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dc.contributor.authorPortela, J. (Julio) 
dc.contributor.authorPierce, G.J. (Graham John) 
dc.contributor.authorAgnew, D. (David)
dc.contributor.authorArkhipkin, A. (Alexander)
dc.contributor.authorBellido-Millán, J.M. (José María) 
dc.contributor.authorWang, J. (Jianjun)
dc.contributor.authorMiddleton, D. (David)
dc.contributor.authorSantos, M.B. (María Begoña) 
dc.contributor.authorUlloa, E. (Edelmiro)
dc.contributor.authorOtero, M. (Montserrat)
dc.contributor.authorTato, V. (Vicente)
dc.coverage.temporal1987-2001es_ES
dc.date.accessioned2012-11-12T10:42:01Z
dc.date.available2012-11-12T10:42:01Z
dc.date.issued2012-11-12
dc.identifier.urihttp://hdl.handle.net/10508/971
dc.description.abstractStudy Project 99/016 “Data collection for stock assessment of two hakes (Merluccius hubbsi and M. australis) in international and Falkland waters of the SW Atlantic” ran from January 2000 to December 2001. The main objective of the project was the collection and collation of already existing and newly acquired fishery and biological data needed for preliminary assessment of two hake species occurring in the study area. In addition to this basic remit, additional objectives included the creation of a common database, study of spawning seasons and areas, discard pattern and length-frequency composition of target and non-target species, estimation of annual by-catch rates, analysis of trophic relationships, marine mammals by-catch and sightings, morphometric analysis for stock differentiation, and developing GIS applications for analysis of the data collected. Historical fishery and biological data series available from IEO and FIGFD (since 1988 and 1987 respectively) were provided to the project. New fishery and biological data were collected by scientific observers provided by IEO, ANAMER and FIGFD, and placed on board Spanish fishing vessels operating in the study area during the project period. Data on fishing activity included effort, catches and discards of target and non-target species on a haul-by-haul basis. Biological information (size, sex, maturity stage, etc) of target and non-target species was recorded on a daily basis. Data on landings and effort were provided by ANAMER to its subcontractor (MG OTERO) for processing and estimation of total catch and effort of the whole Spanish fishing fleet in the area; MG OTERO was also responsible for organisation of observers in collaboration with ANAMER staff in Vigo and Port Stanley. Ancillary data on location, time of fishing, depth, SST, SBT, sea roughness, wind, etc, was recorded on a haul-by-haul basis. This type of information was essential for development of GIS at AU to relate the species distribution to physical and environmental factors. Other information collected was about by-catches and sightings of small cetaceans and seabirds, and biological samples such as otoliths, stomachs and whole specimens of hakes for subsequent studies on growth (IEO, FIGFD), diet and morphometrics (AU). All the historical and new data collected during the project were collated and integrated into a common database designed by all participants and built at IEO. The information was used for preliminary assessment of two hake populations co-ordinated by RRAG during a workshop held in London in July 2001. All these data will be analysed and written up for future publications. Discard rates of target species were generally low in all areas and seasons with the highest discard rate for Notothen sp. (around 100% of the catch). Illex squid was found to be the major by-catch for hake fishery in the 46 S area. IEO observers reported data on incidental catches of marine mammals and sea birds since 1993 and the analysis of this information was made by AU. The observed mortality in the fishing gears comprised small numbers of black-browed albatross, gentoo penguin and the hourglass dolphin. The species most frequently sighted was the Peale’s dolphin, although this species did not appear in by-catches, followed by the hourglass dolphin. The project provided an opportunity to collect and integrate for the first time at European level the necessary fishery and biological data for the development of partial stock assessment for the future rational management of the fisheries in the area. Such management is needed for the sustainability of the commercial fisheries, the conservation of the onshore and offshore jobs and the supply of fish to the most important markets worldwide.es_ES
dc.description.sponsorshipEUROPEAN COMMISSION DIRECTORATE GENERAL FISHERIES – DG XIVes_ES
dc.language.isoenges_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 Españaes_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/es_ES
dc.subjectSouth West Atlantic,es_ES
dc.subjectSpanish fishing fleet,es_ES
dc.subjectHakeses_ES
dc.subjectCepholopodses_ES
dc.subjectCPUEes_ES
dc.subjectDiscardses_ES
dc.subjectLength-weightes_ES
dc.subjectBy-catches_ES
dc.subjectSpawning seasones_ES
dc.subjectDistributiones_ES
dc.subjectTrophic patternes_ES
dc.subjectGrowthes_ES
dc.subjectGISes_ES
dc.subjectStock assessmentes_ES
dc.subjectMarine mammalses_ES
dc.subjectMorphometric analysises_ES
dc.titleData collection for stock assessment of two Hakes (Merluccius Hubbsi and M. Australis) in international and Falkland Waters of the SW Atlantices_ES
dc.typeprojectes_ES
dc.publisher.centreCentro Oceanográfico de Vigoes_ES
dc.coverage.spatialStudyAtlantic Oceanen_US
dc.coverage.spatialStudySouth Atlanticen_US
dc.coverage.spatialStudySouthwest Atlanticen_US


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