WG-FSA-06/06 Plus d'infos |
Report of the WG-FSA Subgroup on Assessment Methods(Walvis Bay, Namibia, 10 to 14 July 2006) |
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WG-FSA-06/1 Plus d'infos |
Provisional Agenda and Provisional Annotated Agenda for the 2006 Meeting of the Working Group on Fish Stock Assessment (WG FSA) |
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WG-FSA-06/10 Plus d'infos |
Species composition of fish from Antarctic toothfish Dissostichus mawsoni stomachs of the Ross Sea A.V. Balushkin (Russia) and V.G. Prutko (Ukraine)
Résumé:
Data on Antarctic toothfish stomach contents were collected from Subarea 88.1 on board of the longliner “Yantar” under Russian flag in the 2005/06 season. The results of researches demonstrated that the main toothfish food in the Ross Sea were not cephalopods, but bottom and demersal fishes, Macrourus whitsoni in particular. The list of 25 fish species of 14 families is given.
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WG-FSA-06/11 Rev. 2 Plus d'infos |
Estimation of IUU catches in the Convention Area in the 2005/06 fishing season Secretariat
Résumé:
The paper presents an estimate of IUU catches of toothfish during the 2005/06 fishing season, using the standard methodology.
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WG-FSA-06/12 Plus d'infos |
Comparison of census methods for black-browed albatrosses breeding at the Ildefonso Archipelago, Chile G. Robertson, K. Lawton (Australia), C.A. Moreno (Chile), R. Kirkwood (Australia) and J. Valencia (Chile)
Résumé:
Although a breeding population of black-browed albatrosses has been known to exist at the Ildefonso Archipelago, Chile, for > 90 years the population has never been censused using scientifically defendable methods. To estimate population size, and examine the accuracy and practicality of various census methods, the population was censused in the 2002/03 breeding season using a) ground- Read More
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WG-FSA-06/13 Plus d'infos |
Brief report on scientific observation on the fishery vessel Mellas (FAO Statistical Area 41, January to July 2006) S. Usachev (Ukraine)
Résumé:
Materials on results of scientific observation in fishery cruise on the longliner “Mellas”, operating under the Ukrainian flag in FAO statistical area 41 in the southwest Atlantic outside exclusive (sea) economic zones of the foreign states at Patagonian toothfish (Dissostichus eleginoides) fisheries are submitted. The data on volume of the biological material collected in the cruise, the data Read More
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WG-FSA-06/14 Plus d'infos |
Standing stock, spatial distribution and biological features of demersal finfish from the 2006 US AMLR bottom trawl survey of the northern Antarctic Peninsula and Joinville–D’Urville Islands (Subarea 48.1) C.D. Jones (USA) and K.-H. Kock (Germany)
Résumé:
During February-March 2006, the United Station Antarctic Marine Living Resources (U.S. AMLR) Program in collaboration with the German Federal Research Centre for Fisheries conducted a bottom trawl survey of the northern Antarctic Peninsula (southern Bransfield Strait) and Joinville/D’Urville Islands. This area included the likely historical fishing grounds of a trawl fishery for the spiny Read More
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WG-FSA-06/15 Plus d'infos |
Report of new longline system in the exploratory fisheries for Dissostichus spp. in 2005/06 Delegation of Japan
Résumé:
This document reports that how new bottom long line system instead of Spanish long line system was applied to exploratory long line fisheries for Dissostichus spp. in 2005/06 season, indicating distinctive points on fishing gear, line setting and line hauling process, and explaining the reason why there was no seabirds caught at line setting and line hauling either.
