Résultats de la recherche
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Spatially explicit population dynamics models for Antarctic toothfish in the Ross Sea region
Paper Title: Spatially explicit population dynamics models for Antarctic toothfish in the Ross ... models were developed for the Antarctic toothfish (Dissostichus mawsoni) population in the Ross Sea ... . Movement was parameterised using preference functions based on spatially discrete environmental layers. The ... of the current single-area stock assessment. Simulations based on the three spatial distribution ... to fitting them in the model) were assumed at an effective sample size of 30 for catch-at-age ... year from fisheries data for the years 1998– 2011. The maximum exploitation rate was assumed to be ... –length key described above. The choice of 1% for mature and 2.5% for spawning was based on an analysis ... (years) 0 5 10 15 20 25 30 0 ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 19–37 : Auteur(s): Mormede, S., A. Dunn, S. Hanchet and S. Parker
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Fishing for toothfish using pots: results of trials undertaken around South Georgia, March–May 2000
Paper Title: Fishing for toothfish using pots: results of trials undertaken around South Georgia ... commercial viability of this fishing method for toothfish fisheries in the CCAMLR Convention Area. While the ... eliminated bird by-catch. To capitalise on this feature, there is a need to improve the commercial viability ... undertaken on this cruise, a number of pots were modified by changing an area of panel for one of larger ... been soaking for longer periods (soak times varied from 4 h 25 min to 40 h 35 min, with an average ... information on the effectiveness of toothfish pot methods for reducing or eliminating the incidental ... teclmical fishing considerations. A relatively flat bottom on grounds with fewer corals was preferred for ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 93–105 : Auteur(s): Agnew, D.J., T.M. Daw, G.M. Pilling and M.G. Purves
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Analysis and modelling of the Soviet Southern Ocean krill fleet, II: Estimating the number of concentrations and analytical justification for search data
number of concentrations and analytical justification for search data Abstract / Description: In this ... 1980s. These examples highlight the need for a navigational log as well as a fishing log in order to ... make accurate inferences. In the appendix, a method for correcting for the bias in the detection of ... information is needed. That figure shows two foci for fishing krill with a gap between them. Without echo ... ). (Figure A6 of Appendix 5 of the Krill CPUE Working Group Report contains an error for the curve in which ... (1989) concentrations are presumed to persist for the entire fishing period of14 to 30 days.) 290 ... simulation study of krill fishing by an individual Japanese trawler. Scientific Committee for the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 283–322 : Auteur(s): Mangel, M.
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Estimating confidence intervals for fish stock abundance estimates from trawl surveys
Paper Title: Estimating confidence intervals for fish stock abundance estimates from trawl ... surveys Abstract / Description: A method is developed for calculating asymptotic confidence intervals for ... trawl surveys, and in particular, develops an improved method for the estimation of confidence ... net haul densities has to allow for an often substantial probability that a given haul will produce ... distribution with one degree of freedom, at the a probability level. An asymptotic confidence interval for ... biomass, given by: where bj is the biomass estimate for stratum j. In calculating an asymptotic ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 203–207 : Auteur(s): de la Mare, W.K
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The 1991/92 fishery for Dissostichus eleginoides in Subarea 48.3
Paper Title: The 1991/92 fishery for Dissostichus eleginoides in Subarea 48.3 Abstract ... / Description: The 1991/92 longline fishery for Dissostichus eleginoides in Subarea 48.3 was open from 4 ... influenced by fishing depth, time of day or soak time, but was dependent on type of hook and geographical ... Russian c 20 to 25 mm 120 cm 2400 - 4800 Russian d 20 to 25 mm 120 cm 13500 Russiane 25 to 30 mm 120 cm ... caught per haul and the number of hooks on the line for the Russian fishery over the whole season ... lower than the mean weight assumed for this species by the Working Group on Fish Stock Assessment (WG ... WG-FSA-92/28 THE 1991/92 FISHERY FOR DISSOSTICHUS ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 31–48 : Auteur(s): Agnew, D.J. and C.A. Moreno
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The biology, ecology and development of fishery management advice for the anomuran crabs at South Georgia (CCAMLR Subarea 48.3)
