Resultados de la búsqueda
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Further development of a krill fishery simulation model
Abstract: The model of the krill fishery presented in 1993 (wg-Krill-93/14) refined and applied ... catch. Closure of Livingston Island for the breeding period resulted in a 60% reduction in overlap with ... to account for variability in catch rates. The most successful management regime is found to be one ... the model predicts a 90% reduction in overlap with foraging predators, and a 15 to 20% reduction in ...
Meeting Document : WG-Joint-94/04 : Autor(es): D.J. Agnew (Secretariat)
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Comparison of equal-area cylindrical and circular piston transducers
Abstract: Design of sondes for in situ measurement of zooplankton or other scatterers requires ... choosing among alternative transducer geometries. This contribution addresses the problem of choosing ... between cylindrical and circular piston transducers by comparing the performance of the two according to ... dimensions of six fabricated cylindrical transducers, whose beam patterns have been measured by the ...
Meeting Document : WG-EMM-95/08 : Autor(es): Foote, K.G.
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Trade data analysis – Reconciliation of CDS data with fine-scale catch and effort data
demonstrated the effectiveness of the CDS to trace the catch of toothfish caught in the CCAMLR Convention Area ... implemented in the reconciliation of trade data and other relevant CCAMLR datasets. Author(s): CCAMLR ... Abstract: The reconciliation of CDS data with monthly fine-scale catch and effort data has ... ongoing. This reconciliation has demonstrated the success in the methodology and will in the future be ...
Meeting Document : CCAMLR-XXXVII/BG/14 Rev. 1 : Autor(es): CCAMLR Secretariat
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Antarctic fur seal population dynamics update and assessment of census error at SSSI No. 32, Livingston Island, South Shetlands, Antarctica (2000/2001)
of Antarctic fur seals, Arctocephalus gazella, in the South Shetland Archipelago. Since all censuses ... was developed for assessing uncertainties in the estimates of the counts (inter and intra-observer ... undertaking regional surveys of land-based predators in the future. Censuses developed at the SSSI have proved ... -1,74%CV, while inter-observer error was within 3% of the overall mean. The relationship between census ...
Meeting Document : WG-EMM-01/49 : Autor(es): R. Hucke-Gaete (Chile)
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Density and biomass of Antarctic krill around South Shetland Islands using by 2-dB difference method
the west of the South Shetland Islands. The mean length/height ratio of krill aggregations in the west ... aggregations in the Elephant Island peripheries and south of South Shetland Islands were higher than those in ... of the South Shetland Islands (64.5) was higher than that in the south (35.9) and the Elephant Island ... Antarctic krill (4.9 to 12.0 dB) and fish (-4.0 to-0.2 dB). The distributions and mean Sv of krill ...
Meeting Document : SG-ASAM-17/04 : Autor(es): S.-G. Choi, K. Lee and D. An
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A distribution-free model of length-frequency distribution to inform fishery stratification for integrated assessments
significantly influence the LFD helps in evaluating how to account for important differences in availability and ... /or gear specific selectivity. A distribution-free model of LFD is described which is fitted to the ... set of length quantiles L for a predetermined set of corresponding probabilities P (in this instance ... 0.05, 0.1 to 0.9 in 0.1 increments, and 0.95), constructed from individual length measurements of ...
Meeting Document : WG-SAM-13/18 : Autor(es): S. Candy, P. Ziegler and D. Welsford (Australia)
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Aggregation patterns of pelagic predators and their principal prey, Antarctic krill, near South Georgia
is an explicit consideration of the separation in space between swarms of krill and aggregations of ... Abstract: 1. We examine the spatial distributions of pelagic seabirds and. fur seals near South ... Georgia, and asked to what extent the distributions of these predators were influenced by the spatial ... survey of the waters surrounding Bird Island, South. Georgia. Predator abundance was estimated visually ...
Meeting Document : WG-CEMP-93/13 : Autor(es): R.R. Veit (USA), E.D. Silverman (USA) and I. Everson (United Kingdom)
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Long-distance movements of tagged Patagonian (Dissostichus eleginoides) and Antarctic toothfish (D. mawsoni)
to date the majority of tagged toothfish movements were very restricted in distance and requested ... Abstract: At WG-SAM-16, the Working Group discussed the implications of toothfish moving long ... distances after the Chilean research survey for Dissostichus spp. in Subarea 48.2 recaptured one tagged fish ... in 2016 that had been released in Subarea 48.6 in 2011 (WG-SAM-16/20). The Working Group noted that ...
Meeting Document : WG-FSA-16/25 Rev. 1 : Autor(es): CCAMLR Secretariat
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Comparison of NASC values calculated by swarm-based and grid-based acoustic data processing methods for Antarctic krill density estimation
Abstract: The one nautical mile integrated Nautical Area Scattering Coefficient (NASC) values of ... four surveys in 48.1 fishing area were calculated using both the swarm-based and conventional grid ... -based acoustic data processing methods. All parameter settings were consistent with the reports of SG ... -ASAM-2017 except that the dB difference window of Sv 120 kHz-Sv 38kHz is set 0 to 20 dB. And the two ...
Meeting Document : SG-ASAM-18/04 Rev. 1 : Autor(es): X. Yu, X. Wang and X. Zhao
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A comparison of model predictions from KPFM1 and KPFM2
seasonality into parameter estimates and a necessary change in the predator recruitment function of KPFM2 ... Abstract: We compare two versions of the krill-predator-fishery model to demonstrate the extent ... to which the predictions of KPFM1 can be reproduced with KPFM2. We also discuss the incorporation of ... . These comparisons provide a preliminary indication that the substantial changes in the structure and ...
Meeting Document : WG-EMM-06/20 : Autor(es): J. Hinke, G. Watters (USA), S. Hill and K. Reid (United Kingdom)