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WG-FSA-06/17 Plus d'infos |
The results of investigations of the feeding of Antarctic toothfish D. mawsoni in the Ross Sea in 2005/06 A.F. Petrov (Russia)
Résumé:
The works on study of the diet composition of Antarctic toothfish were conducted from December to March during the two fishery seasons (2004-2005 and 2005-2006) in different fishing areas of the Ross Sea located between 67°S to 76°S. 192 longline settings were made. In total, over two seasons 3000 stomachs (1913 stomachs in 2005 and 1087 ones in 2006) were analyzed. In 2005 fish was caught at Read More
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WG-FSA-06/18 Plus d'infos |
Notes on the Second Meeting of the WCPFC – Ecosystem and Bycatch Specialist Working Group, Manila, 10 August 2006 C. Small (BirdLife International)
Résumé:
Report from the second meeting of the WCPFC Ecosystem and Bycatch Specialist Working Group 2006, with background on draft seabird recommendations
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WG-FSA-06/19 Plus d'infos |
Distribution of albatrosses and petrels in the WCPFC Convention Area and overlap with WCPFC longline fishing effort C. Small (BirdLife International)
Résumé:
This paper presents an analysis of the distribution of albatrosses and petrels in the area under the jurisdiction of the Western and Central Pacific Fisheries Commission (WCPFC), using data from the BirdLife Global Procellariiform Tracking Database.
• The WCPFC area includes 41% of the global breeding distribution of albatrosses and petrels.
• Albatross distribution is concentrated Read More
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WG-FSA-06/2 Plus d'infos |
List of participants |
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WG-FSA-06/20 Plus d'infos |
Saga Sea krill harvesting and production T. Williksen (Norway)
Résumé:
F/T Saga Sea is a Norwegian registered factory trawler owned by the Aker Seafoods Antarctic AS, and is licensed to fish krill in Area 48.1-4. Aker has developed a patented new environmental friendly continuous trawling system, named Aker Eco Harvesting System. The system is described in the paper and is based on a conventional trawl with a connected rubber hose to the cod end of the trawl. The Read More
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WG-FSA-06/21 Plus d'infos |
Recommended changes to Conservation Measure 25-02 pertaining to the Spanish system of longline fishing G. Robertson (Australia) and C. Moreno (Chile) |
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WG-FSA-06/22 Plus d'infos |
Best practice seabird by-catch mitigation for Spanish-rig longline vessels with emphasis on line weighting regimes G. Robertson (Australia), C.A. Moreno (Chile), B. Wienecke (Australia), P. Gandini (Argentina), G. McPherson (Australia) and J.-P. Seco Pon (Argentina)
Résumé:
The Spanish system is used in a range of demersal and semi-pelagic longline fisheries throughout the southern hemisphere and has been the source of a large number of seabird fatalities. An experiment was conducted on a chartered Spanish-rig vessel to improve the sink rate of longlines to reduce interactions with seabirds. The benchmark sink rate was that of integrated weight (IW) longlines, as Read More
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WG-FSA-06/23 Plus d'infos |
On possible impact of new continuous krill fishing technology on juvenile fish and larvae S.M. Kasatkina
Résumé:
The new continuous krill fishing system uses both a small-meshed midwater trawl and a powerful pumping system for continuous pumping the catch out of the trawl bag. It was discussed the potential threats of new technology to Antarctic marine ecosystem. It was shown that application of this fishing technology may result in considerable by-catch of the juvenile fish and larvae in krill fishery Read More
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WG-FSA-06/24 Plus d'infos |
Mercury concentrations in Patagonian toothfish, Dissostichus eleginoides Smitt 1898, among three distinct ocean basins K. Dawson Guynn and M.S. Peterson (USA)
Résumé:
Patagonian toothfish, Dissostichus eleginoides, collections (n-186) from three ocean basins were analysed for Hg concentration and comparisons were made by gender, total length (TL), wet weight (WW), and basin. There was no difference between TL-WW relationships by gender within any basin across the range examined. However, fish were significantly smaller within the Atlantic basin (mean=84.52 Read More
