Résultats de la recherche
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A simulation study of the method of refining the natural mortality coefficient with Champsocephalus gunnari in Subarea 48.3 used as an example
Abstract: The method of refining the natural mortality coefficient is based on the notion that ... mortality as defined by the VPA and fishing effort must be equal to zero if the natural mortality ... shown that the proposed method facilitates such a refinement. When a mistake is made in the choice of ... natural mortality coefficient, the estimate of the free component in the equation will be other than zero ...
Meeting Document : WG-FSA-91/25 : Auteur(s): P.S. Gasiukov and R.S. Dorovskikh (USSR)
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Measurements of fish school velocities with an acoustic Doppler current profiler
results suggests that the ADCP can be a useful tool for observing fish behavior in certain situations ... ), it was required that the four ADCP beams simultaneously insonified a fish school, in the same depth ... scattering layers and possibly vessel avoidance reaction. The method can be enhanced by utilizing the radial ... : Measurements of fish school velocities with an acoustic Doppler current profiler Approval: Approved ...
Meeting Document : WG-EMM-96/41 : Auteur(s): Demer, D.A.
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INTERACTIONS OF PATAGONIAN TOOTHFISH FISHERIES WITH KILLER AND SPERM WHALES IN CROZET EXCLUSIVE ECONOMIC ZONE: AN ASSESSMENT OF DEPREDATION LEVELS AND INSIGHTS ON POSSIBLE MITIGATION SOLUTIONS
data revealed that among the 97 killer whales interacting with the fishery, however 35 individuals ... represents a financial loss of approximately 10 millions €. Killer whales were found to be responsible for ... belonging to four different pods were involved in 81.3% of the interaction events. We also estimated that a ... total of 64 sperm whales interacted with the fishery on the Crozet EEZ in 2008. Significant variations ...
Meeting Document : WG-IMAF-09/12 : Auteur(s): P. Tixier, N. Gasco, G. Duhamel and C. Guinet (France)
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Seabird interactions with trawl and longline fisheries for Dissostichus eleginoides and Champsocephalus gunnari
Paper Title: Seabird interactions with trawl and longline fisheries for Dissostichus eleginoides ... was zero at Macquarie Island and very low at Kerguelen; most was associated with a single vessel using ... a netsonde cable while targetting C. gunnari. Most mortality associated with both longliners and ... trawlers was of white-chinned petrels, with a lesser mortality of albatross species. Mortality rates ... found in the bag of the net could be either collision with t h i netsonde cable or diving into the ... Duhamel (1991). This difference could be connected with the more active searching for food by the birds ... ship's wake and be left behind by the ship. The above behaviour meant that birds rarely came closer ... be injured or killed by collision with the cable and fall in the water, ending up in the net. The ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 93–99 : Auteur(s): Williams, R. and D. Capdeville
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Seabird interaction with long-lining operations for Dissostichus eleginoides around South Georgia, April and May 1994
incidental mortality and interactions with seabirds. Twenty-seven lines were observed and ninety-eight ... contributed 85% of overall mortality, with giant petrels, grey-headed albatrosses and black-browed albatrosses ... predominating. Our data suggest that grey-headed albatrosses, whose populations at South Georgia are in serious ... vessel; giant petrels also may be disproportionately affected, at least in relation to the size of their ...
Meeting Document : WG-IMALF-94/15 : Auteur(s): J.R. Ashford, J.P. Croxall (United Kingdom), P.S. Rubilar and C.A. Moreno (Chile)
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A proposed process for the management of model updates and software versions for stock assessment used within CCAMLR with the example of the CASAL software
stock assessments in CCAMLR, with the specific example of the CASAL software used for stock assessment ... . The latest published version of any stock assessment software approved by CCAMLR should be used by ... author to demonstrate that the latest development version performs as expected. As an example, the latest ... published version of CASAL should be used by default for stock assessments unless particular features ...
Meeting Document : WG-SAM-14/32 : Auteur(s): S. Mormede and A. Dunn (New Zealand)
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Integrating CPUE with the GY model: examination of the effects of shortening the CPUE series and incorporating elements of uncertainty into the D. eleginoides assessment of Subarea 48.3
Abstract: This year the Subgroup on assessment methods (SAM) requested that WG-FSA consider ... whether a shorter CPUE time-series would be preferable for use in its annual assessments. (WG-FSA-03/40 ... ) shows a more pronounced consequence of reducing the time series, such that the escapement level ... that truncation of the CPUE series could have a much greater effect on the final assessment, depending ...
Meeting Document : WG-FSA-03/96 : Auteur(s): I.R. Ball, S. Candy and A.J. Constable (Australia)
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Variation in echosounder calibration with temperature and some possible implications for acoustic surveys of krill biomass
results from multiple Antarctic and European calibration events which suggest that echo-sounder transducer ... calibration parameters were to be employed on survey around South Georgia, and no account were taken of the ... differences in gain settings, then integrated 120 kHz echo signals would be under-reported by 2.8 dB, leading ... in turn to an under-estimation of krill biomass by 52.5 %. Every effort should therefore be made to ...
Meeting Document : WG-EMM-97/52 : Auteur(s): Watkins, J.L., Woodroffe, P., Brierley, A.S., Goss, C.
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Estimates of krill biomass with commercial significance in small-scale management units applying geostatistics techniques
differences between commercial biomass can be obtained for areas with the comparable total biomass, e.g. total ... ”, considered for allocating this catch limit among the SSMUs in the Scotia Sea, has to be supplemented with the ... 0.18 and 0.40, and in SGW- 0.06 and 0.24 respectively. The survey 2002 indicated that the significant ... will be related to the problem of acoustic data processing improvement. The methods specially ...
Meeting Document : WG-EMM-06/36 : Auteur(s): S.M. Kasatkina and P.S. Gasyukov (Russia)
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Is toothfish catch correlated with the catch of vulnerable benthic invertebrate taxa?
fishing would be higher than if VMEs are distributed randomly with respect to fishing locations. This ... footprint. If high target fish catch rates are associated with habitats where VMEs are found, impacts from ... evidence that the presence of any of six VME taxa was related to Antarctic toothfish catch at the scale of ... scales (10–100 km) would be useful to determine if both toothfish and individual VME taxa have regionally ...
Meeting Document : WG-EMM-10/27 : Auteur(s): S.J. Parker and M.H. Smith (New Zealand)