanDocs
Carozza, C.R.; Cotrina, C.P..
The study aims to discriminate juvenile and adult concentration areas of white croacker Micropogonias furnieri and striped weakfish Cynoscion striatus in two different areas: Argentine-Uruguayan Common Fishing Zone (AUCFZ) and El Rincón (Buenos Aires Prov., Argentina). The length structure and the relative abundance of these two species were analyzed with data from a research cruise carried out by R/V Dr.E.L.Holmberg during November 1994. Data of relative abundance in t/nm2 were considered to define distribution and concentration areas. 49 samples of white croaker and 41 striped weakfish from AUCFZ a, inside the area of Río de la Plata and in front of Montevideo coast, at depths lesser than 8 meters, while the adults were located in the northern coast of...
Tipo: Journal Contribution Palavras-chave: Abundance; Fishery surveys; Size distribution; Coastal fisheries; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 1998 URL: http://hdl.handle.net/1834/2472
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Abundancia, reproducción y distribucion de tallas del gatuzo Mustelus schmitti en la Zona Comun de Pesca Argentino-Uruguaya y en el Rincón. Noviembre, 1994 OceanDocs
Cousseau, M.B.; Carozza, C.R.; Macchi, G.J..
Relative abundance, length distributions and reproductive condition of Mustelus schmitti are analyzed with samples obtained in the cruise H-13/94. Our results are compared with those obtained in other cruises. The samples were collected in the Argentine-Uruguayan Common Fishing Zone (AUCFZ) and El Rincón (Buenos Aires Prov., Argentina).
Tipo: Journal Contribution Palavras-chave: Abundance; Reproduction; Fishery surveys; Size distribution; Reproduction; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1998 URL: http://hdl.handle.net/1834/2475
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Acoustic surveys on the southern blue whiting (Micromesistius australis). OceanDocs
Madirolas, A..
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.
Tipo: Journal Contribution Palavras-chave: Fishery surveys; Echo surveys; Biomass; Geographical distribution; Target strength; Biomass; Geographical distribution.
Ano: 1999 URL: http://hdl.handle.net/1834/2567
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Acoustic surveys on the southern blue whiting (Micromesistius australis). OceanDocs
Madirolas, A..
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.
Tipo: Journal Contribution Palavras-chave: Fishery surveys; Echo surveys; Biomass; Geographical distribution; Target strength; Biomass; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 1999 URL: http://hdl.handle.net/1834/2567
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Análisis de la estratificación empleada en campañas de evaluación de recursos demersales costeros en la Zona Común de Pesca Argentino-Uruguaya y en El Rincón, 1994 OceanDocs
Perrotta, R.G.; Lasta, C.A.; Aubone, A..
The data belong to the demersal fishery research cruise H-13/94. Stratification used for research surveys from the catches values was tested, both for the northern area, Argentine-Uruguayan Common Fishing Zone (AUCFZ) located between 34° and 39°S, and the southern area situated between 38°30' and 41°30'S (El Rincón, Buenos Aires Prov., Argentina). The variables considered were: croaker and striped weak fish densities and depth. Discriminant factor analysis indicates the formation of two and six strata for the southern and northern areas respectively. The adequate confidential limits of the estimated biomass for each strata obtained for different species, indicate that the criteria for stratification is satisfactory. The number of catches by strata was...
Tipo: Journal Contribution Palavras-chave: Fishery surveys; Coastal fisheries; Demersal fisheries; Statistical sampling; Variance analysis; Surveys; Demersal fisheries; Coastal fisheries; Surveys; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_1696; Http://aims.fao.org/aos/agrovoc/c_7537.
Ano: 1998 URL: http://hdl.handle.net/1834/2470
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Análisis y diagnóstico del diseño de muestreo de las campañas de evaluación de merluza (Merluccius hubbsi) al norte y al sur de los 41°S (Zona Comun de Pesca Argentino-Uruguaya y Mar Argentino). Años 1996-1999 OceanDocs
Hernandez, D.R.; Bezzi, S.I.; Ibañez, P.M..
