WG-FSA-00/1 Plus d'infos |
Provisional and Annotated Provisional Agenda for the 2000 Meeting of the Working Group on Fish Stock Assessment (WG FSA) |
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WG-FSA-00/10 Plus d'infos |
Research under way on New Zealand seabirds vulnerable to fisheries interactions J. Molloy (New Zealand) |
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WG-FSA-00/11 Plus d'infos |
Documentation for the CCAMLR survey database and length-density analysis Secretariat
Résumé:
Over the past two years, the CCAMLR Data Centre has undertaken a major overhaul of the research survey database and the routines used for length-density analyses. This overhaul was necessary because of the increasing quantity and diversity of survey data and their importance in the assessments of WG-FSA. Historically, trawl survey data and commercial trawl data were managed as a single dataset Read More
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WG-FSA-00/12 Plus d'infos |
Update on the CCAMLR Website Secretariat |
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WG-FSA-00/13 Plus d'infos |
Longline fishing at Tristan da Cunha: impact on seabirds N. Glass, I. Lavarello, J.P. Glass and P.G. Ryan (South Africa)
Résumé:
Tristan da Cunha and Gough Islands in the central South Atlantic Ocean support globally important seabird populations. Two longline fisheries occur within Tristan’s Exclusive Economic Zone: a pelagic fishery for tunas and a demersal fishery for bluefish and alfoncino. Fishery observers have accompanied all three licensed demersal cruises. Despite attracting considerable numbers of birds and Read More
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WG-FSA-00/14 Plus d'infos |
What do we know about fish stocks in the Southern Scotia region? A review and prospects for future research K.-H. Kock (Germany) and C. Jones (USA)
Résumé:
Work on finfish in the southern Scotia Arc was restricted to taxonomy until the end of the 1960’s. Commercial exploitation, primarily on mackerel ice fish, Champsocephalus gunnari, and marbled notothenia, Notothenia rossii, started around the South Orkney Islands (60 – 62° / 43 – 47° W) in 1977/78 and close to Elephant Island and the lower South Shetland Islands (60 – 62° S / 54 – 62° W) in Read More
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WG-FSA-00/15 Plus d'infos |
Preparation of identification keys for by-catch fish species Secretariat |
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WG-FSA-00/16 Plus d'infos |
Restoration of retrospective data on Dissostichus eleginoides catches in Subarea 48.3 Delegations of Ukraine and Russia |
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WG-FSA-00/17 Plus d'infos |
Brief report of national scientific observer aboard longliner RK1 Delegation of Ukraine |
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WG-FSA-00/18 Plus d'infos |
Summary of observations aboard trawlers operating in the Convention Area during the 1999/2000 season Secretariat |
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WG-FSA-00/19 Plus d'infos |
Hydroacoustic observations of the vertical distribution of icefish Champsocephalus gunnari in the western part of the slope of the South Georgia Island in December 1999–January 2000 V.L. Senioukov (Russia)
Résumé:
The dynamics of daily vertical migrations of icefish Champsocephalus gunnari was studied and some quantitative estimates were obtained by results of analysis of more than 150 fragments of echograms obtained with the use of an echograph of the "Priboi-101" echo sounder during the directed fishery for icefish in the subarea 48.3 in December 1999 – January 2000. The commercial concentrations of Read More
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WG-FSA-00/2 Plus d'infos |
List of participants |
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WG-FSA-00/20 Plus d'infos |
Biological features of the icefish Champsocephalus gunnari from commercial catches in Subarea 48.3 during the period from 8 December 1999 until 31 January 2000 V.L. Senioukov (Russia)
Résumé:
In the period from 11 December 1999 to 31 January 2000 Russian trawler "Zakhar Sorokin" carried out fishing the icefish Champsocephalus gunnari feeding consent rations in the western shelf of the South Georgia Island. Icefish 26-40 cm in length, with the average size of 30.3 cm made up the bulk of the catches. Length-frequency distribution was characterized by bimodality, with frequency peaks Read More
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WG-FSA-00/21 Plus d'infos |
UK groundfish survey in Subarea 48.3 (South Georgia and Shag Rocks), January 2000 I. Everson, D. Agnew, P. Bagley, M. Collins, T. Daw, R. Forster, T. Marlow, A. North (United Kingdom), J. Szlakowski (Poland), E. Van Wijk (Australia), S. Wilhelms (Germany) and C. Yau (United Kingdom)
Résumé:
A survey was conducted by the UK around South Georgia and Shag Rocks, Subarea 48.3, from 11 January to 2 February 2000, using the FV Argos Galicia. The design followed similar surveys by the UK conducted throughout the late 1980s and 1990s. The swept area estimates of the standing stock of Champsocephalus gunnari were about 24,800 t. Estimates for other major species are given.
