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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 ... –length key described above. The choice of 1% for mature and 2.5% for spawning was based on an analysis ... to fitting them in the model) were assumed at an effective sample size of 30 for catch-at-age ... (years) 0 5 10 15 20 25 30 0 ... 5 10 15 20 25 30 Age (years) 1.0 0.8 ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 19–37 : Autor(es): Mormede, S., A. Dunn, S. Hanchet and S. Parker
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Intra-annual variability in the density of Antarctic krill (Euphausia superba) at South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ‘annual’ estimates of krill density
the regression-predicted within-year variation. Years that stand out for markedly low krill density ... South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ... -year’ variation could simply be attributed to sampling on different dates of the year (e.g. November cf ... profilers (300 kHz) and echo sounders (125 kHz) were deployed on moorings on- and off-shelf to the northwest ... management (Everson, 1992) and for understanding change on an interannual scale. Moored instrument arrays ... time-series of krill density at 30-minute intervals for both the on- shelf and off-shelf mooring. For ... -predicted within-year variation. Years that stand out for markedly low krill density (i.e. densities below ... , timing and causes of intra-annual variability is thus an essential prerequisite for ecosystem ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 27–41 : Autor(es): Saunders, R.A., A.S. Brierley, J.L. Watkins, K. Reid, E.J. Murphy, P. Enderlein and D.G. Bone
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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 ... the past ten years there has been a fishery for Patagonotothen brevicauda guntheri in CCAMLR Subarea ... 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 : Autor(es): Everson, I. and C. Mitchell
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Seabird interactions with longlining operations for Dissostichus eleginoides at the South Sandwich Islands and South Georgia
Paper Title: Seabird interactions with longlining operations for Dissostichus eleginoides at the ... mortality was seen and only one bird was caught on a hook; nevertheless many species in these aggregations ... lines and gave specifications for the line in an appendix to the measure. Based on experiences in the ... scientist to participate as an observer on board the fishing vessel conducting the exploratory fishing ... but were 10 mm in diameter. Pieces of the squid Illex argentinus were used for bait, with roughly 20 ... Georgia area (Subarea 48.3) on 22 February. The first two were sighted during daylight. Large numbers ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 143–153 : Autor(es): Ashford, J.R., J.P. Croxall, P.S. Rubilar and C.A. Moreno
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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 ... 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 ... to longlines, with an anchor at each end preventing the line from dragging on the bottom. AII ai ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 93–105 : Autor(es): Agnew, D.J., T.M. Daw, G.M. Pilling and M.G. Purves
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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 ... available information on the biology and ecology of the lithodids at South Georgia and provides an overview ... 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 ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 1–15 : Autor(es): Belchier, M., T. Peatman and J. Brown
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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 ... Program Abstract / Description: Based on dietary and other biological information collected over several ... years at Bird Island, South Georgia and at the South Shetland Islands (both within Integrated Study ... supporting literature) that the gentoo penguin meets the specified criteria qualifying species for inclusion ... 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 ... Maturity With typical ages of first breeding being at two and three years old (Williams, 1990), gentoo ... 1980/81. Polish Polar Research 5: 17-30. JABLONSKI, B. 1985. The diet of penguins on King George ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 483–488 : Autor(es): Croxall, J.P. and T.D. Williams
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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 ... 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 ... 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 ... 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 : Autor(es): Agnew, D.J. and C.A. Moreno
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A simple approach for calculating the potential yield of krill from biomass survey results
for the calculations is that the probability that the krill spawning biomass drops below 20% of its ... median pre-exploitation level over a 20 year period of harvesting should equal 10%. The value of, λ ... Paper Title: A simple approach for calculating the potential yield of krill from biomass survey ... results Abstract / Description: Estimates are calculated for the parameter λ in the yield equation Y = λ ... -exploitation level over a 20 year period of harvesting should equal 10%. The value of 'A, depends strongly on ... (A.2), for "years" y = 2 to 11. Thus, by "year" y = 10, all memory of the initial deterministic age ... 0.2 occurs during the 20 year harvesting period. (x) Repeat steps (ii» to (ix) for different values ... which is typically less than 0.5. A basis for calculating an appropriate value for A. is set out in ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 207–217 : Autor(es): Butterworth, D.S., A.E. Punt and M. Basson
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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 ... , Euphausia superba. Locations of penguins on foraging trips were compared with historical records of fine ... -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 ... Program (CEMP) seeks to determine whether the harvest of krill is likely to have an impact on krill ... compares these foraging locations with fine-scale catch data on Antarctic krill, Euphat~sia szlpevba, for ... for each location. I Location of Colony I Years Bechervaise Island (Mawson) Scullin Monolith ... -shaped area with an angle of approximately 30". Whilst fast-ice was still present they walked to the ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 75–87 : Autor(es): Kerry, K.R., J.R. Clarke, S. Eberhard, H. Gardner, R.M. Lawless, S. Corsolini, S. Focardi, E. Franchi, D. Rodary and R. Thomson