Résultats de la recherche
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A preliminary assessment of mackerel icefish (Champsocephalus gunnari) in Division 58.5.2, based on results from the 2013 random stratified trawl survey
vicinity of Heard Island during April 2013. This paper provides a preliminary assessment of mackerel ... using standard CCAMLR methods. A large cohort of fish, estimated to be 3+, dominates the population in ... both abundance and biomass. Two scenarios for harvest are presented – a typical two year projection of ... the population, and a projection accounting for the fact that the abundant 3+ year class is likely to ...
Meeting Document : WG-FSA-13/23 : Auteur(s): D.C. Welsford (Australia)
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A false positive in the CCAMLR tag overlap statistic arising from low catch volume and consequent limited sample size
2013/14 the vessel Argos Georgia achieved a tag overlap statistic of 52% rather than the required ... minimum of 60% as specified in CM 41-01. A review of the data indicates that the number of fish tagged was ... of fish tagged did not match closely with that of the catch resulting in a the overlap statistic, as ... not a case of only small fish being tagged. The low tag overlap statistic is shown to be a sampling ...
Meeting Document : WG-FSA-14/31 : Auteur(s): C. Darby (United Kingdom)
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Are we there yet? Evaluating and reporting progress towards a Representative System of Marine Protected Area across the CAMLR Convention Area
Abstract: In 2008, CCAMLR agreed that the establishment of a representative system of marine ... protected areas (RSMPA) by 2012 was a priority. This assessment shows that the Scientific Committee and ... Commission can be kept informed of progress towards this goal using a relatively short list of simple ... contributions towards a RSMPA, however we are not there yet. Establishment of the proposed MPAs in Domain 1 ...
Meeting Document : WS-SM-18/14 : Auteur(s): D.C. Welsford
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Are we there yet? Evaluating and reporting progress towards a Representative System of Marine Protected Area across the CAMLR Convention Area
Abstract: In 2009, CCAMLR agreed that the establishment of a representative system of marine ... protected areas (RSMPA) by 2012 was a priority. This assessment shows that the Scientific Committee and ... Commission can be kept informed of progress towards this goal using a relatively short list of simple ... contributions towards a RSMPA, however we are not there yet. Establishment of the proposed MPAs in Domain 1 ...
Meeting Document : WG-EMM-18/31 : Auteur(s): D.C. Welsford
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A proposal for large scale sampling of krill in the diet of predators across Area 48 to coincide with the CCAMLR synoptic survey
Abstract: There is a high degree of spatial and temporal variability in the population of ... variability requires a 'snapshot' of the krill population over the region (eg the CCAMLR B0 survey ... South Georgia krill in the diet of Antarctic fur seal Arctocephalus gazella show a good level of ... and March using a standard methodology. This data will he used to example the level of concordance ...
Meeting Document : WG-EMM-99/33 : Auteur(s): K. Reid (United Kingdom)
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Spatial overlap of krill-dependent predators and krill fishery catches and a proposal for subdivision of catch limits in Subarea 48.1
Abstract: Progressing from Stage 1 to Stage 2 of a feedback management strategy requires a better ... appeared to be more stationary and did not respond as rapidly (or on as large a scale) to conditions that ... might affect the distribution of fishing effort. A comparison of CEMP parameters from two years with ... from a single SSMU. We propose that 85,000 tonnes, based on observed overlap and likely impacts of such ...
Meeting Document : WG-EMM-14/36 : Auteur(s): J.T. Hinke, M.E. Goebel (USA), M.M. Santos (Argentina), P.N. Trathan (UK), W.Z. Trivelpiece and G.M. Watters (USA)
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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
Abstract: A survey of mackerel icefish, Champsocephalus gunnari, was undertaken in Division ... 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 ... evidence of strong year classes recruiting to the population has led to a significant decrease in the ...
Meeting Document : WG-FSA-06/43 Rev. 1 : Auteur(s): D.C. Welsford (Australia)
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Calibration of an acoustic echo-integration system in a deep tank, with system gain comparisons over standard sphere material, water temperature and time
acoustic system with a standard sphere. It presents the results of an extensive calibration of a Simrad ... EK500 scientific echo sounder with a 120 kHz sprit-beam transducer in a refrigerated 10m deep tank ... ), transmitted pulse length (0.1, 0.3, and 1.0 ms), target depth (0.8- 7.5 m), and time (149 days). A discussion ... -integration system in a deep tank, with system gain comparisons over standard sphere material, water ...
Meeting Document : WG-KRILL-92/17 : Auteur(s): D.A. Demer and R.P. Hewitt (USA)
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A comparison of densities and length distribution of the Champsocephalus gunnari stock in Subarea 48.3 between years 1994 and 1995
determined by a search procedure yielding randomly selected clusters of stations located within the 50–150 ... ; 151–250 and 251–500 m depth strata. The cluster structure is considered as a nested factor in an ANOVA ... in a nested ANOVA and a paired t-test. Significant increases in density have been detected at all ... a probability function to mean densities should be improved, but their differences at replicated ...
Meeting Document : WG-FSA-95/34 : Auteur(s): Marschoff, E., Calcagno, J., Gonzalez, B.
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A feedback management strategy for the krill fishery in Subarea 48.1
Abstract: We present a Stage-2 strategy for in-season feedback management (FBM) of the krill ... fishery in Subarea 48.1. This strategy is a combination of two strategies that were separately proposed ... to the WG-EMM in 2015 and is based on a broad foundation of work undertaken to address a suite of ... action items specified by the WG-EMM. A decision rule to adjust catches in groups of SSMUs (gSSMUs) is ...
Meeting Document : WG-EMM-16/48 : Auteur(s): G.M. Watters, J.T. Hinke and C.S. Reiss