Search results
-
Investigation of the sensitivity of the Ross Sea toothfish assessment to withholding subsets of the available data
and/or tag recapture data. Examining the impact of considering a subset of the available data simulates both ... as more years’ data becomes available. The 2009 stock assessment of Antarctic toothfish in the Ross Sea ... was used as a sensitivity to examine the impact of withholding data from an assessment based on a smaller ... and shorter data set. In both instances the ‘base case’ model was used, i.e., the models that were used to set ...
Meeting Document : WG-SAM-11/17 : Author(s): S. Mormede (New Zealand)
-
A bathymetric data framework for conservation in the Ross Sea region
Abstract: Bathymetric data are currently used inter alia to define management boundaries ... , and inform ecosystem-based management through bioregionalisation. Several data sources for bathymetric data ... exist, and these sources improve with time through additional data collection and improved analytical ... methods. We developed an algorithm to summarize bathymetric point data (x,y,z) for the Ross Sea region ...
Meeting Document : WG-SAM-10/18 : Author(s): S.J. Parker, B. Wood, S.M. Hanchet and A. Dunn (New Zealand)
-
Use of biological data to inform bioregionalisation of the Southern Ocean
spatially comprehensive species distribution layers from discontinuous biological data, by fitting complex ... and scale-dependent relationship between species abundance and available environmental data. These species ... data without the need for environmental proxies. We describe one method, called BRT (Boosted Regression ... and aggregate data layers for pelagic zooplankton using a circumpolar dataset collected by Continuous Plankton ...
Meeting Document : WS-BSO-07/7 : Author(s): M. Pinkerton, B. Sharp and J. Leathwick (New Zealand)
-
Maximum entropy reconstruction of stock distribution and inference of stock density from line-transect acoustic survey data
distribution from acoustic line-transect data. MaxEnt is founded on the bedrock of probability theory ... and allows the most efficient possible use of known data in the inference process. The method takes explicit ... account of spatial correlation in the observed data and seeks to reconstruct a distribution of density ... across the whole survey area that is both consistent with the observed data and for which the entropy ...
Meeting Document : WG-EMM-02/35 : Author(s): A.S. Brierley, S.F. Gull and M.H. Wafy (United Kingdom)
-
EXPLORATORY ASSESSMENT METHODS FOR EXPLORATORY FISHERIES: AN EXAMPLE CASE USING CATCH, IUU CATCH AND TAGGING DATA FOR DIVISION 58.4.3A
for exploratory fisheries and by-catch species, where catch data and mark-recapture data are present but more ... detailed data, specifically age or length structured data on catches or surveys, is either missing ... or poorly sampled. As an example case we use the catch data, legal and IUU, and the mark-recapture data ... ASSESSMENT METHODS FOR EXPLORATORY FISHERIES: AN EXAMPLE CASE USING CATCH, IUU CATCH AND TAGGING DATA ...
Meeting Document : WG-SAM-08/05 : Author(s): R.M Hillary (UK)
-
Assessment models for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea including data from the 2005/06 season
–B), using revised catch, CPUE, catch-at-age and tag-recapture data from New Zealand vessels. The updated ... entirely due to the impact of the catch-at-age data from the shelf fishery. Parameterising the model ... to better explain these data resulted in estimates of initial and current biomass that were very similar ... to those presented in 2005. The inclusion of the 2005 tag-release and the 2006 tag-recapture data had ...
Meeting Document : WG-FSA-06/60 : Author(s): A. Dunn and S.M Hanchet (New Zealand)
-
Acoustic data collection by the krill fishing industry to improve the monitoring of krill abundance
this fishing vessel data collection program and provide advice on the timing and frequency for conducting ... acoustic transects; the methods for the data transmission to the Secretariat including the use ... of EchoExplore to provide a meta-data catalogue of the data and whether to have acoustic data transferred ... to the Secretariat as complete (raw) acoustic data files for processing and/or analysis products (e.g. from ...
Meeting Document : SG-ASAM-2019/01 : Author(s): K. Reid and J. Arata
-
Calculation of indices of sea-ice concentration using digital images from the National Snow and Ice Data Centre
Abstract: A method is described for calculating indices of sea ice distribution from digital data ... distributed by the National Snow and Ice Data Centre, Colorado, USA. Data consist of an image of the Antarctic ... , made up of 312x332 pixels, each having a dimension of 25x25km, for every day in the year. Primary data ... these primary data. The techniques used are validated against alternative known data. Author(s): Agnew, D.J ...
Meeting Document : WG-EMM-95/11 : Author(s): Agnew, D.J.
-
Automated data processing using Echoview
Abstract: Increasing volumes of acoustic data are being collected which necessitates ... a reappraisal of many of the current methods for data processing and analysis. For some acoustic data sets ... manual processing is no longer an option; the large size of the data set is preventing analysis ... . This document provides an overview of an automated procedure for processing acoustic data that is illustrated ...
Meeting Document : SG-ASAM-15/01 : Author(s): M.J. Cox (Australia), G. Skaret (Norway), L.-M.K. Harrison and R. Harcourt (Australia)
-
Preliminary assessment models of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea including data from the 2005/06 season
–B), by including tag-recapture data for 2005–06 from New Zealand vessels. The updated assessment resulted ... . The inclusion of the 2005 release and the 2006 recapture data had the effect of only slightly modifying ... the estimates from the models, suggesting that the new data had a similar pattern to that of previous years ... . Model sensitivities using tag-recapture data from all vessels, revised biological parameters ...
Meeting Document : WG-FSA-SAM-06/11 : Author(s): Dunn, A. & Hanchet, S.M.