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WG-FSA-00/22 Plus d'infos |
Notes on the biology of the South Georgia ray, Raja georgiana I. Everson, J. Kerr, C. Yau and A. Williams (United Kingdom)
Résumé:
Morphological information is given on specimens of Raja georgiana that were caught during a demersal trawl survey in Subarea 48.3, South Georgia. It is concluded that, in spite of allometric growth, proportional measurements are best referenced to total length rather than disc width. Additional biological information is given: total mass=0.00000646x(total length)3.06. Based on data from male Read More
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WG-FSA-00/23 Plus d'infos |
Fishing for toothfish using pots: results of trials undertaken around South Georgia, March–May 2000 D. Agnew, T. Daw, M. Purves and G. Pilling (United Kingdom)
Résumé:
During the period March to May 2000, the UK undertook trials of a pot fishing method to catch D. eleginoides around South Georgia (Sub-area 48.3). This method has the potential to minimise, or eliminate, incidental bird mortality when compared to the standard longline method. This paper describes the trial, the results, and discusses the commercial viability of this fishing method for Read More
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WG-FSA-00/24 Plus d'infos |
Crab by-catch in the experimental toothfish pot fishery around South Georgia, 2000 T. Daw, D. Agnew, M. Purves, G. Pilling and C. Yau (United Kingdom)
Résumé:
Trials of a method of fishing for toothfish using pots were undertaken by FV Argos Georgia from March to May 2000. A significant bycatch of crabs was encountered. Paralomis spinosissima occurred in shallow water, generally shallower than 800m. P. anamerae, which has not been reported for this area previously, had an intermediate depth distribution from 400 – 800m. P. formosa was present in Read More
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WG-FSA-00/25 Plus d'infos |
Examination of the gut contents of Patagonian toothfish (Dissostichus eleginoides) from the toothfish pot fishery trials around South Georgia G. Pilling, T. Daw, M. Purves, D. Agnew and J. Xavier (United Kingdom)
Résumé:
To undertake the 'ecosystem approach' to fisheries management recommended by CCAMLR, an understanding of the trophic relationships of exploited species is vital. Toothfish, (Dissostichus eleginoides), represents an important target species for fisheries not only in the study area around South Georgia (CCAMLR Sub-area 48.3), but also in other CCAMLR areas. To improve the knowledge on the Read More
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WG-FSA-00/26 Plus d'infos |
Toothfish tagging programme around South Georgia, 2000 G. Pilling, I. Everson, D. Agnew, T. Daw, R. Forster, A. North and M. Purves (United Kingdom)
Résumé:
A tagging programme for toothfish (Dissostichus eleginoides)w as undertaken around South Georgia during early 2000. Details of the programme are given. A total of 359 toothfish were tagged during a trawl survey on the Shag Rocks shelf and a further 135 were tagged on the continental slope around South Georgia and Shag Rocks. The programme has been advertised widely amongst industrial fishermen Read More
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WG-FSA-00/27 Plus d'infos |
Spawning activity of mackerel icefish at South Georgia I . Everson, A. North (United Kingdom) and K.-H. Kock (Germany)
Résumé:
Historical information is assessed on the distribution of spawning and larval mackerel icefish within subarea 48.3 (South Georgia). This is considered alongside other new data from commercial fisheries and research surveys. It is concluded that there is strong evidence for inshore spawning during April within and close to the bays on the north side of the island. Some spawning at much lower Read More
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WG-FSA-00/28 Plus d'infos |
A comparison between otoliths and scales for use in estimating the age of Dissostichus eleginoides from South Georgia J. Ashford, C. Jones, S. Wischniowski, S. Bobko (USA) and I. Everson (United Kingdom) |
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WG-FSA-00/29 Plus d'infos |
Reducing seabird by-catch with an underwater longline setting funnel P. Ryan and B. Watkins (South Africa)
Résumé:
We tested the efficacy of a Mustad underwater setting funnel to reduce seabird bycatch in a demersal longline fishery for Patagonian toothfish Dissostichus eleginoides. The funnel, which deploys the longline 1-2 m beneath the sea surface, was used on 52% of 1714 sets (total effort 5.12 million hooks) over a two-year period. There was no evidence for lower catches or significantly higher bait Read More
