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LENGTH AND AGE AT SPAWNING OF ANTARCTIC TOOTHFISH DISSOSTICHUS MAWSONI IN THE ROSS SEA
Abstract: This study uses a histological assessment of age and length at spawning for female and ... spawn in a given year and is therefore appropriate to evaluate spawning stock biomass relative to stock ... management decision rules. A characterisation of the oocyte developmental cycle of Antarctic toothfish shows ... cortical alveoli stage at least a year prior to spawning. Individual oocytes are then recruited into the ...
Meeting Document : WG-FSA-09/37 : Автор(ы): S.J. Parker and P.J. Grimes (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 ... requires a nominal sample size for each fishery and year combination. A method is described for estimating ... Monte Carlo multinomial replicates of the observed age length key (ALK) with each ALK used to generate a ... replicate age frequency sample. For each replicate a random draw of the ageing error matrix is taken and ...
Meeting Document : WG-SAM-09/08 : Автор(ы): S.G. Candy (Australia)
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Development of methods for evaluating the management of benthic impacts from longline fishing using spatially explicit production models, including model validation
vulnerable marine ecosystems (VMEs). We describe a spatially explicit production model that can be used to ... investigate a range of scenarios for simulating the effect and management of benthic impacts from longline ... fishing effort. Further, we update this paper with a set of simulations using a range of simple and ... carried out under a range of productivity assumptions, impact, and spatial scale, with and without ...
Meeting Document : WG-FSA-10/29 : Автор(ы): A. Dunn, S.J. Parker and S. Mormede (New Zealand)
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Bridging the krill divide: understanding cross-sector objectives for krill fishing and conservation
Abstract: In June 2014, the ICED programme, the British Antarctic Survey and WWF co-hosted a two ... . This included shared commitment to maintaining a healthy ecosystem and support for management of the ... agreed that current levels of fishing have a low risk of significant impacts but that there is no need to ... increase catch limits. Participants also agreed that the objectives of management must include a healthy ...
Meeting Document : SC-CAMLR-XXXIII/BG/34 : Автор(ы): United Kingdom, Norway, Chile, ASOC and ARK
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Simulating nursery areas for Antarctic krill along the western Antarctic Peninsula with relevance for the Domain 1 MPA Planning process
Abstract: Antarctic krill (Euphausia superba) is a key species and a dominant grazer in the ... that conditions a successful completion of the cycle. The objective of the present study is to estimate ... along the western Antarctic Peninsula (WAP) shelf. This objective was addressed using a one-dimensional ... with temperature and density fields from a high-resolution model scaled by projections for 2030 for the ...
Meeting Document : SC-CAMLR-XXXVI/BG/12 : Автор(ы): Delegations of Argentina and Chile
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Trophic study of Ross Sea Antarctic toothfish (Dissostichus mawsoni) using carbon and nitrogen stable isotopes
indicate that, very generally, larger fish consume prey of a higher trophic level than smaller fish. There ... were substantial residual within-species variations in δ15N and δ13C. Dissostichus mawsoni exhibited a ... rostrata (2.7 ‰ range) showed a d15N range greater than 3.4 ‰ spanning more than one trophic step. This ... implies that the diet of all species sampled was variable, or that individual species were eating a ...
Meeting Document : WG-EMM-08/27 : Автор(ы): S.J. Bury, M.H. Pinkerton, D.R. Thompson, S. Hanchet, J. Brown and I. Vorster (New Zealand)
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Surface water masses, primary production, krill distribution and predator foraging in the vicinity of Elephant Island during the 1989-90 austral summer
Abstract: Four successive surveys of the pelagic marine environment were conducted over a 100-by ... predators. A hydrographic front, north of Elephant Island and aligned southwest-to-northeast, persisted ... of it. A second front was apparent at the eastern side of the study area and was tentatively ... mature and exhibited a general transition from reproductively active to gravid and spent individuals. A ...
Meeting Document : WG-CEMP-90/11 : Автор(ы): A.F. Amos, J.L. Bengtson, O. Holm-Hansen, V.J. Loeb, M.C. Macaulay and J.H. Wormuth (USA)
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The use of predator-derived krill length-frequency distributions to calculate krill target strength
ecosystem based approach to resource management. We propose a method using krill sampled from the diet of ... predators to provide a length-frequency distribution of krill at times when it is possible to run automated ... operations. This will allow a robust estimate of krill abundance to be estimated from acoustic data. Changes ... in the length-frequency distribution of krill over a period of few weeks produced a 10 % difference ...
Meeting Document : WG-EMM-00/42 : Автор(ы): K. Reid and A.S. Brierley (United Kingdom)
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REPORT ON THE ABANDONED GILLNET RETRIEVAL OPERATION CONDUCTED BY AUSTRALIA IN CCAMLR STATISTICAL DIVISION 58.4.3B (BANZARE BANK)
gillnets as a fishing method to target toothfish in the Convention area. Estimating the impact of IUU ... fishing is hampered by a lack of data on the design, deployment, catch and bycatch rates of gill nets ... . This paper describes a gillnet found abandoned by Australian vessel patrolling BANZARE Bank ... (Statistical Division 58.4.3b), and the toothfish and bycatch found when a section of the gillnet was retrieved ...
Meeting Document : TASO-09/10 : Автор(ы): Snowdon, D., Hamill, J., McEachan, F., Welsford, D.
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Estimation of krill (Euphausia superba) mortality and production rate in the Antarctic peninsula region
Abstract: A net sampling survey for krill was carried out by RV ‘Meteor’ along the Antarctic ... exceeded a factor of 35 times, while interannual variability between available surveys reached only a ... factor of 1.6 times. Krill mortality was calculated by linearized catch curve analysis and resulted a ... rate of Z=0.88 (1989/90) and Z=0.96 (1987/88). Production was estimated and resulted a P/B ratio of ...
Meeting Document : WG-KRILL-91/15 : Автор(ы): Delegation of Germany
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