Résultats de la recherche
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Methodological aspects of the International Synoptic Krill Survey in Area 48, 2019
Abstract: The effect of differences in the methodology used for the CCAMLR 2000 krill acoustic ... survey and the 2019 synoptic survey were considered. These were 1) the effect of acoustic surveying at ... night, 2) differing trawl selectivity between the vessels that participated in the survey, and 3) the ... effect of krill discrimination method. Surveying during the day only produced a 6% increase in the ...
Meeting Document : SG-ASAM-2019/10 : Auteur(s): G. Macaulay, G. Skaret, T. Knutsen and B. Krafft
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An integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) in Division 58.5.2 using CASAL
Division 58.5.2. It updates the model used at WG-FSA in 2006 using data from the 2007 season as well as ... 2006 data not available for WG-FSA in 2006. It also includes the following refinements: (i) estimation ... of the coefficient of variation (CV) for length given age, (ii) use of non-informative priors for ... year class strength parameters, (iii) separate selectivity parameters used for the pre-2006 compared to ...
Meeting Document : WG-FSA-07/53 Rev. 1 : Auteur(s): S.G. Candy and A.J. Constable (Australia)
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Haul data analysis from the Polish krill fishery in 1997–1999
Abstract: The analysis of fishing data obtained from the ship’s log of the Polish commercial ... vessel M/T Pollux facilitated the characterization of catches and concentrations of krill between ... and since the vessel carried out catches along with other Polish vessels, the results describe Polish ... catches in this period and area. Each fishing season was different. In 1997 the catches were carried out ...
Meeting Document : WG-EMM-00/17 : Auteur(s): E. Jackowksi (Poland)
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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 ... ) which models the annual tag shedding (i.e. loss) rate as a constant for individual tags. The CASAL ... software applies this model correctly for fish released with a single tag but does not have the facility at ... present to correctly apply the KW model for fish released with two tags. The solution of Dunn et al. (2005 ...
Meeting Document : WG-SAM-11/12 : Auteur(s): S.G. Candy (Australia)
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A characterisation of the toothfish fishery in Subareas 88.1 and 88.2 from 1997–98 to 2010–11
Abstract: The exploratory fishery for Dissostichus spp. has now been operating for fifteen years ... in Subarea 88.1 and for ten years in Subarea 88.2. This report summarises the timing, depth, and ... location of fishing together with the catch of Dissostichus spp. and bycatch species by year for the period ... 1997–98 to 2010–11. During the 2010–11 fishing year most of the catch in Subarea 88.1 came from the ...
Meeting Document : WG-FSA-11/45 : Auteur(s): M.L. Stevenson, S.M. Hanchet, S. Mormede and A. Dunn (New Zealand)
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INCORPORATING SAMPLING VARIATION AND RANDOM READER ERROR INTO CALCULATION OF EFFECTIVE SAMPLE SIZE IN THE APPLICATION OF AGE LENGTH KEYS TO ESTIMATION OF CATCH-AT-AGE PROPORTIONS
observations that contribute to the objective function via a multinomial likelihood. The multinomial likelihood ... an effective sample size (ESS) that can be used as the nominal multinomial sample size. The method ... accounts for both the variation associated with sub-sampling of the random length frequency (LF) sample for ... ageing, and random reader error when ageing fish. The catch-at-age ESS is estimated by dividing the ESS ...
Meeting Document : WG-SAM-09/08 : Auteur(s): S.G. Candy (Australia)
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Preliminary analyses of data collected during experimental phases of the 1994/95 and 1995/96 Antarctic crab fishing seasons
Abstract: Data collected from the FN American Champion during Phases 1 and 2 of the experimental ... crab fishery were analyzed with generalized additive models and depletion estimators. Results from the ... generalized additive models show that the density of fishable P. spinosissima is highest off the northern ... coast of South Georgia and at depths between about 100 and 300 fathoms. The Phase 1 results suggest that ...
Meeting Document : WG-FSA-96/34 : Auteur(s): Watters, G.
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Aspects of the distribution and interannual variations in larval fish assemblages at South Georgia, Antarctica
Abstract: The Antarctic fish fauna is relatively impoverished with fewer than 300 species ... recorded from the whole Southern Ocean. Demersal forms predominate but many of these have extended early ... life histories as pelagic larval and juvenile phases. Only 30 larval stages of the 103 fish species ... occurring at South Georgia have been identified but these represent all of the dominant and economically ...
Meeting Document : WG-FSA-93/09 : Auteur(s): M.G. White (United Kingdom)
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Proposal for a SCOR Working Group to identify Ecosystem Essential Ocean Variables for measuring change in the biological properties of marine ecosystems
for measuring change in the biological properties of marine ecosystems” was developed by members of ... the Southern Ocean Observing System (SOOS) Science Steering Committee in conjuction with discussions ... amongst members of the Science Steering Committee of the IMBER program, Integrating Climate and Ecosystem ... Dynamics (ICED) as part of the development of the ICED Southern Ocean Sentinel. The aim of the Working ...
Meeting Document : WG-EMM-12/45 : Auteur(s): A. Constable (Australia)
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Revised research plan for the exploratory longline fishery for Dissostichus spp. in Division 58.4.2 in 2014/15
Abstract: Most things related to Dissostichus spp. in the eastern side of Antarctic has not been ... known well as namely the area is data poor areas. In the Division 58.4.1 there are two stocks; one ... extends from the SSRU 58.4.1C to the SSRU 58.4.2A, and the other one to the SSRU 58.4.1H. The population ... sizes were vulnerable with a big range of about 100-1,500 t per SSRU in 58.4.2. During the 2004-2014 ...
Meeting Document : WG-FSA-14/39 : Auteur(s): Delegation of the Republic of Korea