Résultats de la recherche
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POPULATION ASSESSMENTS OF GENTOO PENGUINS (PYGOSCELIS PAPUA) BREEDING AT AN IMPORTANT ANTARCTIC TOURIST SITE, GOUDIER ISLAND, PORT LOCKROY, PALMER ARCHIPELAGO, ANTARCTICA
six visited colonies, two showed an important and significant statistical decline in the number of ... (chicks per nest) of the 10 colonies on Goudier Island, all of which have now been monitored for 12 ... considerable inter-annual variability for both the number of breeding pairs and breeding productivity. Of the ... breeding pairs. One of these declining colonies is used to determine the breeding chronology dates for all ...
Meeting Document : WG-EMM-09/P07 : Auteur(s): P.N. Trathan, J. Forcada, R. Atkinson, R.H. Downie and J.R. Shears
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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
population dynamics of this species, and to provide a basis for an assessment of short-term annual yield in ... population, leading to a situation that is unusual for this region, with four or five successive year classes ... the 2011/2012 CCAMLR season. This paper provides a preliminary assessment of yield for the area of ... Division 58.5.2 to the west of 79o 20’ E using standard CCAMLR methods. A predicted in 2010, the strong 4 ...
Meeting Document : WG-FSA-11/22 : Auteur(s): D.C. Welsford (Australia)
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Stratification of catch-at-length data using tree based regression: an example using Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea
sampled catch based on the median length of Antarctic toothfish for each set using the observer length ... , rather than giving equal weights to all tows. Two variables (depth and SSRU) were used by the tree ... -length data using tree based regression: an example using Antarctic toothfish (Dissostichus mawsoni) in ...
Meeting Document : WG-FSA-SAM-05/8 : Auteur(s): N.L. Phillips, A. Dunn and S.M. Hanchet (New Zealand)
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A simulation study of krill fishing by an individual Japanese trawler (SC-CAMLR-VI/BG/37)
Japanese krill trawler over a half-month period. It is based on an underlying krill distribution model ... Abstract: A model is set up for the operation (which includes both searching and fishing) of a ... the operation is compared with (and partially tuned to) statistics for a sample of data from the ... than in the model. Two ad hoc model modifications are introduced to eliminate this inconsistency ...
Meeting Document : WS-KCPUE-89/04 : Auteur(s): D.S. Butterworth (South Africa)
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An assessment of Chaenocephalus aceratus and Pseudochaenichthys georgianus in Subarea 48.3
for these two species by assuming that 75% of the ‘unidentified fish’ caught by the Soviet Union in ... future. Author(s): D.J. Agnew (Secretariat) and K.-H. Kock (Germany) Title: An assessment of ... Subarea 48.3 since 1977 but have never been fully assessed by the Working Group on Fish Stock Assessment ... the years 1977 to 1988 consisted of catches of C. aceratus and P. georgianus. Biological, age-length ...
Meeting Document : WG-FSA-90/06 : Auteur(s): D.J. Agnew (Secretariat) and K.-H. Kock (Germany)
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A simulation study of krill fishing by an individual JAPANESE trawler
Japanese krill trawler over a half-month period. It is based on an underlying krill distribution model ... Abstract: A model is set up for the operation (which includes both searching and fishing) of a ... the operation is compared with (and partially tuned to) statistics for a sample of data from the ... than in the model. Two ad hoc model modifications are introduced to eliminate this inconsistency ...
Meeting Document : SC-CAMLR-VII/BG/37 : Auteur(s): D.S. Butterworth (Invited Expert)
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An assessment of the conservation status of albatrosses
, the Black-browed (Near Threatened) and Laysan Albatrosses are classified as Lower Risk. For two ... regarding population trend and status provides an inadequate basis for classification and these are assessed ... taxonomic revisions of albatrosses and the new IUCN criteria for identification of threatened taxa. The ... the 24 albatross species recognized in the new taxonomy, two species (Amsterdam Albatross and Chatham ...
Meeting Document : WG-FSA-97/59 : Auteur(s): Croxall, J.P., Gales, R.
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AN ASSESSMENT OF ARTIFICIAL BAIT (NORBAIT™) AS A MEANS OF REDUCING THE INCIDENTAL CATCH OF MACROURUS AND OTHER BYCATCH SPECIES IN HIGH LATITUDE TOOTHFISH FISHERIES
line with control mags baited with squid, the vessel’s preferred bait for toothfish and alternating ... mags using an artificial or reconstituted bait (Norbait 800C™). Results from Subarea 48.4 indicated ... trials were carried out. In this area although Norbait reduced the incidental bycatch of Macrourus, an ... . These reductions effectively meant an increase in fishing effort and time to achieve the same target ...
Meeting Document : WG-FSA-08/52 : Auteur(s): J.M. Fenaughty (New Zealand)
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An assessment of toothfish in Subarea 48.3 using CASAL
frequencies, and a poor fit to the CPUE data, for which an even higher process error CV was estimated (0.46 ... ). For the baseline assessment incorporating two fleets, the 2005 vulnerable biomass was estimated to be ... , the estimated long term yield is 4910 t for the baseline two-fleet assessment, while for the one-fleet ... Abstract: The CASAL software has been successfully applied to an assessment of the stock of ...
Meeting Document : WG-FSA-05/16 : Auteur(s): R.M. Hillary, G.P. Kirkwood and D.J. Agnew (United Kingdom)
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An exploration of the biological data used in the CCAMLR Subarea 48.3 Patagonian toothfish stock assessments
Abstract: WG-FSA 2018 noted that changes in productivity parameters may impact assessment ... . Author(s): E. MacLeod, K. Bradley, T. Earl, M. Söffker and C. Darby Title: An exploration of the ... Consent: No Delegation responsibility for releasing documents: United Kingdom ...
Meeting Document : WG-SAM-2019/32 : Auteur(s): E. MacLeod, K. Bradley, T. Earl, M. Söffker and C. Darby