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WG-FSA-00/3 Plus d'infos |
List of documents |
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WG-FSA-00/30 Plus d'infos |
Seabird by-catch in the Patagonian toothfish longline fishery at the Prince Edward Islands: 1999–2000 P. Ryan and B. Watkins (South Africa)
Résumé:
This paper summarises seabird bycatch during the fourth year (July 1999-June 2000) of sanctioned longline fishing for Patagonian toothfish Dissostichus eleginoides in the Exclusive Economic Zone around South Africa's Prince Edward Islands. Data were obtained from fishery observers aboard all 11 sanctioned fishing trips. Fishing effort was 7.4 million hooks, a 45% increase on the number of Read More
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WG-FSA-00/31 Plus d'infos |
On possibility of using acoustic method to improve quality of Champsocephalus gunnari biomass estimates in Subarea 48.3 S. Kasatkina (Russia)
Résumé:
An attempt has been made to study icefish as an object of acoustic survey basing on the acoustic and biological data obtained by Russian RN ATLANTIDA in the area of South Georgia Island (January-February 2000). Estimation of possible target strength values was made by a comparison to TS of other fish species having similar body structure and morphological characters, as well as taking into Read More
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WG-FSA-00/32 Plus d'infos |
Length-age composition of icefish (Champsocephalus gunnari, perciformes, notothenioidei, Channichthyidae) from different locations of South Georgia Island subarea Zh.A. Frolkina (Russia)
Résumé:
Biostatistic data obtained by Soviet research and commercial vessels in 1970 to 1991 have been used to study length-age composition of Champsocephalus gunnari from different locations of South Georgia Island Subarea. An analysis of Ch.gunnari length-age groups spatial distribution over Eastern, Northern, Western, Southern Island Shelf and near Shag Rocks allowed for revealing similarity of Ch. Read More
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WG-FSA-00/33 Plus d'infos |
Standardised estimates of D. eleginoides catches per effort in Subarea 48.3 using information for 1985/86–1990/91 seasons P. Gasiukov (Russia) and V. Bibik (Ukraine)
Résumé:
A brief description of hawl-by-hawl data sets from Ukrainian commercial vessels fishing tooth-fish in Subdivision 48.3 during 1986-199 1 is presented. The fishery was mainly carried out in summer months off the eastern South Georgia and at Shag Rocks. The length frequency modes amounted to 95-100 cm, which exceeded modes for the latest years of fishery. Using the generalized additive model the Read More
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WG-FSA-00/34 Plus d'infos |
Global status of albatrosses and Macronectes and Procellaria petrels BirdLife International |
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WG-FSA-00/35 Plus d'infos |
Fishery dependent research
(Extract from the Report of New Zealand on Member’s Activities in the Convention Area in 1999/2000) |
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WG-FSA-00/36 Plus d'infos |
Fish Heaven: a Monte Carlo, spatially explicit single species fishery model for the testing of parameter estimation methods I. Ball and A. Constable (Australia)
Résumé:
Fish Heaven is a simple spatially explicit age structured fish model, containing the basic features of standard fish modeling with a number of optional extras. It was designed within an object oriented framework to allow for the possible extension in a number of directions. In particular it was designed with the view of testing the efficacy of different statistical sampling regimes given Read More
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WG-FSA-00/37 Plus d'infos |
A summary of observations on board longline vessels operating within the CCAMLR Convention Area Secretariat |
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WG-FSA-00/38 Plus d'infos |
A summary of observations on compliance with Conservation Measures 29/XVI and 63/XV Secretariat |
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WG-FSA-00/39 Plus d'infos |
Integration of CPUE data into assessments using the generalised yield model G. Kirkwood (United Kingdom) and A. Constable (Australia)
Résumé:
For the last 3 years, WG-FSA has accorded high priority to development of a method to integrate different indicators of stock status into assessments using the generalised yield model (GYM). In this paper, we propose a method, based on use of the sampling/importance-resampling algorithm, for incorporating information on trends in standardised CPUEs into GYM assessments. The use of the method Read More
