Search results
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Otolith and body size relationships in the bigeye grenadier (Macrourus holotrachys) in CCAMLR Subarea 48.3
Abstract: A large sample of otoliths from Bigeye Grenadier (Macrouros holotrachys) caught as ... their usefulness as predictors of fish size was determined. Otolith mass provides a good measure of fish ... length whereas otolith length and width measurements provide less accurate estimates of fish length ... . Seasonal variations in fish mass with reproductive condition need to be considered if predictions of mass ...
Meeting Document : WG-FSA-01/39 : Author(s): S. Morley and M. Belchier (United Kingdom)
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Yet further krill yield computations
Abstract: Preliminary computations are carried out for the krill yield model of Butterworth et al ... . (1993), adjusted as requested by the fifth meeting of WG-KRILL. This involves modifying the input ... distributions for the lengths at recruitment and maturity, natural mortality and the extent of recruitment ... variability. Sensitivity tests are carried out to assess the consequences of avoidance of gravid females by ...
Meeting Document : WG-Krill-94/23 : Author(s): R.B. Thomson and D.S. Butterworth (South Africa)
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Near-shore acoustic surveys for Antarctic krill at South Georgia, January 2004
Islands and off the Barff Peninsula, South Georgia, from a 59 foot yacht in January 2004. The purpose of ... were collected in seastate 6 with winds up to 30 knots and swells of approximately 2.5 m at survey ... speeds of up to 7 knots. Echo intensity data were scaled to krill density using a target strength ... determined from the length distribution of krill sampled from fur seal scats at Bird Island (mean krill ...
Meeting Document : WG-EMM-04/35 : Author(s): A.S. Brierley, P.N. Trathan, J. Poncet and A. Morton (United Kingdom)
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Assessment models for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea including data from the 2006/07 season
Abstract: We provide an update of the Bayesian sex and age structured population stock assessment ... model resulted in a slightly lower estimate of initial biomass than the 2006 base case. The inclusion of ... the 2007 recaptures of 2006 tags released had the most substantive impact on the model estimates ... . Models using tag-recapture data from all vessels are also presented. Inclusion of all vessels tagging ...
Meeting Document : WG-FSA-07/37 : Author(s): A. Dunn and S.M. Hanchet (New Zealand)
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Characterising the preferred at-sea habitats used by chinstrap penguins and the fishery for Antarctic krill: slow-flowing, nearshore waters over shallow bathymetry
of chinstraps breeding at the South Shetland Islands, based on the distance from the colony, and the ... bearing to the shelf edge, adjusting for the at-sea density of Pygoscelis penguins from other colonies ... locations of animals during the breeding season from untracked colonies, even in different regions and ... bathymetry, but that they also sometimes move towards the edge of the continental shelf where the faster ...
Meeting Document : WG-EMM-17/34 : Author(s): P.N. Trathan, V. Warwick-Evans, J. Hinke, E.F. Young, A.P.B. Carneiro, M.P. Dias, K. Kovacs, O.R. Godø and M. Santos
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Modelling krill recruitment
Abstract: A method is developed for using observed values of the mean proportion of recruits and ... its variance to model recruitment in a krill population in terms of numbers of recruits. The method ... includes the calculation of natural mortality and other parameters consistent with the observed ... proportional recruitment parameters. A procedure is given for generating families of recruitment functions ...
Meeting Document : WG-KRILL-93/13 : Author(s): W. de la Mare (Australia)
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Fishing gear, marine debris and oil associated with seabirds at Bird Island, South Georgia, 2001/02
Abstract: This report describes and quantifies occurrences of fishing gear, marine debris and oil ... association with wandering albatrosses compared to last year, but the number of items (63) remains well above ... the mean since annual recording began. The number of items of fishing gear associated with grey-headed ... albatrosses (mostly small plastic fragments) than in any previous year. Small quantities of marine debris ...
Meeting Document : SC-CAMLR-XXI/BG/07 : Author(s): Delegation of the United Kingdom
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Krill fishery report: 2012 update
were fishing, at the time of preparing this report, and 935 t of krill has been reported so far for ... June. The forecast total catch of krill for this season ranges approximately from 108000 to 151000 t ... . In 2010/11, 13 vessels fished for krill in Area 48 and the total catch of krill was 180986 t; two ... vessels used the continuous fishing system. The largest catch of krill was taken off the South Orkney ...
Meeting Document : WG-EMM-12/05 : Author(s): Secretariat
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Skate tagging in the Heard Island and McDonald Island (Division 58.5.2) toothfish fishery up to 2013
take three species of skates, Bathyraja eatonii, B. irrasa and B. murrayi, as their most common ... biology of these species. In the 13 years, over 12,000 skates have been tagged, with 112 recaptures, a ... recapture rate of less than one percent. The average distance between release and recapture for each of the ... liberty of nearly eight years for one B. irrasa. Range of movement in depth was between-266 m and 280 m ...
Meeting Document : WG-FSA-13/22 : Author(s): G.B. Nowara, T.D. Lamb and D.C. Welsford (Australia)
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Casal2: New Zealand’s integrated population modelling tool
assessment pack-age since 2002. Casal2 replicates most of CASAL’s functions such as many stocks, fisheries ... , and areas; age-or length-based dynamics; the use of several data sources (e.g., abundance indices, age ... efficient program-ming practices and tools than CASAL. CASAL has enabled a more efficient use of resources ... for stockassessments, such as allowing a wider range of staff to conduct assessments, helped ...
Meeting Document : WG-SAM-18/P01 : Author(s): I. Doonan, K. Large, A. Dunn, S. Rasmussen, C. Marsh and S. Mormede