Resultados de la búsqueda
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Depletion-based stock reduction analysis: a catch-based method for determining sustainable yields for data-poor fish stocks
for data-poor fisheries in cases where approximate catches are known from the beginning of ... exploitation. The method, called Depletion-Based Stock Reduction Analysis (DB-SRA), merges stochastic Stock ... specified based on general fishery knowledge of the relative location of maximum productivity and the ... relationship of MSY fishing rate to the natural mortality rate. This leaves unfished biomass as the only ...
Meeting Document : WG-SAM-11/P2 : Autor(es): E.J. Dick and A.D. McCall
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric parameter?
males and females, and these often overlap. Whilst discriminant analysis can be used to determine the ... normal distributions are used to show that there is a difference between the real mean parameter for a ... sex, and the apparent mean derived by sexing the birds using discriminant analysis. When discriminant ... functions are able to correctly determine the sex of birds with greater than 80% success the difference ...
Meeting Document : WG-CEMP-92/11 : Autor(es): D.J. Agnew (Secretariat)
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Survey estimates of recruitment of toothfish in Subarea 48.3
data used by the Working Group for toothfish assessments in 1999 and later were correct. We found ... , the modal progression of peaks in the length densities corresponding to cohorts assessed by sequential ... surveys. Length based analysis of these confirms the growth rate expected from the CCAMLR growth equation ... for South Georgia. Although it is easy to spot cohorts, the size of individual cohorts can not be ...
Meeting Document : WG-FSA-SAM-04/16 : Autor(es): Collins, M., Wakeford, R.C., Moir-Clark, J., Belchier, M., Agnew, D.J.
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Research plan for exploratory fishing for toothfish (Dissostichus spp.) in 2015/16 in Division 58.4.1
with the other participants over the coming years in order to participate in the tagging program and ... achieve a robust stock assessment. The aim is to collect sufficient data to provide an advice on a catch ... /2016 developed under Conservation Measure 41-01. The biomass in the Division was estimated by research ... block during WG-FSA 2014 using CPUE x seabed analogy method. In the absence of an assessment using the ...
Meeting Document : WG-SAM-15/16 : Autor(es): Delegation of France
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Long-distance movements of tagged Patagonian (Dissostichus eleginoides) and Antarctic toothfish (D. mawsoni)
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 ... to date the majority of tagged toothfish movements were very restricted in distance and requested ...
Meeting Document : WG-FSA-16/25 Rev. 1 : Autor(es): CCAMLR Secretariat
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Describing krill: swarms or integration intervals?
, rather than the current integration grid approach, may facilitate the semi-automated processing of ... estimated mean areal krill density for a small (65 km by 60 km) survey conducted in the waters off Mawson ... research station in the East Antarctic (66 o 25' S 63 o 14' E). I found 61 % overlap between the ... variance estimates for conventional grid-based swarm-based krill density. The processing time of the swarm ...
Meeting Document : SG-ASAM-17/02 : Autor(es): M.J. Cox
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Simulating performance of trend analysis for setting catch limits in exploratory toothfish research plans
Abstract: Catch limits for toothfish in research blocks were set for the 2017/18 season using a ... rules developed by WG-FSA-17. The Scientific Committee recommended that the approach be further ... developed and tested as a matter of priority for WG-SAM-18. We formalised and codified the rules and ... developed a simulation approach to examine the performance of the trend analysis rules for scenarios with ...
Meeting Document : WG-SAM-18/23 : Autor(es): S. Hoyle, S. Parker, A. Dunn and S. Mormede
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CCAMLR research and exploratory fishing: commercial fishing disguised as scientific research
exploratory fishing conservation measures are not meeting the objectives of the Convention. Research and ... exploratory fishing activities are not increasing our understanding of the fished species and its impact on ... the ecosystem, putting the future of Antarctic marine living resources at risk. The Second Performance ... Review and several Scientific Committee working groups have raised concerns regarding the current ...
Meeting Document : SC-CAMLR-XXXVII/BG/28 : Autor(es): Submitted by ASOC
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Fishing gear, marine debris and oil associated with seabirds at Bird Island, South Georgia, 2001/02
associated with seabirds at Bird Island, South Georgia during the period 1 April 2001 to 31 March 2002. It is ... the ninth such annual report. Fewer hooks and other longline fishery discards were recorded in ... association with wandering albatrosses compared to last year, but the number of items (63) remains well above ... the mean since annual recording began. The number of items of fishing gear associated with grey-headed ...
Meeting Document : SC-CAMLR-XXI/BG/07 : Autor(es): Delegation of the United Kingdom
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Sexual dimorphism and sexual segregation in foraging strategies of northern giant petrels Macronectes halli during incubation
Abstract: Giant petrels (Macronectes spp) are the most sexually dimorphic of all seabirds. We ... used satellite-tracking and mass change during incubation to investigate the influence of sexual size ... dimorphism, in terms of the intersexual food competition hypothesis, on foraging and fasting strategies of ... northern giant petrels at South Georgia. Females foraged at sea whereas males foraged mainly on the South ...
Meeting Document : WG-FSA-99/38 : Autor(es): J. González-Solís, J.P. Croxall and A.G. Wood (United Kingdom)