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1. Data from recent trawl surveys in the vicinity of Heard Island and McDonald Islands (Division 58.5.2), reveal an unusual cohort structure in the mackerel icefish (Champsocephalus gunnari) population

   the 2011/2012 CCAMLR season. This paper provides a preliminary assessment of yield for the area of ... Abstract:  Surveys of mackerel icefish, Champsocephalus gunnari, was undertaken in Division 58.5.2 ... in the vicinity of Heard Island during September 2010 and April 2011, to provide information on the ... population dynamics of this species, and to provide a basis for an assessment of short-term annual yield in ...

   Meeting Document : WG-FSA-11/22 : Autor(es): D.C. Welsford (Australia)

2. Results from the random stratified trawl surveys to estimate distribution and abundance of Dissostichus eleginoides and Champsocephalus gunnari in the Heard Island region (Division 58.5.2) for 2010 and 2011

   2011 on the RV Southern Champion, adding to the time series of annual surveys in Division 58.5.2 that ... information on abundance. Catches of D. eleginoides were at half or lower than in surveys from both years than ... the average catch for the previous four years (2006-2009).  Catches of C. gunnari were very low, with ... the 2011 catch, at less than 0.5 t, 15% of the earlier four year average, and the 2010 catch being 60 ...

   Meeting Document : WG-FSA-11/23 : Autor(es): G.B. Nowara, S.G. Candy and T. Lamb (Australia)

3. DEPREDATION AROUND SOUTH GEORGIA AND THE IMPLICATIONS ON STOCK ASSESSMENT OF D. ELEGINOIDES

   levels of depredation caused by killer whales (Orcinus orca) and sperm whales (Physeter macrocaphalus ... ) around South Georgia. Since 2003 cetaceans have been observed on 3000 out of 14644 observed lines (20.5 ... examined and varied from 0.9% to 5.8% of the TAC per year over the time period. Additional work was also ... conducted which looked at the behaviour of cetaceans around fishing vessels in the area. To aid ...

   Meeting Document : WG-FSA-09/16 : Autor(es): J. Moir Clark, D.A. Agnew, P. McCarthy and M. Unwin (United Kingdom)

4. ACCURACY OF BENTHIC INVERTEBRATE BY-­CATCH IDENTIFICATION BY OBSERVERS OPERATING IN THE HEARD ISLAND AND MCDONALD ISLANDS PATAGONIAN TOOTHFISH LONGLINE FISHERY

   Abstract:  As a means of testing the accuracy of observer identifications and to provide ... Antarctic Division (AAD). Observers displayed a high level of accuracy (89%) in the identification of ... longline invertebrate by-catch. Common taxonomic errors included the misclassification of stylasterids ... training in the classification of cnidarians (stony corals, soft corals and stylasterids) and coral-like ...

   Meeting Document : WG-FSA-09/23 : Autor(es): T. Hibberd (Australia)

5. ANTARCTIC TOOTHFISH STOCK ASSESSMENT IN DIVISION 58.4.1 ON THE BASIS OF CPUE DATA

   Abstract:  An attempt to use CPUE data based on data of erussian observers in the assessment of ... division (e.g. WG-SAM-08/4), the assessment was intended to be independent of estimates of toothfich stock ... biomass in the Ross Sea. As a result of implementation of a dynamic production model, current biomass in ... this division is estimated as about 15000 t, while the estimate of virgin biomass B0 is found to be ...

   Meeting Document : WG-SAM-09/12 : Autor(es): D. Vasilyev, K. Shust, V. Tatarnikov, I. Istomin and A. Petrov (Russia)

6. USING GENERALIZED DISSIMILARITY MODELLING TO ANALYSE AND PREDICT PATTERNS OF BETA DIVERSITY IN REGIONAL BIODIVERSITY ASSESSMENT

   predicting spatial patterns of turnover in community composition (beta diversity) across large regions. The ... approach is an extension of matrix regression, designed specifically to accommodate two types of ... ) the variation in the rate of compositional turnover at different positions along environmental ... gradients. GDM can be further adapted to accommodate special types of biological and environmental data ...

   Meeting Document : WS-VME-09/P03 : Autor(es): Richardson, K., Manion, G., Ferrier, S., Elith, J.

7. Community Structure of copepods in epipelagic layers in the Ross Sea and neighboring waters

   Abstract:  During the 9th research cruise of the R/V Kaiyo-maru, copepod samples were collected ... groups by cluster analysis based on species abundance and composition. Group 1 located in the north of ... the Southern Boundary of the Antarctic Circumpolar Current was characterized by high abundance (157.5 ... -2279.5; mean 610.5 inds. 1000 m-3) and dominance of Rhincalanus gigas (mean 88.4%). Group 2 located off ...

   Meeting Document : WG-EMM-08/36 : Autor(es): Y. Watanabe, S. Sawamoto, T. Ishimaru and M. Naganobu (Japan)

8. UPDATE ON ITEMS OF INTEREST TO WG-IMAF

   (Convention seabirds) is detailed. This paper includes a tabulation of observed captures by species and ... bycatch estimations by fishery for all seabirds. This paper also contains description of the recent and ... Economic Zone that are relevant to the work of WG-IMAF. These developments include refinement of the ... requirement of fishing practices to reduce seabird bycatch by surface longline vessels and the introduction of ...

   Meeting Document : WG-FSA-08/47 : Autor(es): N. Walker (New Zealand)

9. Interannual variation in the diet of the Antarctic prion Pachyptila desolata at South Georgia

   Abstract:  The diet of the Antarctic Prion Pachyptila desolata was examined using food samples ... was mainly crustaceans, with a small proportion of myctophid fish and trace amounts of cephalopods ... copepods, especially Rhincalanus gigas and Calanoides acutus, in two years of low krill abundance ... . Differences in the prey species taken and observations of foraging behaviour suggest that in years of low ...

   Meeting Document : WG-EMM-97/12 : Autor(es): Croxall, J.P., Edwards, T.M., Reid, K.

10. Conditions for the precise measurement of fish target strength in situ

    Abstract:  Conditions for precise measurement of in situ fish target strength (TS) are empirically ... studied and two indexes are introduced for this purpose. One is the number of fish in the effective ... reverberation volume which contributes echo formation at a certain instant and the other is the percentage of ... the multiple echoes which is derived from a residual of the single echo extraction. With the decrease ...

    Meeting Document : WG-Krill-94/35 : Autor(es): K. Sawada and M. Furusawa (Japan), N.J. Williamson (USA)

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