Résultats de la recherche
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A generalised model for evaluating yield and the long-term status of fish stocks under conditions of uncertainty
Paper Title: A generalised model for evaluating yield and the long-term status of fish stocks ... projection model for assessing the long-term annual yield which satisfies objectives for the maintenance of ... the spawning stock biomass in accordance with CCAMLR criteria. These specify a bound on the ... period and set a further constraint on the long-term status of the stock relative to the pre-exploitation ... mean 2 and variance G ~ . In the simplest case, recruitment is considered to be independent of ... the reproductive performance of the stock was not jeopardised (SC-CAMLR, 1987). In addition, this ... Antarctic marine living resources in terms of their abundance relative to the pre-exploitation abundance ... up the number of fish in each age class at the start of the simulation period. Each age class is ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 31–54 : Auteur(s): Constable, A. and W.K. de la Mare
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Analysis of sea-ice concentration of 48.6_4 and _5 with remote sensing data during the latest four seasons
to enter the block, thus she left for the northern part of Subarea 48.6 in February 8th. However, the ... sea-ice disappeared in the eastern part of the block in February 21st after she left. The sea-ice was ... becoming thick around whole block in March 11th, but disappeared in the eastern part of the block again in ... the opportunity to go into the block even though there were apparently free of ice for some part in ...
Meeting Document : WG-SAM-16/42 Rev. 1 : Auteur(s): T. Namba, K. Taki and T. Ichii
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Joint Polish/American hydroacoustic survey of Elephant Island and the vicinity of King George Island, 1988
in most areas covered by last year’s survey. The total biomass in the vicinity of Elephant Island was ... estimated from 120 kHz data to be 260k tonnes and that in the Bransfield Strait south of King George Island ... was 39k tonnes for a total of 299k tonnes in the combined areas. The estimated 200 kHz survey data ... area north of King George Island and 309k tonnes (in 8 836 n m 2) in the expanded area around Elephant ... ; T is echo integrator deflection for 1 n mile segment (in n miles). The mean abundance of krill per ... - 95.7 (db) 1.2 where L is the length of krill in mm. Mean surface density or abundance (tonnes/nm2 ... abundance of biomass; w is the mean weight of krill (in g) and is mean density of krill from 1.1 above mean ... in the vicinity of Elephant Island was estimated from 120 kHz data to be 260k tonnes and that in ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 357–377 : Auteur(s): Macaulay, M.C.
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Towards the development of an assessment of stock abundance for Subarea 88.2 SSRUs 88.2C–G
fish have been recaptured. It is likely that the lack of recaptures of tagged fish in this region has ... effort. By drawing on the success of tagging programmes in other CCAMLR fisheries, we develop an approach ... these fishing grounds as a condition of fishing in the slope region (SSRUs 88.2C–G). This condition ... least 3 tags per tonne in the short term. In addition to improving estimates of abundance a higher ...
Meeting Document : WG-FSA-14/59 : Auteur(s): S.M. Hanchet and S.J. Parker (New Zealand)
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A comparison of acoustic targets at South Georgia and the South Orkney Islands during a season of profound krill scarcity
Abstract: Dual frequency (38 and 120 kHz) acoustic surveys of shelf-break regions in the vicinity ... of Willis Islands, South Georgia and Coronation Island, South Orkneys, both in the Atlantic sector of ... signals. The water column in the vicinity of Willis Islands was characterised by a series of diffuse but ... approximate six-fold difference in mean krill abundance was detected between the two areas, but in comparison ...
Meeting Document : WG-EMM-95/75 : Auteur(s): Watkins, J.L., Brierley, A.S.
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COMPARATIVE CHARACTERISTICS OF PATAGONIAN (DISSOSTICHUS ELEGINOIDES) AND ANTARCTIC (D. MAWSONI NORMAN) TOOTHFISH INHABITING DIFFERENT SECTORS OF THE SOUTHERN OCEAN
of these parameters revealed essential differences in food spectra both at the first pelagic stage of ... larger on the average than in the area of Kerguelen Archipelago (58.5.1.) (Posters 1 and 2). In turn ... , Antarctic toothfish individuals in the seas of Indian Sector (58.4) are larger than in the Pacific Ross Sea ... shelf and slope of continental seas in the Indian Sector of Antarctica. Author(s): K.V. Shust, I.P ...
Meeting Document : WG-FSA-09/24 : Auteur(s): K.V. Shust, I.P. Zarikhin, I.G. Istomin, A.F. Petrov, V.A. Tatarnikov and N.S. Demina (Russia)
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Proposal of the Russian Federation to open Subarea 88.3 for exploratory fishery of Dissostichus spp.
. Collected in research fishing data contributes to the achievement of the main objectives of research for the ... of hypotheses about the ratio of fish in the area and the total stock as well as studying of ... calculated by the accepted in SC-CCAMLR-XXX/5 p.2.40 (ii) formula. Value of toothfish`s stock by SSRUs and ... all details of stock assessment methods are described in the present work. Author(s): Delegation of ...
Meeting Document : WG-FSA-13/12 : Auteur(s): Delegation of the Russian Federation
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Analysis of krill trawling positions north of the South Shetland Islands (Antarctic Peninsula area), 1980/81–1999/2000
commercial krill trawling positions for the 1980/81 to 1999/2000 seasons in the area north of the South ... at the beginning of fishing operations each season. In summer, biological factors that affect product ... Paper Title: Analysis of krill trawling positions north of the South Shetland Islands (Antarctic ... operations concentrated on the outer shelf in the early 1980s, along the shelf slope in the mid to late 1980s ... to the small number of data points (<5). In December the mean STP was positively correlated with ... in the 1990/91 and 1994/95 seasons (Table 1). Interestingly, the monthly variation of mean STP for ... of commercial krill trawling positions for the 1980/81 to 1999/2000 seasons in the area north of the ... in the season. Trawling positions seemed to be primarily governed by the distribution of larger ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 25–36 : Auteur(s): Kawaguchi, S. and K. Segawa
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Homogeneity of body length composition of Antarctic krill within the commercial zone
Abstract / Description: The homogeneity of krill (Euphausia superba) length composition in commercial ... that sampling from one part of the haul provides a reasonable estimate of length composition in the ... Paper Title: Homogeneity of body length composition of Antarctic krill within the commercial zone ... trawl catches (hauls) was investigated by comparing length compositions from different parts of the same ... . Nocturnal changes in the mean length of a euphausiid population: vertical migration, net avoidance, or ... ) in 53 out of 60 hauls. Therefore it is concluded that sampling from one part of the haul provides a ... reasonable estimate of length composition in the entire haul. In contrast to small variations in length ... different parts of the haul as possible in order to obtain an unbiased estimate of the catch length ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 17–28 : Auteur(s): Ichii, T.
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Reassessment of important population parameters for Dissostichus eleginoides on the Heard Island Plateau (Division 58.5.2) based on time series of surveys and fishery data
parameters and recruitment of Patagonian toothfish, Dissostichus eleginoides, in the Heard Island region. A ... new survey of the Heard Island Plateau was undertaken in May- June 2001, providing the sixth survey ... -estimated in the past. An estimate of natural mortality indicates that mortality of young fish, ages 3-8 ... , may be much greater than older fish. This may need to be taken account of in the assessment process ...
Meeting Document : WG-FSA-01/73 : Auteur(s): A.J. Constable, R. Williams, T. Lamb, I.R. Ball and E. van Wijk (Australia)