Gain contribution by stratification in hake (Merluccius hubbsi) biomass estimation with respect to a simple random sampling based on the same sample size is analyzed. Considering as objective hake biomass assessment, curves which relate precision reached in estimations to the sample size are established. Data were from total hake biomass surveys carried out from 1996 through 1999 hake management units distributed North and South of 41°S Argentine Sea are analyzed separately. Stratification used at present allows to obtain very variable gains in precision associated to biomass with estimations, in the North management unit, with a maximun of 88 in 1996 and no gain in 1997. The South management unit presents also variable results but always with important...
Tipo: Journal Contribution Palavras-chave: Gadoid fisheries; Fishery surveys; Biomass; Statistical sampling; Stock assessment; Biomass; Stock assessment; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_24251.
Ano: 2003 URL: http://hdl.handle.net/1834/2401
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Analyse de l'indice d’abondance des principales espèces de sparidés à travers les campagnes de chalutage de 1982 à 1992 OceanDocs
Ould Mohamed Fall, K..
Résumé : L’indice d’abondance des principales espèces de sparidés pêchées en Mauritanie a été suivi dans les campagnes de chalutage démersal du CNROP en saison froide, chaude et transition, durant la période allant de 1982 à 1992. Des affinités par zone (cas de Diplodus bellottii, Pagellus bellottii, et Sparus caeruleostictus) et par saison (Dentex macrophtalmus) ont été observées. Un indice moyen mensuel a été dégagé pour les 6 espèces étudiées et les aires de distribution ainsi que les zones d’abondance déterminées.
Tipo: Journal Contribution Palavras-chave: Spatial distribution; Abundance; Trawlers; Fishery surveys.
Ano: 1995 URL: http://hdl.handle.net/1834/255
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Analyse descriptive de la pêcherie du golfe de Tunis OceanDocs
Ben Abdallah, L.; El Abed., A.; Zarrad., R.; Missaoui., H.; Gharbi., H..
Ce travail décrit les résultats de la campagne de pêche benthique dans le golfe de Tunis. Durant la campagne de 1999, les ressources benthiques du golfe sont exploitées par 45 chalutiers. Ces unités ont enregistré une production de 590 tonnes qui est voisine à celle de deux années précédentes. Les débarquements sont constitués essentiellement de merlu Merluccius merluccius , rouget blanc Mullus barbatus, saurel Trachurus sp., chevrette Parapenaeus longirostris, pageot Pagellus sp. et spicarel Spicara sp. Le chalutage expérimental dans le golfe a donné un rendement horaire de 45Kg et un pourcentage de rejet évalué à 16%. L'étude des structures démographiques des principales espèces montre que l'exploitation dans le golfe s'effectue sur des groupes d'âge...
Tipo: Journal Contribution Palavras-chave: Gadoid fisheries; Carangid fisheries; Mullet fisheries; Bottom trawling; Catch composition; Fishery surveys; Spicara; Trachurus; Merluccius merluccius; Parapenaeus longirostris; Mullus barbatus; Pagellus; Http://aims.fao.org/aos/agrovoc/c_33883; Http://aims.fao.org/aos/agrovoc/c_7842; Http://aims.fao.org/aos/agrovoc/c_41529; Http://aims.fao.org/aos/agrovoc/c_46329; Http://aims.fao.org/aos/agrovoc/c_43349; Http://aims.fao.org/aos/agrovoc/c_5502.
Ano: 2000 URL: http://hdl.handle.net/1834/4297
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Caracterización del proceso de descarte de merluza (Merluccius hubbsi) en la flota de buques congeladores y factorías. Resultados preliminares a partir de los datos recolectados por observadores del INIDEP en seis mareas realizadas entre agosto y diciembre de 1995. OceanDocs
Cañete, G.R.; Dato, C.V.; Villarino, M.F..
Pursuant to SAGyP resolution No. 814/93, during August-December 1995, six INIDEP Fishery Observers trips on board of processing vessels of the Argentine fleet were carried out. They represented 256 navigation days, 232 effective fishing days, 725 fishing trawls and 2,245 trawling hours. Data measured on board were compared to those reported in the fishing log corresponding to the same cruise and submitted to the DNPyA by the Skipper. Catches observed and reported differ by 3985,7 t (28.2. ), with a maximum difference of 1,200 t in a single cruise. In the case of trawling hours, an important fluctuation of values was observed and, in two cases, the number of hours declared exceeded those actually performed (111 and 72). In the other four cruises, between 3...