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WG-FSA-06/25 Plus d'infos |
Information on the status of fjord Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps in
the lower South Shetland Islands derived from a long-term monitoring program (1983–2006) at Potter Cover E.R. Barrera-Oro and E.R. Marschoff (Argentina)
Résumé:
The long term monitoring program of demersal fish at inshore sites of the South Shetland Islands has continued at Potter Cove from 2000 to 2006, covering a continuous sampling period of twenty four years, and at Harmony Cove, Nelson Island, in the austral summers from 2001 to 2003. The decline in trammel net catches of fjord fishes of the species Notothenia rossii and Gobionotothen Read More
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WG-FSA-06/26 Plus d'infos |
Species profile for Antarctic toothfish (Dissostichus mawsoni) S.M. Hanchet (New Zealand)
Résumé:
A toothfish species profile, covering aspects of the biology, fisheries and stock assessment of both toothfish species was completed by Everson (2002). Aspects of the biology of D. mawsoni were summarised by Hanchet et al. (2003), whilst more recent research has been reported in background documents to WG-FSA. The aim of the current work was to collate and summarise existing biological data on Read More
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WG-FSA-06/27 Plus d'infos |
Stomach contents of sub-adult Antarctic toothfish (Dissostichus mawsoni) from the western Ross Sea, Antarctica D.W. Stevens (New Zealand)
Résumé:
The stomach contents of 190 sub-adult (51-100 cm TL) Antarctic toothfish (Dissostichus mawsoni) captured by bottom longline in the western Ross Sea were analysed. Fish were sampled during the 2005 fishing (Dec 2004 to Jun 2005) season and caught in 398-1678 m depths. Sub-adult D. mawsoni are primarily piscivorous, feeding on a wide variety of small to medium sized fish. Icefish ( Read More
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WG-FSA-06/28 Plus d'infos |
Preliminary analyses of an ectoparasite Eubrachiella antarctica as a marker for stock discrimination of Antarctic toothfish in the Ross Sea P.J. Smith, A. McKenzie and L. Tubbs (New Zealand)
Résumé:
This project evaluated the prevalence and intensity of an ectoparasite Eubrachiella antarctica as a marker for stock discrimination of Antarctic toothfish in the Ross Sea. New Zealand Ministry of Fisheries Observers on four toothfish longline vessels recorded the number of E. antarctica on the fins and in the buccal cavity of 621 large D. mawsoni (mostly 120-150 cm). Up to five D. mawsoni per Read More
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WG-FSA-06/29 Plus d'infos |
A characterisation of the toothfish fishery in Subareas 88.1 and 88.2 from 1997/98 to 2005/06 S.M. Hanchet, M.L. Stevenson and A. Dunn (New Zealand)
Résumé:
The exploratory fishery for Antarctic toothfish (D. mawsoni) has been operating for nine years in Subarea 88.1 and for five years in Subarea 88.2 with a large amount of data collected on toothfish and the associated bycatch. All SSRUs in the two subareas except for 881D and 882C have now been fished. The 2006 D. mawsoni catch was the second highest on record with a total of 3388 t against a Read More
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WG-FSA-06/3 Plus d'infos |
List of documents |
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WG-FSA-06/30 Plus d'infos |
Towards a seabird mortality risk assessment: distribution of seabirds in the WCPFC Convention Area and potential overlap with fisheries S. Waugh (New Zealand)
Résumé:
This paper reviews the distribution of seabird species with the WCPFC Area. From a review of the distributions of 99 species of albatross and petrel, 16 species of albatross and 60 species of petrel occur within the area of the WCPFC, and are potentially vulnerable to fisheries bycatch. These include species with IUCN classification of Critically Endangered (n = 1), Endangered (n = 7), Read More
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WG-FSA-06/31 Plus d'infos |
Review of biological parameters for Ross Sea skates M.P. Francis (New Zealand)
Résumé:
Biological parameters were reviewed and updated for the two main species of skates taken as bycatch in the Ross Sea toothfish fishery: Amblyraja georgiana and Bathyraja cf. eatonii. Differences in length-weight relationships among regions raise doubt about the conspecificity of A. georgiana from the Ross Sea and South Georgia, and of B. cf. eatonii from the Ross Sea and Heard Island and the Read More
