Search results

1. CCAMLR tagging program: tag link status update

   Abstract:  In order to reflect the level of confidence when linking a tag recapture to a tagging event, as well as an indication of the time and effort taken to make the link, the Secretariat introduced in 2011 a tag recapture link status code.  For the 2011 season, a total of 1433 tags have been

   Meeting Document : WG-SAM-12/22 : Author(s): Secretariat

2. Measures to avoid bias in abundance estimates of Dissostichus spp. based on tag-recapture data

   Abstract:  Using the simplest form of an abundance estimator using tag-recapture data, the Lincoln-Petersen equation, we summarise the processes that may occur during a tagging program that lead to difficulty in accurately estimating key parameters, and consequently introduce bias into an abundance

   Meeting Document : WG-SAM-12/23 : Author(s): D.C. Welsford and P.E. Ziegler (Australia)

3. Are tagging targets set in appropriate terms?

   Abstract:  Currently the target tagging rate to be achieved by vessels fishing in the CCAMLR area is set in terms of the number of fish tagged per mass of fish caught thereby mixing “units” of measure. This note questions whether it is appropriate to set the tagging targets these terms and suggests

   Meeting Document : WG-SAM-12/25 : Author(s): R.W. Leslie and C. Heinecken (South Africa)

4. The development of spatially and temporally controlled measures of survival and tag-detection for the CCAMLR tagging program

   Abstract:  A reliable commercial tagging program is critical to the successful assessment and management by CCAMLR of a number of toothfish fisheries in Antarctica. The evaluation of the tagging programme relies on two key aspects (i) that the tagged fish have a good chance of survival and (ii)

   Meeting Document : WG-SAM-12/30 : Author(s): S. Mormede and A. Dunn (New Zealand)

5. Recommendations for CCAMLR tagging procedures

   Abstract:  With the recognition that CCAMLR tagging programmes are used for abundance estimation of toothfish and skates, tagging operations need to be appropriately supported through documentation, training, and supplies. This paper reviews how tagging programme information could be effectively

   Meeting Document : WG-SAM-12/31 : Author(s): S. Parker, J. Fenaughty (New Zealand), E. Appleyard (Secretariat) and C. Heinecken (South Africa)

6. Drawing on international experience to improve performance of CCAMLR tagging programs

   Abstract:  Mark-recapture methodologies are commonly used to inform the management of fisheries. In addition to answering targeted research questions, tagging programmes are typically used to describe movement patterns relative to stock unit identification or to support spatial disaggregation of

   Meeting Document : WG-SAM-12/26 : Author(s): S. Parker and S. Mormede (New Zealand)

7. Viability criteria for tagging toothfish

   Abstract:  CCAMLR Conservation measures currently require vessels to tag only toothfish with a high probability of survival, but no objective criteria are provided for this evaluation. Achieving this requires an objective evaluation of the probability of survival of each fish to be tagged, which in

   Meeting Document : WG-SAM-12/27 : Author(s): S. Parker (New Zealand)

8. Two decades of variability in krill predators at Bird Island, South Georgia and their potential as ecosystem indicators

   Abstract:  The breeding performance of seabirds and seals at Bird Island, South Georgia, in the Southern Ocean, has been recorded annually for over two decades as part of a large marine ecosystem monitoring programme. We examined the mechanistic relationships between, and patterns of inter-annual

   Meeting Document : WG-EMM-12/16 : Author(s): S.L. Hill, C.M. Waluda, H.J. Peat and S. Fielding (United Kingdom)

9. Diet variability and reproductive performance of macaroni penguins (Eudyptes chrysolophus) at Bird Island, South Georgia

   Abstract:  We analysed summer diet and fledging mass of macaroni penguins Eudyptes chrysolophus breeding at Bird Island, South Georgia during the crèche period (January and February) between 1989 and 2010. Crustaceans were the main prey accounting for over 90 % of the diet by mass. Antarctic krill

   Meeting Document : WG-EMM-12/17 : Author(s): C.M. Waluda, S.L. Hill, H.J. Peat and P.N. Trathan (United Kingdom)

10. Warming effects in the Western Antarctic Peninsula Ecosystem: the role of population dynamic models for explaining and predicting penguin trends

    Abstract:  The Western Antarctica Peninsula and Scotia Sea ecosystems appear to be driven by complex links between climatic variables, primary productivity, krill and avian predators. There are several studies reporting statistical relationships between climate, krill and penguins population size.

    Meeting Document : WG-EMM-12/18 : Author(s): M. Lima and S.A. Estay (Chile)

Pages