Tipo: Journal Contribution Palavras-chave: Factory ships; Fishery surveys; Research programmes; By catch; Catch/effort; Fish catch statistics; Gadoid fisheries; Factory ships; Http://aims.fao.org/aos/agrovoc/c_10732.
Ano: 2000 URL: http://hdl.handle.net/1834/2535
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Consilient knowledge in fisheries: a case study of three species of wolffish (Anarhichadidae) listed under the Canadian Species at Risk Act Ecology and Society
Dawe, Jennifer; Memorial University of Newfoundland and Labrador; jennifer.dawe@gmail.com; Schneider, David; Memorial University of Newfoundland and Labrador; David.Schneider@mun.ca.
Tipo: Peer-Reviewed article Palavras-chave: Bycatch; Fishery surveys; Local ecological knowledge; Species at risk; Wolffish.
Ano: 2014
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Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994. OceanDocs
Barrera-Oro, E.; Casaux, R.; Roux, A..
The diet composition of the icefish Champsocephalus gunnari caught around the South Georgia Islands and Shag Rocks, Atlantic sector of Antacrtica in February/March 1994 was analyzed using the frequency of occurrence (. ) method. Krill Euphausia superba followed by the hyperiid amphipod Themisto gaudichaudii were the main prey items at South Georgia and Shag Rocks; first were found in thestomachs more frequently than in past seasons around South Georgia,in parallel with the virtual absence of mysids and Thysanoessaspp. Krill was available for fish at the same level than in previous years (e.g. 1985, 1992). However, high proportion of empty stomachs were found at South Georgia and Shag Rocks, close to the values reported for the 1991 year of krill...
Tipo: Journal Contribution Palavras-chave: Feeding; Food preferences; Stomach content; Fishery surveys; Feeding; Food preferences; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_3024.
Ano: 1997 URL: http://hdl.handle.net/1834/1931
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Distribución de los morfotipos gregaria y subrugosa de la langostilla Munida gregaria (Decapoda, Galatheidae) en el golfo San jorge en la campaña de verano AE-01/2011. Integración de resultados con las campañas 2009 y 2010 OceanDocs
De la Garza González, J.L.; Ravalli, C.; López Greco, L..
The objective of this work is to increase knowledge on the distribution and punctual density of both morphotypes of Munida gregaria in the San Jorge Gulf, Argentina. The data derived from the research cruise carried out on board of the FV Álvarez Entrena I in February 2011. Specimens of gregaria and subrugosa were caught in 37 and 73 of the 91 trawls performed, respectively. Out of the total of positive trawls, 17 were performed at depths lower than 55 m and the remaining 60 at deeper waters. The relative average abundance of both morphotypes increased significantly with regard to the two previous years (2009, 2010). M. gregaria subrugosa represented 66.4% and gregaria the remaining percentage. In the south sector of the gulf, where the highest punctual...
Tipo: Journal Contribution Palavras-chave: Biogeography; Abundance; Size distribution; Fishery surveys.
Ano: 2013 URL: http://hdl.handle.net/1834/5487
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Distribución estacional y estructura de tallas del abadejo Genypterus blacodes en el Mar Argentino OceanDocs
Villarino, M.F..
The main purpose of this paper is to describe the seasonal distribution and length structure of the Pink cuskeel Genypterus blacodes. Data from surveys carried out between 1973-1989 were used. Basic data included Pink cuskeel densities per haul, catch length structure, depth and haul position. Pink cuskeel distribution was obtained by using the same density ranges for all seasons. A cluster analysis was applied to group the individual length structure of each survey catch. All year long the principal concentrations were within 40° and 48°S. Throughout the year the adults and juveniles were present in San Jorge Gulf, Patagonia, Argentina, so bimodal distribution were obtained. In winter juveniles were located within the sector 37° and 41°S. During autumn,...
Tipo: Journal Contribution Palavras-chave: Size distribution; Geographical distribution; Fishery surveys.
Ano: 1998 URL: http://hdl.handle.net/1834/5787
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Distribución y abundancia de huevos y larvas de langostino patagónico (Pleoticus muelleri) (Penaeoidea, Solenoceridae) en las temporadas estivales de 2008 y 2009 OceanDocs
Moriondo Danovaro, P..