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WG-FSA-06/32 Plus d'infos |
Summary of Ross Sea skate tagging programme results S.L. Ballara, A. Dunn and M.P. Francis (New Zealand)
Résumé:
Over 9,000 skates have been tagged and released in the Ross Sea over a period of seven years, and 47 (0.5%) have been recaptured. The recapture of tagged Amblyraja georgiana after up to four years at liberty shows that some skates survive and recover from being hauled out of depths of around 1,000 m and tagged. In-water tagging greatly reduces the incidence of broken jaws in skates, and Read More
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WG-FSA-06/33 Plus d'infos |
Some thoughts on the CCAMLR risk assessment for seabird–fishery interactions S. Waugh (New Zealand)
Résumé:
The CCAMLR system for assessing risk of fisheries mortalities to seabirds has been applied for 10 years and helps to define mitigation and monitoring requirements for fisheries within the waters of the CCAMLR convention area. Annual review of the information by used CCAMLR Working Group on Incidental Mortality Associated with Fishing for the assessments of risk, and performance of fisheries Read More
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WG-FSA-06/34 Plus d'infos |
An updated descriptive analysis of the toothfish (Dissostichus spp.) tagging programme in Subareas 88.1 and 88.2 up to 2005/06 A. Dunn and S.M. Hanchet (New Zealand)
Résumé:
A descriptive analysis of the toothfish tagging programme carried out in Subareas 88.1 and 88.2 since 2001 is presented. The paper updates and revises tag-release and tag-recapture data which were presented in July 2006 at WG-FSA-SAM. In addition, the paper presents release and recapture data for non-New Zealand vessels for the 2005-06 season for the first time. However, tag data were still Read More
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WG-FSA-06/35 Plus d'infos |
Estimating fishing gear selectivity for trawlers using length-frequency data from concurrent commercial trawl and longline fishing for Patagonian toothfish in Division 58.5.2 and the ratio of their hazard functions S.G. Candy (Australia)
Résumé:
The upper-arm of the length-dependent fishing selectivity function for trawlers fishing for Patagonian toothfish around Heard Island (Division 58.5.2) was modelled as the exponential of a quadratic function in length. This function was calibrated using random length frequency (LF) data collected from commercial operations of each of trawlers and longliners fishing concurrently for 3 seasons Read More
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WG-FSA-06/36 Rev. 2 Plus d'infos |
A summary of observations on board longline vessels operating within the CCAMLR Convention Area during the 2005/06 season Secretariat |
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WG-FSA-06/37 Rev. 1 Plus d'infos |
Summary of observations aboard trawlers operating in the Convention Area during the 2005/06 season Secretariat |
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WG-FSA-06/38 Plus d'infos |
A summary of scientific observations related to Conservation Measures 25-01 (1996), 25-02 (2005), and 25-03 (2003) Secretariat |
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WG-FSA-06/39 Rev. 1 Plus d'infos |
Summary of an observation aboard a pot vessel operating in the Convention Area during the 2005/06 season Secretariat |
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WG-FSA-06/4 Plus d'infos |
CCAMLR fisheries: 2006 update Secretariat
Résumé:
Information on CCAMLR fisheries of relevance to the work of WG-FSA is summarised, and where possible, in a format suitable for importing directly to the Fishery Reports. Additional fishery-related information can be found in WG-FSA-06/36, 06/37, 06/38 (summaries of observer data), SC-CAMLR-XXV/BG/1 rev.1 (catches in the Convention Area) CCAMLR-XXV/16 (summary of notification for new and Read More
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WG-FSA-06/40 Plus d'infos |
Report of ACAP Working Group on Status and Trends
Agreement on the Conservation of Albatrosses and Petrels – Status and Trends Working Group
Résumé:
1. The first Session of the Meeting of the Parties (MOP1) of the Agreement on the Conservation of Albatrosses and Petrels (ACAP) agreed to review the population status, trends and demography of albatrosses (21 species) and petrels (seven species) listed on Annex 1 of the Agreement (MOP1 Final Report, Paragraph 7.2).
