Search results
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Assessment of fishable krill biomass on the basis of the acoustic surveys results using geostatistical methods
Abstract: ABSTRACT Applicability of geostatistical methods in processing the acoustic fields of krill density based on the acoustic survey data is demonstrated. The results obtained indicate usefulness of these methods in studying the structure of krill density field for biomass assessment in
Meeting Document : WG-SAM-10/07 Rev. 1 : Author(s): S.M. Kasatkina and P.S. Gasyukov (Russia)
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Estimation of natural mortality using catch-at-age and aged mark-recapture data: a simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation
Abstract: Attempts to estimate natural mortality, as a single constant M, simultaneously with other model parameters in integrated assessments via CASAL for the Heard and McDonald Islands (HIMI, CCAMLR Division 58.5.2) Patagonian toothfish (Dissostichus eleginoides) fishery have been unsuccessful.
Meeting Document : WG-SAM-10/11 Rev. 1 : Author(s): S.G. Candy (Australia)
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Evaluating the impact of multi-year research catch limits on overfished toothfish populations
Abstract: In stocks that have been depleted by overfishing, the benefits of additional fisheries removals for research purposes need to be evaluated against the risks that such catches may contribute to delaying the recovery of such stocks. Through simulating a Dissostichus eleginoides stock that
Meeting Document : WG-FSA-10/42 Rev. 1 : Author(s): D.C. Welsford (Australia)
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Application of continuous time Markov chains to modelling animal movement: estimation of movement rates and retention times for Patagonian toothfish
Abstract: The study of animal movement and distribution has been a central focus in ecology since the inception of the science. However, continuous-time, discrete state models have received relatively little application in data analyses or prediction in studies movement. Here we develop a
Meeting Document : WG-FSA-SAM-06/16 : Author(s): C. Wilcox, M. Bravington and D. Peel (Australia)
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List of Participants
Title: List of Participants Approval: Approved
Meeting Document : WG-FSA-SAM-06/02
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List of Documents
Title: List of Documents Approval: Approved
Meeting Document : WG-FSA-SAM-06/03
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Using mark-recapture and catch-age data to estimate fishing and natural mortality for the Patagonian toothfish at South Georgia
Abstract: This paper develops a Bayesian mark-recapture model for estimating both fishing and natural mortality, and integrates catch-at-age data into the estimation model, to aid in distinguishing between natural and fishing mortality. The model essentially follows tagged cohorts, with the
Meeting Document : WG-FSA-SAM-06/06 : Author(s): R.M. Hillary and D.J. Agnew (United Kingdom)
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A von Bertalanffy growth model for Division 58.5.2 fitted to length-at-age data and a comparison of predicted with observed growth from mark–recapture data
Abstract: Length-at-age data for the Patagonian toothfish (Dissostichus eleginoides) caught by trawl in Heard Island fishery were fitted using a von Bertalanffy (VB) growth model taking into account variable probability (VP) sampling of fish that were aged. Sub-sampling of random length frequency
Meeting Document : WG-FSA-SAM-06/07 : Author(s): S.G. Candy, A.J. Constable, T. Lamb and R. Williams (Australia)
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Revised estimates of the biological parameters for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea
Abstract: This report updates the estimates of the biological parameters for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea (Subareas 88.1 and SSRUs 88.2A–B). We present revised estimates of the von Bertalanffy growth curves, length weight relationship, and natural mortality based on
Meeting Document : WG-FSA-SAM-06/08 : Author(s): A. Dunn, P.L. Horn and S.M. Hanchet (New Zealand)
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Developments towards an investigation of potential bias from the analysis of tag–release and recapture data in Ross Sea Antarctic toothfish abundance estimates
Abstract: This report outlines developments towards evaluating bias in abundance estimates for the current tagrecapture programme for Antarctic toothfish in the Ross Sea. We present an initial approach that uses the current data on catch (C2 data), tag-recovery effort and tag-release data from
Meeting Document : WG-FSA-SAM-06/10 : Author(s): A. Dunn (New Zealand)