available information on the biology and ecology of the lithodids at South Georgia and provides an overview ... Paper Title: The biology, ecology and development of fishery management advice for the anomuran ... of the development of a management regime for them. Finally it aims to highlight areas in which ... further research should be directed in order to provide information on which to base the most appropriate ... suitable reduction in catch limit for the fishery, could result in an equivalent impact on the stock due ... and provides an over- view of the development of a management regime for them. Finally, it aims to ... 'S 55°15'S 55°30'S 55°45'S 5 Fishery management advice for the anomuran crabs at South Georgia ... lithodids with low numbers of larvae released over an extended and continuous period that may last for ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 1–15 : Auteur(s): Belchier, M., T. Peatman and J. Brown
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The fishery for Patagonotothen brevicauda guntheri in CCAMLR Subarea 48.3
Paper Title: The fishery for Patagonotothen brevicauda guntheri in CCAMLR Subarea 48.3 Abstract ... / Description: Fine-scale data supplied to CCAMLR for 1987/88 showed that the catches of P atagonotothen ... data and reports to the CCAMLR Working Group on Fish Stock Assessment indicated that this species was ... fishing is likely to have a significant effect on other species. P.b. guntheri has been reported as a by ... the proportion of P.b. guntheri in the total reported for the two species includes an average of ... 12NII which limited the total catch for the season to 13 000 tonnes. In the following year the total ... 21-30 ANI 54 38 15 0 7 0 0 nee 11-20 ANI 54 41 6 4 0 2 21-31 ANI 54 41 178 0 96 0 53 Table 5 ... 350 32 30 - 28 - 26 - 24 - 22 - 20 - 18 - 16 - 14 - 12 - 10 - 8 - 6 - 4 - 2 - 0 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 275–283 : Auteur(s): Everson, I. and C. Mitchell
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Improving estimates of Adélie penguin breeding population size: developing factors to adjust one-off population counts for availability bias
to adjust one-off population counts for availability bias Abstract / Description: New methods are ... presented for the collection and development of data to adjust counts of Adélie penguins made at any time in ... the breeding season to an estimate of the breeding population. The development of ‘availability ... population obtained by adjusting a one-off count using availability adjustment factors will not account for ... undertaken ‘on the same day each year…when about two-thirds of chicks have entered crèches’ in the same ... vegetation, for example, may not be available for counting by an observer passing overhead in an aircraft ... , and marine species diving underwater may not be available for counting by an observer in a passing ... , means that population counts cannot always be obtained at an optimal time of a breeding season for ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 229–241 : Auteur(s): Southwell, C., J. McKinlay, L. Emmerson, R. Trebilco and K. Newbery
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The foraging range of Adélie penguins – implications for CEMP and interactions with the krill fishery
Paper Title: The foraging range of Adélie penguins – implications for CEMP and interactions with ... -scale krill catch data for the regions of interest. The potential for overlap with krill fishing occurs ... where penguins forage downstream from the fishery. It is suggested that the potential for overlap ... , Euphausia superba. Locations of penguins on foraging trips were compared with historical records of fine ... -shaped area with an angle of approximately 30". Whilst fast-ice was still present they walked to the ... this study show that for all sites examined between 50°E and 160°E there is the possibility of an ... has been demonstrated for penguins breeding along the Mawson Coast. Studies at Davis suggest an ... David Agnew and an anonymous reviewer for their constructive criticism. REFERENCES Agnew, D.J. 1992 ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 75–87 : Auteur(s): Kerry, K.R., J.R. Clarke, S. Eberhard, H. Gardner, R.M. Lawless, S. Corsolini, S. Focardi, E. Franchi, D. Rodary and R. Thomson
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The gentoo penguin as a candidate species for the CCAMLR Ecosystem Monitoring Program
Paper Title: The gentoo penguin as a candidate species for the CCAMLR Ecosystem Monitoring ... supporting literature) that the gentoo penguin meets the specified criteria qualifying species for inclusion ... features of special relevance to the CEMP. File: 30-Croxall-and-Williams.pdf ... Program Abstract / Description: Based on dietary and other biological information collected over several ... FOR THE CCAMLR ECOSYSTEM MONITORING PROGRAM IP. Croxall and T.n. Williams* Abstract Based on ... suited for ecosystem monitoring were defined as: (i) specialist predators on the critical prey ... (Wilson, 1983). The sections above on diet and general biology indicate that multi-year data are ... any, CEMP species which are readily accessible on land throughout the year. 4.2 Early Sexual ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 483–488 : Auteur(s): Croxall, J.P. and T.D. Williams