2. To progress this review, ACAP’s Advisory Committee established a Read More
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WG-FSA-06/41 Plus d'infos |
Interactions between seabirds and deep water hake trawl gear:
an assessment of impacts in South African waters 2004/05 B.P. Watkins, S.L. Petersen and P.G. Ryan (South Africa)
Résumé:
This study estimates the mortality of seabirds in the South African deep water hake trawl fishery. Observations of interactions between seabirds and trawl gear were made on 331 trawls during 20 trips on 14 vessels between mid-2004 and end 2005. Long-winged albatrosses were killed most frequently, with Shy Albatrosses comprising 43% and Black-browed Albatrosses 37% of birds killed. Small Read More
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WG-FSA-06/42 Rev. 1 Plus d'infos |
Report on a random stratified trawl survey to estimate distribution and abundance of Dissostichus eleginoides and Champsocephalus gunnari conducted in the Heard Island region (Division 58.5.2), May–June 2006 G.B. Nowara, R. Williams and T. Lamb (Australia)
Résumé:
Random stratified trawl surveys (RSTSs) of the distribution and abundance of demersal fish species on the Heard Island plateau have been conducted annually since 1997. The survey conducted in May-June 2006 had two main aims:
• to assess the abundance and size structure of juvenile and adult Dissostichus eleginoides on the shallow and deep parts of the Heard Island Plateau. ]
• to Read More
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WG-FSA-06/43 Rev. 1 Plus d'infos |
Preliminary assessment of mackerel icefish, Champsocephalus gunnari, in the vicinity of Heard Island and McDonald Islands (Division 58.5.2), based on a survey in May–June 2006 using the Generalised Yield Model D.C. Welsford (Australia)
Résumé:
A survey of mackerel icefish, Champsocephalus gunnari, was undertaken in Division 58.5.2 in the vicinity of Heard Island in May-June 2006 to provide the information for an assessment of short-term annual yield in the 2006/2007 CCAMLR season. This paper provides a preliminary assessment of yield for the area of Division 58.5.2 to the west of 79°20’ E using standard CCAMLR methods. A lack of Read More
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WG-FSA-06/44 Rev. 1 Plus d'infos |
Review of the use of survey data and length-at-age models in the assessment of Dissostichus eleginoides in the vicinity of Heard Island and McDonald Islands (Division 58.5.2) D.C. Welsford, A.J. Constable and G.B. Nowara (Australia)
Résumé:
This paper reviews the allocation of historical survey data to the new strata and the implications of this review to estimating the abundance of juvenile fish using CMIX. In addition, the paper examines how the latest length-at-age model for Dissostichus eleginoides (Patagonian toothfish) in 58.5.2 could affect the estimates of juvenile abundance. Model estimates were best incorporating the Read More
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WG-FSA-06/45 Rev. 1 Plus d'infos |
Preliminary assessment of Patagonian toothfish, Dissostichus eleginoides, in the vicinity of Heard Island and McDonald Islands (Division 58.5.2), based on a survey in May–June 2006 using the Generalised Yield Model D.C. Welsford, A.J. Constable, T. Lamb and T. Robertson (Australia)
Résumé:
A survey of Patagonian toothfish, Dissostichus eleginoides, was undertaken in Division 58.5.2 in the vicinity of Heard Island in May-June 2006 to provide the information for an assessment of short-term annual yield in the 2006/2007 CCAMLR season. This paper provides a preliminary assessment of yield for the area of Division 58.5.2 to the west of 79°20’ E using standard CCAMLR methods. It also Read More
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WG-FSA-06/46 Plus d'infos |
A proposal to adopt a conservation measure seeking an interim prohibiting on deep sea gillnet fishing in the Convention Area Delegation of Australia
Résumé:
Australia proposes that the possession and/or use of gillnets for commercial purposes be prohibited until such time as (1) the Scientific Committee has investigated and reported on the potential impacts of this gear in the Convention Area, and (2) the Commission has agreed on the basis of advice from the Scientific Committee that such a method may be used in the Convention Area.
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WG-FSA-06/47 Plus d'infos |
Standardised CPUE analysis of the Antarctic toothfish (Dissostichus mawsoni) fishery in the Ross Sea for the years 1997/98 to 2005/06 A. Dunn and S.M. Hanchet (New Zealand)
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