Search results
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Modelling Southern Ocean krill population dynamics: biological processes generating fluctuations in the South Georgia ecosystem
. Low krill abundance was associated with reduced representation of the 3+ age group, whereas when krill ... were abundant the 3+ age class was the major age group present. The seasonal changes in the population ... . The dominance of the changes in krill population age structure underlines the fact that to understand ... . Low krill abundance was associated with reduced representation of the 3+ age group, whereas when krill ...
Meeting Document : WG-EMM-01/53 : Author(s): E. Murphy and K. Reid (United Kingdom)
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Catch per unit effort and proportional recruitment indices from Japanese krill fishery data in Subarea 48.1
is the number of animals in age class i, and n is the age of the oldest age class in the stock (de la Mare ... /89. From 1989/90 to 1991/92, almost no age 2+ components were identified. In 1992/93 and 1993/94 ... ). Proportional recruits (R2) were calculated based on numbers of age 2+ krill identified by MIX analysis. R2 ... is the ratio of numbers of age 2+ krill to numbers of age 2+ and older krill combined. That is: where Ai ... period. The use of different fishing strategies in response to a demand for higher product quality and a ... general decrease in krill density in the study area were considered as possible reasons for this. On the ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 47–63 : Author(s): Kawaguchi, S., T. Ichii and M. Naganobu
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Recommendation for an explicit limit reference point for the mackerel icefish (Champsocephalus gunnari) fishery in CCAMLR Statistical Division 58.5.2
completed. In years with a zero commercial catch limit, a combined bycatch and research catch limit of 30 ... limit recommended by the decision rules is below 100 tonnes in the first year after a survey has been ... by the decision rules is below 100 tonnes in the first year after a survey has been completed. In years ... with a zero commercial catch limit, a combined bycatch and research catch limit of 30 tonnes would allow ...
Meeting Document : WG-FSA-11/34 : Author(s): Delegation of Australia
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Proposal for an extension to the mark-recapture experiment to estimate toothfish population size in the South of Subarea 48.4
Abstract: A three‐year tagging study in the South of Subarea 48.4 was initiated in the 2008/09 ... of 238 Amblyraja georgiana were tagged and released in 2010 and 3 were recaptured; Approximately 20 ... experiment in the South of Subarea 48.4 in 2010/11 with a reduced TAC of 30 tonnes. Author(s): J. Roberts ... A three‐year tagging study in the South of Subarea 48.4 was initiated in the 2008/09 fishing season ...
Meeting Document : WG-FSA-10/40 : Author(s): J. Roberts and D. Agnew (UK)
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Fishery Report: Dissostichus eleginoides Subarea 48.4
. Fishing is limited to the area between latitudes 55°30'S and 57°20'S and longitudes 25°30'W and 29°30 ... only. Fishing limited to area bounded by latitudes 55°30'S and 57°20'S and by longitudes 25°30 ... for D. eleginoides to 100 tonnes per season and a revised fishing season (1 April to 30 September) to allow each ... 56 55 S 57 58 30 29 28 27W Subarea 48.4 2526 Figure 1: General map of Subarea 48.4 ...
Document : Site Section: Publications
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Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia
age structure and growth parameters are used. It is concluded that only in the three earliest years ... the period prior to large scale commercial harvesting is discussed. Methods based on population age structure ... and growth parameters are used. It is concluded that only in the three earliest years, 195 1, 1964 and 1966 ...
Meeting Document : WG-FSA-97/05 : Author(s): Everson, I.
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Principles for evaluating data collection plans in data-poor exploratory fisheries
with the principles set forth in Article II of the Convention. However, several times over the last five years ... in accordance with the principles set forth in Article II of the Convention. However, several times over ... the last five years the Scientific Committee has noted with concern the lack of progress in developing ... robust assessments of status of Dissostichus spp. in exploratory fisheries. Each additional year ...
Meeting Document : WG-SAM-11/08 : Author(s): P.E. Ziegler, D.C. Welsford and A.J. Constable (Australia)
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KRILL FISHERY BEHAVIOUR IN THE SOUTHWEST ATLANTIC
Abstract: 10 years worth of recent finescale haul-by haul krill data were used to characterize ... through the analysis was 15-30 tonnes/haul, which is higher than the 1980s information (5-10 tonne/haul ... tows were 10-15 nm, which is the scale of a single concentration. However, there was considerable year ... to year variability in the probabilities of operating within a local range after a number of tows ...
Meeting Document : WG-EMM-08/39 : Author(s): S. Kawaguchi (Australia)
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Towards an ecological risk assessment of krill fishing in East Antarctica (CCAMLR Divisions 58.4.1 and 58.4.2)
the Working Group review this work, prioritise data sets and further analyses, and consider a process to allow ... Word File: emm-17-20.docx Approval: Approved Secretariat Workflow Status: Content Approved ... the Working Group review this work, prioritise data sets and further analyses, and consider a process to allow ...
Meeting Document : WG-EMM-17/20 : Author(s): N. Kelly, M. Cox, L. Emmerson, S. Kawaguchi, B. Raymond, C. Southwell and D. Welsford
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Fishery Report 2013: Dissostichus eleginoides Kerguelen Islands (Division 58.5.1)
as well as collection of otoliths for age determination of the target and most frequently taken by-catch ... ’ for Dissostichus spp.) are shaded. Throughout this report the CCAMLR fishing season is represented by the year ... to 30 November 2013). FISHERY REPORT 2013: DISSOSTICHUS ELEGINOIDES KERGUELEN ISLANDS ... fishery began in 1992 and continues to the present. The fishery is active throughout the year ...
Document : Site Section: Publications