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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.
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An assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank (CCAMLR Division 58.4.3b) based on fine-scale catch and effort data
Paper Title: An assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank ... (CCAMLR Division 58.4.3b) based on fine-scale catch and effort data Abstract / Description: In 2006, the ... CCAMLR Scientific Committee expressed concern as to the status of the stock on which the exploratory ... biological data submitted by scientific observers on board vessels in the fishery. Results of a Leslie ... effort in the fishery. Given the short period fished by vessels in each season (December to March), no ... data recorded for total catch weight, 21 had no data recorded for total number of fish caught, and the ... remainder had no soak time recorded. Of the latter, recorded longline set and haul times could not rea ... captured no D. elegi- noides. While clearly D. mawsoni has proved the pri- mary species captured by the ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 55–78 : Autor(es): McKinlay, J.P., D.C. Welsford, A.J. Constable and G.B. Nowara
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Modelling and decision making as part of the CCAMLR management regime
Paper Title: Modelling and decision making as part of the CCAMLR management regime Abstract ... / Description: This paper outlines a stylised scheme designed to address the multi-objective decision ... environment essential for the effective management of the Antarctic marine ecosystem within the requirements ... horizons, time steps, constraints and data) were identified in an attempt to provide a blueprint for the ... the Antarctic marine ecosystem, it appears inevitable that no single model will be flexible enough ... present no coherent management plan has yet been formulated for the system briefly outlined above ... population, there is no real need to have both predators and prey as variables in the model - prey ... AS PART OF THE CCAMLR MANAGEMENT REGIME D.G.M. Miller (South Africa) Abstract This paper ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 295-322 : Autor(es): Miller, D.G.M.
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Analysis of haul data from the South Georgia krill fishery
Paper Title: Analysis of haul data from the South Georgia krill fishery Abstract / Description ... : Data from individual hauls carried out by vessels operating in the South Georgia krill fishery between ... 1994 and 1996 were examined and a range of descriptive measurements reflecting the fishery operation ... were produced. The measurements emphasise that the krill fishery at South Georgia was geographically ... DATA FROM THE SOUTH GEORGIA KRILL FISHERY P.N. Trathan, I. Everson and E.J. Murphy British Antarctic ... out by vessels operating in the South Georgia krill fishery between 1994 and 1996 were examined and a ... range of descriptive measurements reflecting the fishery operation were produced. The measurements ... emphasise that the krill fishery at South Georgia was geographically focused, operating in a limited area ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 9–30 : Autor(es): Trathan, P.N., I. Everson, E.J. Murphy and G.B. Parkes
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Comparative feeding ecology of Patagonian toothfish (Dissostichus eleginoides) in the southwestern Atlantic
the southwestern Atlantic Abstract / Description: The diet of Patagonian toothfish (Dissostichus ... eleginoides) was investigated in two offshore regions in the southwestern Atlantic: on the Argentinian ... °-45°W. The South Georgia area was divided into two zones: the shelf zone and deep-water zone. On the ... Argentinian continental shelf/slope, the length of D. eleginoides ranged from 30 to 95 cm total length (TL ... that D. eleginoides is an opportunistic feeder. We found no significant differences in the diet and ... FEEDING ECOLOGY OF PATAGONIAN TOOTHFISH (DISSOSTICHUS ELEGINOIDES) IN THE SOUTHWESTERN ATLANTIC S.B ... Plata, Argentina Abstract The diet of Patagonian tootl~fish (Dissosfich~~s clegit~oides) was ... investigated in two offshore regions in the southwestern Atlantic: on the Argentinian continental shelf/slope ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 105–124 : Autor(es): García de la Rosa, S.B., F. Sánchez and D. Figueroa
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Biomass, abundance and distribution of fish in the Kerguelen Islands EEZ (CCAMLR Statistical Division 58.5.1)
Paper Title: Biomass, abundance and distribution of fish in the Kerguelen Islands EEZ (CCAMLR ... conducted from September to October 2006 in the northern part of the Kerguelen Plateau (CCAMLR Statistical ... Division 58.5.1). The swept-area method was used in the depth range from 100 to 1 000 m with 207 random ... stratified stations. Estimates of biomass and abundance were produced for eight commercial species. The total ... , no real changes in the fishery meth- ods appeared and the catches of the target species drastically ... ) but, with no recent surveys avail- able, the urgent need to produce new estimates to improve the ... considerable amount of time since the previous survey (1987/88), no exist- ing data on fish species ... of these hauls were nevertheless used in the analysis because no major problems occurred (no net ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 1–32 : Autor(es): Duhamel, G. and M. Hautecoeur
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Biology and harvesting of Dissostichus eleginoides around the Kerguelen Islands (Division 58.5.1)
Paper Title: Biology and harvesting of Dissostichus eleginoides around the Kerguelen Islands ... species in the fisheries of the Southern Ocean. In Division 58.5.1, a directed trawl fishery has been in ... operation since 1984/85 and has expanded in the deep western sector of the Kerguelen Shelf. This fishery ... harvests the sub-adult/adult part of the stock. Fishing effort and corresponding catches are very variable ... is becoming an increasingly important species in the fisheries of the Southern Ocean. In Division ... 58.5.1, a directed trawl fishery has been in operation since 1984/85 and has expanded in the deep ... western sector of the Kerguelen Shelf. This fishery harvests the sub-adult/adult part of the stock ... . Fishing effort and corresponding catches are very variable from year to year and highly dependent on the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 85–106 : Autor(es): Duhamel, G.
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Foraging behaviour and reproductive success in chinstrap penguins: the effects of transmitter attachment
may be no difference between trip durations obtained by applying the transmitters to one or both ... Paper Title: Foraging behaviour and reproductive success in chinstrap penguins: the effects of ... transmitter attachment Abstract / Description: The use of radio telemetry has been accepted as a standard ... method with which to monitor foraging trip duration in penguins by the CCAMLR (Commission for the ... cm2 front section area), there may be no difference between trip durations obtained by applying the ... ) at the beginning of the observation period were used as a control group. No transmitters were ... recorded as the first day that a nest was observed with no chicks. A failure date of 13 January 294 ... between the three groups within each period revealed that there was no significant effect of transmitters ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 291–303 : Autor(es): Croll, D.A., J.L. Bengtson, P.L. Boveng, M.E. Goebel and J.K. Jansen