Resultados de la búsqueda
-
Theoretical considerations for estimating the density of cohorts and mean recruitment of Patagonian toothfish (Dissostichus eleginoides) based on research trawl survey data
fishery. At the 2003 meeting of WG-FSA a number of inconsistencies were identified in the estimation of ... , recognizing the importance of obtaining a consistent and reliable recruitment series for review at the 2004 ... assessing the long-term yield for toothfish fisheries in CCAMLR uses estimates of density of juvenile ... toothfish derived from research trawl surveys as an estimate of absolute abundance of recruitment to the ...
Meeting Document : WG-FSA-04/92 : Autor(es): C.R. Davies, E.M. van Wijk and A.J. Constable (Australia)
-
Reconciling theoretical versus empirical target strengths of krill; effects of phase variability on the distorted wave Born approximation
scattering from elements of a discretized bent cylinder. It was empirically validated at 120 kHz near ... Abstract: A model was recently proposed to predict the target strengths (TS) of Antarctic krill ... ]. Based on the distorted wave Born approximation (DWBA), the model depends upon the coherent summation of ... broadside incidence (?? 90°), but large discrepancies were observed at other angles away from the main lobe ...
Meeting Document : WG-EMM-02/50 : Autor(es): D.A. Demer and S.G. Conti (USA)
-
Acoustic visualization of the three-dimensional prey field of foraging chinstrap penguins
presence of at least six, distinct krill aggregations and substantial vertical and horizontal patchiness at ... Abstract: Predator-prey interactions play an important role in determining the dynamics of ... ecosystems. Recently, concerns have arisen due to the commercial harvesting of Euphausia superba, the ... these concerns because of problems associated with determining the availability of krill to their ...
Meeting Document : WG-Joint-94/12 : Autor(es): J.E. Zamon, C.H. Greene, E. Meir, D.A. Demer, R.P. Hewitt and S. Sexton (USA)
-
Use of a population model to assess the impact of longline fishing on wandering albatross populations
Abstract: An age-structured model of a wandering albatross Diomedea exulans population is ... developed to simulate population trends over time, using demographic parameters from the population at ... Possession Island Crozets, during 1968 to 1986. The simulation results portray a population decreasing at a ... rate of 2.29% per year, which concurs with global population trends. Sensitivity analyses of model ...
Meeting Document : WG-IMALF-94/08 : Autor(es): Coleen L. Moloney, John Cooper, Peter G. Ryan and W. Roy Siegfried (South Africa)
-
A bioenergetics model assessment of the prey consumption of Adélie penguins in Subarea 48.1 and 48.2
breeding. We parameterised our analysis using data from the population of Adélie penguins breeding at Signy ... the population of Adélie penguins at Signy Island consumes 4,600 t of krill and 696 t of fish during a ... Abstract: We present a preliminary analysis to estimate the consumption of prey by Adélie ... Island, South Orkneys. We show that the highest levels of consumption occur during the crèche and pre ...
Meeting Document : WG-EMM-17/32 : Autor(es): C. M. Waluda, L. Emmerson, C. Southwell and P.N. Trathan
-
A proposal for large scale sampling of krill in the diet of predators across Area 48 to coincide with the CCAMLR synoptic survey
) whereas temporal changes have been addressed using time-series of samples from the diet of predators. At ... determine the level of concordance at other sites. Samples of krill from South Georgia, the South Orkney ... Abstract: There is a high degree of spatial and temporal variability in the population of ... Antarctic krill Euphausia superba across the Scotia Sea. Resolution of the spatial component of this ...
Meeting Document : WG-EMM-99/33 : Autor(es): K. Reid (United Kingdom)
-
Possible effects of different levels of fishing on krill on predators - some initial modelling attempts
Meeting of the CCAMLR's WG-Kril1 and WG-CEMP in 1992 to address this issue. First. estimates are made ... of the parameters of predator survival rates as functions of krill abundance, by considering a krill ... . Computations based on this model indicate that variability in the annual recruitment of krill results in ... . However, the analyses also raise a number of questions about the proper interpretation of the available ...
Meeting Document : WG-KRILL-93/43 : Autor(es): D.S. Butterworth and R.B. Thomson (South Africa)
-
Scientific background document in support of the development of a CCAMLR MPA in the Weddell Sea (Antarctica) – Version 2018 – Reflection on the recommendations by WG-EMM-17 and SC-CAMLR-XXXVI
raised at WG-EMM-17 and SC-CAMLR-XXXVI (SC-CAMLR-XXXVI, Annex 6, §§ 5.1-5.14). The implementation of ... recommendations and questions raised by WG-EMM-17 and SC-CAMLR-XXXVI was already presented at the Workshop of ... Spatial Management (Cambridge, UK, 2 to 6 July 2018), where the great amount of work was acknowledge and ... the updates were welcomed. With this document, the Delegation of Germany would also like to inform the ...
Meeting Document : SC-CAMLR-XXXVII/BG/15 : Autor(es): Delegation of Germany
-
EFFECT OF STERN-SETTING TUNNEL ON THE SINK RATE OF INTEGRATED WEIGHT LONGLINE (IWL)
the exit point at the water line on the vessel's transom. The exit point of the tube is ... Abstract: This paper describes a new vessel modification to allow setting of longlines via a ... rate of demersal integrated weight longline (IWL). The stern setting tunnel consists of an elongated ... line exits the baiting machine, which is positioned in the aft section of the stern setting deck, to ...
Meeting Document : WG-FSA-08/38 : Autor(es): I. Hay and G. Robertson (Australia)
-
A review of national observer training and education programs (Scheme of International Scientific Observation)
Abstract: At CCAMLR-XXV, the Scientific Committee noted that the implementation of the observer ... increase their attendance at the meetings of WG-FSA and WG-IMAF. Author(s): Secretariat Title: A review ... program and the application of observer requirements could be improved by adopting a standard approach to ... education and training for observers in these fisheries (SC-CAMLR-XXV, paragraph 2.11). A review of current ...
Meeting Document : SC-CAMLR-XXVI/BG/09 Rev. 1 : Autor(es): Secretariat