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Interactions of Patagonian toothfish fisheries with killer and sperm whales in the Crozet Islands Exclusive Economic Zone: an assessment of depredation levels and insights on possible mitigation strategies
Paper Title: Interactions of Patagonian toothfish fisheries with killer and sperm whales in the ... mitigation strategies Abstract / Description: Within the Crozet Islands Exclusive Economic Zone (EEZ), the ... , killer whales alone, and the two species co-occurring were observed on 32.6%, 18.6% and 23.4 ... % respectively of the 4 289 hauled lines. It was estimated that a total of 571 tonnes (€4.8 million) of ... by killer whales The depth at which the lines were set had no sig- nificant effect on the CPUE both ... < 0.001), but no interac- tion effect between the vessel identity and the other two variables was found ... this case, there was no effect of the length of the line on CPUE. Indeed, the latter remained low for ... were no additional benefits to vessels of travelling distances greater than 40–60 n miles. The data ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 179–195 : Autor(es): Tixier, P., N. Gasco, G. Duhamel, M. Viviant, M. Authier and C. Guinet
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Homogeneity of body length composition of Antarctic krill within the commercial zone
Paper Title: Homogeneity of body length composition of Antarctic krill within the commercial zone ... Abstract / Description: The homogeneity of krill (Euphausia superba) length composition in commercial ... trawl catches (hauls) was investigated by comparing length compositions from different parts of the same ... haul. There was no significant difference (P >0.5) in 53 out of 60 hauls. Therefore it is concluded ... length compositions from different parts of the same haul. There was no significant difference (P>O.OS ... board FV Zuiyo Maru No. 2 (3023 tonnes, Hakodate Kokai Gyogyo Co.) off George V Land in the 1985/86 ... -haul length compositions were compared by testing the null hypothesis
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 17–28 : Autor(es): Ichii, T.
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Indices of prey availability near the Seal Island CEMP site: 1990 to 1996
Paper Title: Indices of prey availability near the Seal Island CEMP site: 1990 to 1996 Abstract ... Seal Island CEMP site during the austral summers of 1990 to 1996. The indices are measures of average ... / Description: Four indices of prey availability are calculated from surveys conducted in the vicinity of the ... surveys each year were subsampled to include the foraging range of predators breeding at Seal Island ... . Blank cells indicate that no data are available. RESULTS AND DISCUSSION Values of the four indices ... AVAILABILITY NEAR THE SEAL ISLAND CEMP SITE: 1990 TO 1996 R.P. Hewitt, G. Watters and D.A. Demer Southwest ... availability are calculated from surveys conducted in the vicinity of the Seal Island CEMP site during the ... decibels. Hewitt et al. Table 2: Annual indices of prey availability near the Seal Island CEMP site ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 37–45 : Autor(es): Hewitt, R.P., G. Watters and D.A. Demer
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On the intensity of sampling krill trawl catches
Paper Title: On the intensity of sampling krill trawl catches Abstract / Description: This paper ... uses actual krill length-frequency data in an attempt to address the problem of the determination of ... . The possible effect of two other factors (within-trawl variability and sample decomposition) which may ... influence length-frequency data quality is also considered. Attention is drawn to the following: • all ... were no significant differences (F=8.75, a=O.lO to 0.05) between mean lengths or the number of animals ... Figure 7. Results from the ANOV A (F=0.31, a=O.lO to 0.05) indicate no significant changes in mean ... , Australia: CCAMLR. p. 10. MILLER, D.G.M 1987. The South African SIBEX II cruise to the Prydz Bay region. S ... WG-KRILL-90/27 ON THE INTENSITY OF SAMPLING KRILL TRAWL ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 29–48 : Autor(es): Miller, D.G.M.
