Résultats de la recherche
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Summary of Ross Sea skate tagging programme results
years, and 47 (0.5%) have been recaptured. The recapture of tagged Amblyraja georgiana after up to four ... georgiana moved very little, even after four years at liberty. There was no movement between SSRUs, and the ... Abstract: Over 9,000 skates have been tagged and released in the Ross Sea over a period of seven ... 1,000 m and tagged. In-water tagging greatly reduces the incidence of broken jaws in skates, and ...
Meeting Document : WG-FSA-06/32 : Auteur(s): S.L. Ballara, A. Dunn and M.P. Francis (New Zealand)
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Growth per molt of male snow crab Chionoecetes opilio from Conception and Bonavista Bays, Newfoundland
predicted the size after two molts in close agreement with a regression line fitted to data on double ... range 80-110 mm carapace width, the predicted size after molting in mm is equal to 7.398 + 1.038 x pre ... , Newfoundland, in order to estimate the increase in size at the time of molting. Ninety-two animals were ... recaptured which had usable information on growth increments. Based on the amount of growth, we hypothesized ...
Meeting Document : WS-CRAB-93/12 : Auteur(s): D.M. Taylor and J.M. Hoenig (USA)
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Movement and growth of tagged toothfish around South Georgia and Shag Rocks (Subarea 48.3)
the same longline vessel in 2002 after up to two months at liberty. The fish tagged during the ... Abstract: In 2000 the UK started a toothfish (Dissostichus eleginoides) tagging programme. The ... aims were to investigate the spatial and temporal movement of fish and to validate growth estimates ... Oxytetracycline which places a marker on the otolith indicating the date of injection and release. To date, 50 ...
Meeting Document : WG-FSA-02/28 : Auteur(s): T.R. Marlow, D.J. Agnew and I. Everson (United Kingdom)
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Population of macaroni penguins Eudyptes chrysolophus at Marion Island, 1994/95 to 2002/03, with information on breeding and diet
decrease of 88% between 1979/80 and 2002/03, most of the decrease occurring after 1983/84. At Marion Island ... correlated. Both showed a marked decrease in 1998/99, after the El Niño of 1997/98. In most seasons from 1994 ... subantarctic Marion Island have decreased since the early 1980s. Estimates of the population at the island fell ... large colonies, at Bullard Beach and Kildalkey Bay, account for about 85% of the overall population. At ...
Meeting Document : WG-EMM-03/15 : Auteur(s): R.J.M. Crawford, J. Cooper and B.M. Dyer (South Africa)
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INTERACTIONS OF PATAGONIAN TOOTHFISH FISHERIES WITH KILLER AND SPERM WHALES IN CROZET EXCLUSIVE ECONOMIC ZONE: AN ASSESSMENT OF DEPREDATION LEVELS AND INSIGHTS ON POSSIBLE MITIGATION SOLUTIONS
operational factors on depredation. When killer whales were absent at the beginning of the line hauling ... Abstract: Within the Crozet Islands Exclusive Economic Zone (EEZ), the Patagonian toothfish ... ) proposes operational measures to reduce depredation levels using the current longline fishing technique ... . From 2003 to 2008, sperm whales alone, killer whales alone, and the two species co-occurring were ...
Meeting Document : WG-IMAF-09/12 : Auteur(s): P. Tixier, N. Gasco, G. Duhamel and C. Guinet (France)
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Acoustic estimates of krill density at South Georgia, December/January 1998/99
krill density there. Densities (east = 11.1 g m-2, west = 12.0 g m-2) were towards the lower end of the ... Abstract: Dual frequency (38 and 120 kHz) acoustic data from grid surveys in two boxes to the ... range observed over the past two decades, but not abnonnally low, and comprised almost entirely of large ...
Meeting Document : WG-EMM-99/20 : Auteur(s): A.S. Brierley and C. Goss (United Kingdom)
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Variation in echosounder calibration with temperature and some possible implications for acoustic surveys of krill biomass
conditions, calibrated gain settings differ markedly from those applied in the Antarctic, even after ... of factors including, fundamentally, accurate echo-sounder calibration. The Simrad EK500 scientific ... transducer gains were detected at both 38 and 120 kHz between calibrations conducted at the two locations. At ... calibration parameters were to be employed on survey around South Georgia, and no account were taken of the ...
Meeting Document : WG-EMM-97/52 : Auteur(s): Watkins, J.L., Woodroffe, P., Brierley, A.S., Goss, C.
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Towards a validation of ageing in mackerel icefish (Champsocephalus gunnari) – can we estimate age more accurately?
older than 3 or 4 years were aged. These differences could not be reconciled at the end of the exchange ... ototlith exchange programme in the late 1980’s revealed considerable differences between readers when fish ... . A second age determination workshop on mackerel icefish to improve the accuracy of age determination ... was agreed upon at the last meeting of the ‘Working Group on Fish Stock Assessment’. Our report ...
Meeting Document : WG-FSA-05/23 : Auteur(s): K.-H. Kock (Germany) and Zh.A. Frolkina (Russia)
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Marine debris and fishing gear associated with seabirds at Bird Island, South Georgia, 1994/95
1994/1995 commercial fishery around South Georgia did not start until March 1995, the end of the data ... Abstract: This report describes and quantifies the occurrence of marine debris and fishing gear ... associated with seabirds in the same way as in 1993/1994. In 1994/1995 there was a decrease in both the ... , the decrease is due at least in part to, first, fewer birds examined than last year as a consequence ...
Meeting Document : SC-CAMLR-XIV/BG/09 : Auteur(s): Delegation of the United Kingdom
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Supporting industry sustainability and CCAMLR monitoring with Sailbuoy operations
in the Antarctic. The trials were successful giving data during continuous operations from end of ... Abstract: This paper describe tests with the Sailbuoy during the 2019 RV Kronprins Haakon cruise ... -fields. Perspectives and plans for the development of a “Sailbuoy for krill” including advanced on board ...
Meeting Document : WG-EMM-2019/17 : Auteur(s): R. Øyerhamn, O.R. Godø and A. Lowther