Résultats de la recherche
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Models of tag shedding for double tagging as a function of time at liberty and approximate solutions for the single tagging model in CASAL
Abstract: The model of tag shedding implicit in CASAL is that of Kirkwood and Walker (KW) (1984 ... ) and Hillary et al. (2006) to apply the square of the individual tag loss annual rate in CASAL over ... a large sample of recaptures of fish released in the Heard and MacDonald Island (HIMI) (Division ... (GAM) was also fitted and is the most flexible in shape. The estimation method accounts for the fact ...
Meeting Document : WG-SAM-11/12 : Auteur(s): S.G. Candy (Australia)
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DATA QUALITY ASSESSMENT IN CCAMLR: REQUIREMENTS FOR MINIMUM INTEGRITY TESTING TO ENSURE THAT DATA ARE FIT FOR PURPOSE
confirmation of their validity. In the context of CCAMLR, data may undergo one set of quality testing in order ... important for prioritizing the work of the Secretariat in data quality assessment, and also in ensuring that ... errors and discrepancies are resolved in consultation with data owners/originators and, where possible ... errors in fishery data which originated at the vessel-level, and indicated that some errors were not ...
Meeting Document : WG-SAM-09/05 : Auteur(s): Secretariat
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Escapement of elephant seal prey in the Heard Island fishery for Dissostichus eleginoides
Elephant seals in the Heard Island region. A question was raised at SC-CAMLR-XV concerning what affect the ... fishery for toothfish in Division 58.5.2 might have on the abundance of the age classes of toothfish ... of 3800 tonnes. Of 21 otoliths found in Elephant Seal stomachs at Heard Island that have previously ... reliably and related to a specific size class of fish. However, it seems that toothfish in the age range of ...
Meeting Document : WG-EMM-97/42 : Auteur(s): Slip, D., Constable, A.J., de la Mare, W.K., Williams, R.
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Sexual ratio of Dissostichus eleginoides from longlines samples: a partial indicator of reproductive migration in Subarea 48.3
and the third week of July 1996, in the subarea 48.3 shows that the sex ratio departs from the ... expected 1:l ratio being the females more abundant in the longline samples, except during May, when the ... bottom habitats, this finding suggests that: or the females remain in higher proportion in the habitat ... the longline fishing techniques, or both sexes rise in the water column for spawn. No one of these ...
Meeting Document : WG-FSA-96/44 : Auteur(s): Moreno, C.A., Guerra, J., Zuleta, A.
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Change-in-ratio and index-removal methods for population assessment and their application to snow crab (Chionoecetes opilio)
Abstract: Change-in-ratio and index-removal estimators are presented in a general form suitable ... for fisheries studies. We also show how to combine the two approaches in a single estimator. It is ... composition, in order to use these methods. We use the methods to estimate the population of legal-size snow ... crabs (Chionoecetes opillio) in St. Mary's Bay, Newfoundland, before and after the fishery, and to ...
Meeting Document : WS-CRAB-93/10 : Auteur(s): X. Xu, E.G. Dawe and J.M. Hoenig (USA)
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Annual variation in breeding biology of gentoo penguins, (Pygoscelis papua) at Bird Island, South Georgia
later in 1987, when the breeding population decreased markedly. Factors involved in the timing of ... breeding are discussed. Within years egg-laying was highly synchronous: 95% of clutches were initiated in ... breeding population at Bird Island decreased by 20% and increased by 84% in successive years during the ... varied annually, and with age of the breeding bird, nest location and, in one year, with laying date ...
Meeting Document : WG-CEMP-90/38 : Auteur(s): T.D. Williams (United Kingdom)
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Analysis of operating conditions of the fishing vessel in relation to the distribution, biological state and behaviour of Antarctic krill (a contribution to the development of a simulation model)
processing vessel producting krill meat. The vessel operated in the Commonwealth Sea, the Cosmonaut Sea and ... in twi Scotia Sea areas (off South Orkneys and off South Georgia) from February to June 1988. In all ... cause was tthe size composition of krill in the catches. Preference was given to larger krill. The ... density of krill in aggragtions usually remained at a high level and was a less important cause of area ...
Meeting Document : SC-CAMLR-VIII/BG/23 : Auteur(s): Delegation of USSR
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Update on the ‘Demersal interactions with marine benthos in the Australian EEZ of the Southern Ocean: an assessment of the vulnerability of benthic habitats to impact by demersal gears’ project
Abstract: We provide an update on progress in the FRDC and industry-funded project “Demersal ... interactions with marine benthos in the Australian EEZ of the Southern Ocean: an assessment of the ... vulnerability of benthic habitats to impact by demersal gears”. This project commenced in 2006 and is due to ... conclude with the publication of a final report in late 2011. Outputs of this project, including novel ...
Meeting Document : WG-EMM-10/23 : Auteur(s): G.P. Ewing, D.C. Welsford and A.J. Constable (Australia)
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Recent trends in numbers of Crozet shags breeding at the Prince Edward Islands
decreased by more than 70% from 840 pairs in 1994/95 to 220 pairs in 2003/04 and then increased to some 500 ... pairs in 2008/09. The trends are thought to have been influenced by breeding success, which averaged ... were similar trends in numbers breeding and breeding success of gentoo penguins Pygoscelis papua, which ... doubled between the summers of 2001/02 and 2008/09. In 2008/09, some 600 pairs of Crozet shags were ...
Meeting Document : WG-EMM-10/P02 : Auteur(s): R.J.M. Crawford, P.G. Ryan, B.M. Dyer and L. Upfold
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Further development of a spatially explicit population dynamics operating model for Antarctic toothfish in the Ross Sea region
younger fish were found predominantly in southern areas of the Ross Sea shelf, mature fish on the slope ... and spawning fish in the northern areas of the Ross Sea region. Fits to the observations were ... generally good. Further investigations are recommended in order to further validate and refine this model ... data in areas not fished to date. In addition, further external validation diagnostics need to be ...
Meeting Document : WG-SAM-13/35 : Auteur(s): S. Mormede, A. Dunn, S. Parker and S. Hanchet (New Zealand)