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Refinements to the strategy for managing depleted fish stocks based on CCAMLR objectives
Paper Title: Refinements to the strategy for managing depleted fish stocks based on CCAMLR ... decades is illustrated. These fishing mortalities are based on probabilistic descriptions of the future ... hence that additional management policies are required for depleted stocks. The implications of these ... studies for defining the terms 'depleted' and 'target levels for recovery' are briefly ... using the biomass from a deterministic projection (Le., no recruitment fluctuation) of the median of ... SC-CAMLR-BG-IX/BG/14 REFINEMENTS TO THE STRATEGY FOR ... fishing mortalities are based on probabilistic descriptions of the future states of a depleted stock ... management policies are required for depleted stocks. The implications of these studies for defining the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 467–475 : Autor(es): de la Mare, W.K. and A. Constable
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Revised research plan for the 2016/17 exploratory longline fishery of Dissostichus spp. in Subarea 48.6 by South Africa and Japan
Abstract: South Africa and Japan have revised the next season’s (2016/17) research plan in ... Subarea 48.6 using the latest CCAMLR C2 and Observer data, following several advices during WG-SAM meeting ... in 2016. We have used extracted data provided by CCAMLR Secretariat in this late August for the ... current analysis, but not used the cleaning data provided by them in this early September due to tight ...
Meeting Document : WG-FSA-16/32 Rev. 1 : Autor(es): Delegations of Japan and South Africa
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Guidelines for the preparation of hydroacoustic survey reports on krill
Paper Title: Guidelines for the preparation of hydroacoustic survey reports on krill Abstract ... / Description: The proposed guidelines provide an opportunity to perform comparative analyses and checks of ... surveys. The unification of echometric survey data is aimed at increasing the effectiveness of research on ... the quantitative assessment of biomass of organisms. The guidelines contain a description of ... - 165 - SC-CAMLR-V/BG/37 GUIDELINES FOR THE ... PREPARATION OF HYDROACOUSTIC SURVEY REPORTS ON KRILL I.L.Kalikhman (U.S.S.R.) Abstract The proposed ... echometric surveys of fish and krill, and to establish a data bank of these surveys. The unification of ... echometric survey data is aimed at increasing the effectiveness of research on the· quantitative assessment ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 165-193 : Autor(es): Kalikhman, I.L.
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Analyses of acoustic line-transect data from the waters around South Georgia: estimation of krill (Euphausia superba Dana) – biomass
Paper Title: Analyses of acoustic line-transect data from the waters around South Georgia ... of zooplankton stocks in the waters around South Georgia was carried out during November and December ... 1981. The data have been analysed using various definitions of strata. The total biomass in the area of ... estimate of mean density throughout the region of 11.7 tonnes km-2. Although the estimate of the mean is ... South Georgia (Figure 1). There was no information available at the planning stage to produce a ... assuming no local production then a crude estimate of input rate may be calculated. Assuming the standing ... ). Transects are taken as the basic sample unit. Stratum No. of Density Variance Area Biomass Observations ... FROM THE WATERS AROUND SOUTH GEORGIA: ESTIMATION OF KRILL (EUPHAUSIA SUPERBA DANA) - BIOMASS E ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 225–243 : Autor(es): Murphy, E., I. Everson and A. Murray
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Estimation of natural mortality using catch-at-age and aged mark-recapture data: a multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation.
selectivity function, the bias and imprecision in estimates of M increased by no more than 2% for the CCODE ... model with no increase detectable for the BODE model. With these caveats, both models can be used to ... multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a ... number of recaptures-at-age and model the population numbersat- age by annual difference equations ... selectivity function, the bias and imprecision in estimates of M increased by no more than 2% for the CCODE ... model with no increase detectable for the BODE model. With these caveats, both models can be used to ... advantage that there is no need for a catch equation since Ct,a, the absolute fishing mortality in equa ... CCODE model there is no cor- responding likelihood component for catch-at-age numbers since the actual ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Autor(es): Candy, S.G.
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Standardization of fishing effort for Champsocephalus gunnari in the South Georgia area (Subarea 48.3)
Paper Title: Standardization of fishing effort for Champsocephalus gunnari in the South Georgia ... inflexible in its use of data types and has no estimate of accuracy. A standardized CPUE index for ... to solve the model and the resultant yearly standardized CPUE shows the same trends independent of ... the values selected to standardize the model. The mean coefficient of variation for the CPUE values ... CHAMPSOCEPHALUS GUNNARI IN THE SOUTH GEORGIA AREA (SUB AREA 48.3) P.S. Gasiukov* Abstract Traditional ... calculation of catch-per-unit-effort series is inflexible in its use of data types and has no estimate of ... gear, months and years). Multiple regression is used to solve the model and the resultant yearly ... standardized CPUE shows the same trends independent of the values selected to standardize the model. The mean ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 327–336 : Autor(es): Gasiukov, P.S.