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WG-FSA-00/4 Plus d'infos |
Data and resources available to WG-FSA 2000 Secretariat |
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WG-FSA-00/40 Plus d'infos |
A survey of fish stocks in the Heard Island and McDonald Islands region in the 1999/2000 season and a comparison of the abundances of selected species with those obtained in previous surveys R. Williams, A. Constable, T. Lamb and E. van Wijk (Australia)
Résumé:
A random stratified trawl survey was conducted in May 2000 to assess the abundance of icefish, Champsocephalus gunnari, and juvenile pre-recruit toothfish, Dissostichus eleginoides, on the Heard Island Plateau and Shell Bank. Abundances and length density plots of these species plus two principal bycatch species Lepidonotothen squamifrons and Channichthys rhinoceratus are given for each Read More
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WG-FSA-00/41 Plus d'infos |
A revision of yield and catch controls for managing the mackerel icefish (Champsocephalus gunnari) fishery in the vicinity of Heard Island and McDonald Islands A. Constable, R. Williams, T. Lamb and E. van Wijk (Australia)
Résumé:
A recent 2000 survey of mackerel icefish in the vicinity of Heard Island enabled a revised estimate of yield for the coming 2 seasons. While the biomass of icefish appears lower than in previous years, it is dominated by a strong age 2 year class. Estimates of yield for the Heard Island Plateau population using the short-term assessment are 1150 tonnes for 2000/01 and 1000 tonnes for 2001/02 Read More
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WG-FSA-00/42 Plus d'infos |
Update to recruitment series for Patagonian toothfish in the Heard Island region A. Constable, R. Williams, T. Lamb and E. van Wijk (Australia)
Résumé:
The recent fish survey at in the vicinity of Heard Island in 2000 has provided estimates of recruitment for at least one new cohort (1996) and another estimate of the 1995 cohort. The older cohorts are likely to be distributed more widely than the shallow part of the Heard Plateau, consistent with the observations from 1999. A reanalysis of all survey data from the region has shown that Read More
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WG-FSA-00/43 Plus d'infos |
An exact time of release and recapture stock assessment model applied to Macquarie Island Patagonian toothfish (Dissostichus eleginoides) G. Tuck, W. de la Mare, W. Hearn, R. Williams, A. Smith, X. He and A. Constable (Australia)
Résumé:
This paper presents an assessment of the harvested population of Patagonian toothfish at Macquarie Island based on data from a tag-recapture experiment initiated during the 1995/96 fishing season. Population models that include dynamics of tagged and un-tagged fish, daily releases, catches, recaptures, natural mortality, and annual net recruitment are used to assess the population of one of Read More
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WG-FSA-00/44 Plus d'infos |
Stock structure and growth in Patagonian toothfish (Dissostichus eleginoides) in the Southern Ocean J. Ashford, C. Jones (USA) and I. Everson (United Kingdom) |
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WG-FSA-00/45 Plus d'infos |
On the state of Champsocephalus gunnari stock in Subarea 48.3 and methods of its assessment K. Shust, V. Senioukov, P. Gasiukov and A. Kozlov (Russia)
Résumé:
The unusually effective fishery on mackerel icefish (C.gunnari) in the South Georgia Island subarea (48.3), when during 1.5 months two fishing vessels (Russia and Chile) caught more than 4 thousand tons, and the followed bottom trawl surveys by Russia and Great Britain in December 1999 - February 2000 showed clearly a necessity to revise the methods of icefish (which is near-bottom and pelagic Read More
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WG-FSA-00/46 Plus d'infos |
Results of D. eleginoides stock assessment for Subarea 48.3 using a dynamic age structured production model P. Gasiukov and R. Dorovskikh (Russia) |
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WG-FSA-00/47 Plus d'infos |
Brief information on the results of the bottom trawling survey at RV Atlantida in February 2000 in South Georgia subarea (48.3) P. Chernyshkov, P. Bukatin and V. Khvichya (Russia)
Résumé:
In February 2000 the bottom trawling survey was carried out in Subdivision of South Georgia (48.3) to assess the main commercial and promising near-bottom and bottom fish species. The data on distribution, biology, minimal (relative) biomass and abundance of fishes were obtained.
