Search results
-
Alternative method of the age composition assessment on the basis of surveys length data using mixture distributions
2000, 2002, 2004 in the South Georgia area, it is demonstrated that the method by Aitchison and ... bootstrap method result in different estimates of mean fish density in the length series. Verification of ... Mare commonly used by CCAMLR in icefish age composition of abundance indices determination. To solve ...
Meeting Document : WG-FSA-05/78 : Author(s): P. Gasyukov (Russia)
-
A review of models of Southern Ocean ecosystems: krill, ecosystems and the impacts of harvesting
Abstract: An ecosystem approach for the management of human activities in the Southern Ocean is ... enshrined in the principles of the Commission for the Conservation of Antarctic Marine Living Resources ... in the world. The main categories we consider are models of krill populations and life cycles ... , predator-prey models and models of ecosystems. A range of approaches has been developed in each of these ...
Meeting Document : WG-EMM-04/67 : Author(s): S.L. Hill, E.J. Murphy, K. Reid, P.N. Trathan (United Kingdom), A. Constable (Australia)
-
AN UPDATED DESCRIPTION AND PARAMETERISATION OF THE SPATIAL MULTI-SPECIES OPERATING MODEL (SMOM )
-predator-fishery dynamics is described. This has been developed in response to requests for scientific ... management units (SSMUs) in the Scotia Sea, to reduce the potential impact of fishing on land-based predators ... . The model includes krill as prey and four predator groups (penguins, seals, fish and whales) in each ... combinations of model parameters essentially try to bound the uncertainty in, for example, the choice of ...
Meeting Document : WG-SAM-08/17 : Author(s): É.E. Plagányi and D.S. Butterworth (South Africa)
-
Using mark-recapture and catch-age data to estimate fishing and natural mortality for the Patagonian toothfish at South Georgia
natural mortality, and integrates catch-at-age data into the estimation model, to aid in distinguishing ... analysed with the model. The ages covered by the analysed cohorts ranged from 5 to 13. In the model runs ... be lower than those estimated in previous stock assessments using both mark-recapture and catch data ... . There was additionally some suggestion of agestructure in the natural mortality-at-age. Author(s): R.M ...
Meeting Document : WG-FSA-SAM-06/06 : Author(s): R.M. Hillary and D.J. Agnew (United Kingdom)
-
Potential VMEs around Elephant and the South Shetland Islands (Subarea 48.1)
in the South Shetland Islands area. High biomass densities of VME indicator taxa, meeting the 10 kg ... new ‘diversity threshold’ is proposed in order to protect those VME taxa that do not occur in the ... Appendix II listed Antipatharia (black coral), which in the authors’ experience has never occurred at a ...
Meeting Document : WG-EMM-12/51 : Author(s): S.J. Lockhart (USA), N. Wilson (Australia) and E. Lazo-Wasem (USA)
-
Preliminary report on krill survey off the coast of East Antarctica (Enderby Land to Prydz Bay) February-March 2015
mammals in East Antarctica. The small scale variability of prey in key foraging locations near to land ... -based colonies of penguins and flying seabirds in East Antarctica. Feasibility and potential of ... better understand the ecosystem in the region. The survey completed 5 acoustic box surveys including a ...
Meeting Document : WG-EMM-15/22 : Author(s): S. Kawaguchi, A. Constable, L. Emmerson, C. Southwell, R. King, K. Westwood and K. Swadling (Australia)
-
Data on reproduction biology of Dissostichus mawsoni from the Ross Sea (Statistical Subarea 88.1)
longliner "Tronio" in 2007-2011 were given. Gonadosomatic indices (GSI) of 823 Antarctic toothfish ... individuals from various SSRU in the Ross Sea were calculated. For one specimen with maximum observed weight ... of gonads on various grounds in the Ross Sea during the fishery season confirmed previous conclusions ... cm, and among males- at length of 123-126 cm. In our collections, we noted occurrence of females with ...
Meeting Document : WG-FSA-11/04 : Author(s): A.K. Zaytsev (Russia)
-
CONTINUING CCAMLR’S FIGHT AGAINST IUU FISHING FOR TOOTHFISH EXECUTIVE SUMMARY OF THE REPORT BY TRAFFIC INTERNATIONAL AND WWF AUSTRALIA
(IUU) fishing, there remains evidence of IUU activities in the Convention area. This paper is the ... executive summary of a recent, soon to be published report produced by TRAFFIC International in conjunction ... -2007 with a view to provide an indication of the extent of the IUU catch. The report highlights that in ... estimates of IUU catch and to continue to improve the current MCS measures in order to minimise ...
Meeting Document : CCAMLR-XXVII/BG/38 : Author(s): Submitted by IUCN
-
Influence of data quality and quantity from a multiyear tagging program on an integrated fish stock assessment
, particularly the effects of the size of tagged fish compared with the size of fish in the catch (tag size ... relatively large number of size classes, low recapture numbers collected in short tagging programs with a 100 ... % tag size-overlap were sufficient for robust and unbiased assessments. Particularly in the early stages ... -age compared with catch-at-length improved recruitment estimates and resulted in more conservative ...
Meeting Document : WG-FSA-13/P03 : Author(s): P. Ziegler
-
Evidence of change to the environment, ecosystem and fishery within Area 48 indicates the need for continued precaution
Abstract: CCAMLR manages the krill fishery in Area 48 using a catch limit (the trigger level ... ) which was established in 1991 based on the maximum catches reported for each subarea. Since that time ... time catches in Subarea 48.1 have increased beyond the maximum pre-1991 catch for that subarea which ... levels in Subarea 48.1 and environmental stress on the krill stock), the need for precaution is likely to ...
Meeting Document : WG-EMM-2019/29 : Author(s): S. Hill and A. Atkinson