The study on distribution and abundance of eggs and early planktonic stages of red shrimp, Pleoticus muelleri (Bate, 1888), contributes to a better knowledge of the species dynamics. Results from processing and analyzing 72 plankton samples collected with Bongo net during two research cruises on board of FV “Arbumasa XVIII” and RV “Capitán Oca Balda”, carried out in the Patagonian littoral in March 2008 and January 2009, are presented. In both cruises, eggs and larval stages were found all over the study area. The highest punctual densities of eggs were recorded in the area known as “La Pared” (46° 45’ S-65° 55’ W and 46° 50’ S-65° 55’ W). Eggs indicate the presence of shrimp reproductive concentrations which, while migrating eastwards towards waters of...
Tipo: Journal Contribution Palavras-chave: Fish larvae; Eggs; Abundance; Fishery surveys; Pleoticus muelleri; Marine environment.
Ano: 2011 URL: http://hdl.handle.net/1834/4880
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Ecological distribution of the shrimp camarao serrinha Artemesia longinaris (Decapoda, Penaeidae) in Fortaleza bay, Ubatuba, Brazil, in relation to abiotic factors OceanDocs
Fransozo, A.; Costa, R.C.; Castilho, A.L.; Mantelatto, F.L..
The spatial and temporal distribution of the shrimp Artemesia longinaris in Fortaleza Bay, northern coast of Sao Paulo State, Brazil, in relation to abiotic factors, was studied. Shrimp samples were obtained on a monthly basis from November 1988 through October 1989 at seven pre-delimited transects on board of a fishing vessel supplied with double otter trawl nets. Depth was recorded at the midpoint of each transect; water and sediment samples were taken to measure salinity, temperature, texture and organic matter content of sediment. The shrimps obtained in the trawls were sorted, identified and 100 g subsample at each transect was separated for measurements (carapace length). A total of 3,083 individuals were obtained. Shrimps were more abundant from...
Tipo: Journal Contribution Palavras-chave: Abiotic factors; Ecological distribution; Shrimp fisheries; Fishery surveys; Abundance.
Ano: 2004 URL: http://hdl.handle.net/1834/1537
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Estandarización de la captura de centollón (Paralomis granulosa) por trampa con distintos tiempos de pesca en el Canal Beagle, Argentina OceanDocs
Firpo, C.; Wyngaard, J.; Iorio, M.I..
To standardize false king crab catch rates and transform them into abundance indices it is essential to count on a model that adequately describes the relation between catch per trap and fishing time. Considering data derived from research surveys carried out on board of the artisanal fleet in the Beagle Channel, assuming an asymptotic catch trend and absence of escape, to describe the relation an exponential model was applied. The Coo (asymptotic catch) and a (income rate) parameters of the model allowed to build a correction factor to transform the catches obtained with different fishing times into relative abundance indices. The model provides, besides, the optimum time to maximize catches. Para estandarizar las tasas de captura de centollón y...
Tipo: Journal Contribution Palavras-chave: Fishing time; Trap nets; Catch statistics; Models; Fishery surveys; Abundance; Paralomis granulosa; Marine environment.
Ano: 2014 URL: http://hdl.handle.net/1834/5822
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Estimación de parámetros poblacionales del efectivo de sardina fueguina (Sprattus fuegensis) de la costa continental Argentina. OceanDocs
Hansen, J.E..
Patagonian sprat is probably the only pelagic fish species having a considerable biomass within the Argentine Seasouth of 45ºS. There are two populations, the first inhabiting mainly the coastal region around Malvinas Islands and the other close to the coast off Santa Cruz and Tierra del Fuego Provinces, including the fuegian channels. Some results of two seasonal (autumn and spring) patagonian sprat assessment surveys carried out during 1996 are shown. The autumn cruise covered the area between 50° and 55°S, from the continental coast up to 60 m depth, whereas the spring survey extended upto 90 m depth including Le Maire Strait and part of the Beagle Channel. During both seasons, in waters ranging 6.2 - 8.8°C temperature, the species distributed very...
Tipo: Journal Contribution Palavras-chave: Fishery surveys; Length-weight relationships; Sexual maturity; Growth; Mortality; Growth; Sexual maturity; Mortality; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1999 URL: http://hdl.handle.net/1834/2530
Registros recuperados: 50
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