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WG-FSA-00/48 Rev. 1 Plus d'infos |
IUCN/CITES criteria for critically endangered, endangered and vulnerable species Secretariat |
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WG-FSA-00/49 Plus d'infos |
Australian research underway on seabirds vulnerable to fisheries interactions B. Baker and R. Gales (Australia) |
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WG-FSA-00/5 Plus d'infos |
Secretariat work in support of WG-FSA Secretariat |
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WG-FSA-00/50 Plus d'infos |
Information received from Norway on research related to the development of artificial bait and setting devices for longlines Secretariat |
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WG-FSA-00/51 Plus d'infos |
Distribution, biological characteristics and biomass of mackerel icefish based on the results of the trawling survey carried out at RV Atlantida in February 2000 Zh.A. Frolkina and P.S. Gasiukov (Russia)
Résumé:
The results of mackerel icefish (Champsocephalus gunnari) trawling survey carried out by Russia at R/V Atlantida in February 2000 in Subarea 48.3 are presented. During that period C.gunnari were feeding. In all parts of the Subarea, except the North-Western one, C. gunnari of 22-28 cm in length and 2-3 years old predominated. Fish biomass distributed near the bottom estimated with different Read More
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WG-FSA-00/52 Plus d'infos |
A method for estimating recruitment and mortality from time series of length-density data A. Constable and I. Ball (Australia)
Résumé:
Estimates of natural mortality are currently unavailable for Patagonian toothfish. Such estimates are needed for estimating recruitments and for use in assessing yield. This paper proposes a method for jointly estimating natural mortality and cohort strength at age 4 using a negative log-likelihood function based on one or more cohorts for which their abundance has been estimated in two or Read More
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WG-FSA-00/53 Plus d'infos |
Population genetics of Patagonian toothfish Dissostichus eleginoides and fillet identification of Patagonian toothfish and Antarctic toothfish D. mawsoni P. Smith and P. Gaffney (New Zealand) |
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WG-FSA-00/54 Plus d'infos |
New information on size at maturity of Dissostichus mawsoni in Subarea 88.1 G. Patchell (New Zealand) |
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WG-FSA-00/55 Plus d'infos |
The Ross Sea Antarctic toothfish (Dissostichus mawsoni) fishery from 1997/98 to 1999/2000 S. Hanchet and P. Horn (New Zealand) |
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WG-FSA-00/56 Plus d'infos |
Summary of seabird and marine mammal observations during observed toothfish (Dissostichus spp.) longline fishing operations in CCAMLR Subareas 88.1, 1998–2000 S. Baird (New Zealand) |
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WG-FSA-00/57 Plus d'infos |
Fishes collected during the 1999/00 exploratory fishery by New Zealand in CCAMLR Subarea 88.1 and registered in the National Fish Collection at the Museum of New Zealand Te Papa Tongarewa |
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WG-FSA-00/58 Plus d'infos |
Factors affecting the sink rate of autoline longline fishing gear R. Blackwell, B. Bull, S. Hanchet and N. Smith (New Zealand) |
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WG-FSA-00/59 Plus d'infos |
Examination of the skate by-catch from around South Georgia from one vessel in the 2000 longline toothfish season M. Endicott, D. Agnew and C. Nolan (United Kingdom)
Résumé:
Two previously recorded species, Raja georgiana and Bathyraja meridionalis were recorded as-bycatch on one vessel in the South Georgia toothfish fishery, 2000. One further species could not be identified and was referred to as R. species 1. R. georgiana occurred in shallow water, the other two in deep water. The average catch rate was 0.23 rajids/1000 hooks. Distribution and length at maturity Read More
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WG-FSA-00/6 Plus d'infos |
Fishery information for WG-FSA-00 Secretariat |
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WG-FSA-00/60 Plus d'infos |
Interactions between killer whales (Orcinus orca) and sperms whales (Physeter macrocephalus) with a longline fishing vessel C.P. Nolan, G.M. Liddle and J. Elliot (United Kingdom) |
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WG-FSA-00/61 Plus d'infos |
Review and evaluation of three mitigation measures – bird-scaring line, underwater setting and line shooter – to reduce seabird by catch in the Norwegian longline fishery S. Løkkeborg (Norway) |
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WG-FSA-00/62 Plus d'infos |
Feasibility of video monitoring seabird interactions on small domestic tuna longliners Delegation of New Zealand |
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WG-FSA-00/63 Plus d'infos |
Preliminary information on inshore demersal fish from the Danco Coast, Antarctic Peninsula, in the 1999/00 summer season R. Casaux, E. Barrera-Oro, A. Baroni and A. Ramón
Résumé:
A total of 1103 inshore notothenioid fish were caught by means of trammel-nets in four sites surrounding Cierva Point (Moss Island 1; Moss Island 2; Sterneck Island and Leopardo Island), Danco Coast, West Antarctic Peninsula, in the summer season of 2000. The families Nototheniidae, Channichthyidae and Bathydraconidae were represented being Notothenia coriiceps the dominant fish of the area. Read More
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WG-FSA-00/64 Plus d'infos |
Performance assessment and performance improvement of two underwater line setting devices for avoidance of seabird interactions in pelagic longline fisheries N. Brothers, D. Chaffey and T. Reid (Australia) |
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WG-FSA-00/7 Plus d'infos |
United Kingdom genetic research relevant to Southern Ocean seabirds vulnerable to fisheries interactions J.P. Croxall (United Kingdom) |
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WG-FSA-00/8 Plus d'infos |
United Kingdom research under way on Southern Ocean seabirds vulnerable to fisheries interactions J.P. Croxall (United Kingdom) |
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WG-FSA-00/9 Plus d'infos |
France research under way on Southern Ocean seabirds vulnerable to fisheries interactions H. Weimerskirch (France) |
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