Search results
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Fish by-catch in the krill fishery: 2016 update
Chaenodraco wilsoni the most frequently reported in both datasets. The estimated total annual mass of fish by ... modal size class of <10 cm. The fish species taken as by-catch in the krill fishery are the same ... species (and size classes) as those reported in the diet of ‘krill-dependent’ predators. There is evidence ... of both an increase in the data quality from the observer scheme, as reflected in the reduced ...
Meeting Document : WG-FSA-16/04 : Author(s): CCAMLR Secretariat
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Modifications to the Generalised Yield Model in 2004, version GYM501E.EXE
Abstract: The Generalised Yield Model is used by the WG-FSA in the assessments of Champsocephalus ... in 2004 an error in the calculation of the recruitment series from survey data was detected. This ... error does not affect the assessments undertaken in recent years. This paper presents the nature of the ... error and the manner in which it was corrected. The recruitment series is the estimate of abundance of ...
Meeting Document : WG-FSA-04/91 : Author(s): A.J. Constable (Australia)
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Revised input parameters and implications for the Antarctic toothfish (Dissostichus mawsoni) stock assessment in Subareas 88.1 and 88.2
Abstract: In this paper, we address a number of aspects of the model inputs and parameters of the ... runs that investigate the sensitivity of the 2006 stock assessment to changes in these model inputs and ... consistent patterns in length frequencies over the duration of the fishery. Including terms for nation ... recaptured. Inclusion of observations of the 2006 fish recaptured in 2007 had the greatest impact on the ...
Meeting Document : WG-SAM-07/6 : Author(s): A. Dunn and S.M. Hanchet (New Zealand)
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Simulations to evaluate model performance for Antarctic toothfish stock assessment in the Amundsen Sea region
(preliminary recaptures) in 2017. The aim of this paper is to ascertain when the Amundsen Sea region stock ... in estimates of biomass, the likely biases, and to set expectations for mark-recapture data for the ... models showed that using two independent models lead to higher estimates of biomass in the North and ... lower estimates of biomass in the South, but that the two independent models fitted the data poorly ...
Meeting Document : WG-SAM-17/40 : Author(s): S. Mormede and S. Parker
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Revised assessment models for Patagonian toothfish in research block 58.4.4b_1 (SSRU 58.4.4bC) for the years 1990–2014
status assessments of Dissostichus eleginoides in the research block 58.4.4b_1 in the last WG-SAM meeting ... in the revised OB_1b model were estimated to be 71 tonnes, which corresponded 43 % of that (163 ... tonnes) in the same model of the last WG-SAM report. The median MCMC estimates of the initial and current ... . Any harvest level lead to the CCAMLR risk 2 value > 50% in the beginning of 35 year projection ...
Meeting Document : WG-FSA-15/23 : Author(s): K. Taki (Japan), S. Mormede (New Zealand) and T. Ichii (Japan)
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Assessment models for Patagonian toothfish in research block 58.4.4b_1 (SSRU 58.4.4bC) for the years 1990-2014
assessments of Dissostichus eleginoides in the research block 58.4.4b_1 following the recommendation of the WG ... estimates of OB_1b model (OB_1b_noage model). The fits to CPUE in 2008 and MPD profiles for tags in the same ... first research in 2008. The removal of 2008 CPUE data improved the CPUE fits in OB_1b model. The fix of ... size of fish available for catches in this area. The OB_1b_notag model did not improve any fits of ...
Meeting Document : WG-SAM-15/25 : Author(s): K. Taki (Japan), S. Mormede (New Zealand) and T. Ichii (Japan)
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Haul data analysis from the Polish krill fishery in 1997–1999
of 60-70 minutes. Differences in catch rates in various areas and years were observed. The highest ... -time ones in the area of King George, however, in 1997 and 1998 the situation was the opposite. Author ... Abstract: The analysis of fishing data obtained from the ship’s log of the Polish commercial ... vessel M/T Pollux facilitated the characterization of catches and concentrations of krill between ...
Meeting Document : WG-EMM-00/17 : Author(s): E. Jackowksi (Poland)
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Fish by-catch in the krill fishery: 2017 update
evidence of an increase in the data quality from the observer scheme, as well as an increase in the ... reporting of fish by-catch in the commercial krill fishery catch data. There was a high degree of overlap in ... frequently reported in both datasets. The length-frequency distribution of all taxa for which >200 fish ... taken as bycatch in the krill fishery are consistent with those reported in the diet of ‘krill ...
Meeting Document : WG-FSA-17/04 : Author(s): CCAMLR Secretariat
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Physical forcing in the southwest Atlantic: ecosystem control
Abstract: In the southwest Atlantic sector of the Southern Ocean, temporal variability in the ... temperature at South Georgia shows the presence of high levels of autocorrelation, with periodicity evident in ... physical environment has been recorded since the early part of the last century. For example, ocean ... anomaly data for the El Niño 4 region in the Pacific show that variability at South Georgia also reflects ...
Meeting Document : WG-EMM-04/34 : Author(s): P.N. Trathan, E.J. Murphy, J. Forcada, J.P. Croxall, K. Reid and S.E. Thorpe (United Kingdom)
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DEFINING TAG RATES AND TACS TO OBTAIN SUITABLY PRECISE ABUNDANCE ESTIMATES FOR NEW AND EXPLORATORY FISHERIES IN THE CCAMLR CONVENTION AREA
formula that gives the expected coefficient of variation of the abundance estimate in terms of the number ... of releases and recaptures, which can in turn be expressed in terms of the tagging rate per tonne ... given precision in the Petersen abundance estimate. To show the reliability of the precision ... be extremely useful in terms of defining suitable catch levels and tagging rates required to obtain a ...
Meeting Document : WG-SAM-08/06 : Author(s): R.M. Hillary (UK)