Search results
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What do we know about fish stocks in the Southern Scotia region? A review and prospects for future research
Abstract: Work on finfish in the southern Scotia Arc was restricted to taxonomy until the end of ... 1978/79. The fishery was lucrative for a few seasons only, and was closed in 1989/90. Stocks of finfish ... /beginning of the 1990’s. Since the early 1990’s, most species appeared to have changed little in abundance ... , and followed primarily fluctuations in year-class strength and the environment. However, stocks of ...
Meeting Document : WG-FSA-00/14 : Author(s): K.-H. Kock (Germany) and C. Jones (USA)
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Factors influencing Antarctic krill distribution in the South Shetlands
Abstract: The influences of biological and physical factors in the environment upon krill ... (Euphausia superba) distribution were studies in the area north of South Shetland Islands during 1990/91 ... . Hence, higher diatom biomass may be one of factors forming krill concentrations in the inshore and ... further discussed why the change in spatial distribution of krill occurs from early to late summer. Author ...
Meeting Document : WG-KRILL-93/38 : Author(s): T. Ichii, H. Ishii and M. Naganobu (Japan)
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Pleuragramma antarcticum distribution in the Ross Sea during late austral summer 2013
Pleuragramm antarcticum, including confirmation of the first known nursery ground in Terra Nova Bay. However ... the central Ross Sea and one location in the far south of the eastern Ross Sea (in the Bay of Whales ... ). Larval P. antarcticum made up more than 99% of the icthyoplankton in the western Ross Sea. Most of these ... Bay. The most numerous abundances (3400+ in each tow) of larval P. antarcticum were found along the ...
Meeting Document : WG-EMM-14/38 : Author(s): C. Brooks and K. Goetz (USA)
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Monitoring Antarctic toothfish (D. mawsoni) recruitment in the southern Ross Sea
survey monitoring the recruitment of Antarctic toothfish (Dissotichus mawsoni) in the southern Ross Sea ... was started in 2012. The first year established the feasibility of carrying out a random stratified ... data show the appearance of a strong year class in 2012 which progressed through each year to 2017 and ... the appearance of a second strong year class in 2016. Although the changes in age frequency were ...
Meeting Document : WG-FSA-17/57 : Author(s): S.M. Hanchet, S. Mormede, S. Parker, K. Large, A. Dunn and B. Sharp
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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)