Search results

1. 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.

   , M, using multiple cohorts and multiple years of catch-at-age and aged mark-recapture data was tested using ... obtained by integrating an ordinary differential equation (ODE) for within-year population dynamics ... ; constant catch ODE (CCODE) model uses a new total mortality ODE with constant within-year catch per unit ... the process error in predicted catch-at-age numbers. Simulations assumed 1 000 releases per year over 12 years ... , this gave year classes or cohorts (c) of 1 to 46 corresponding to calendar years of 1975 to 2020 for which ... –7.30 CCODE 0.10 LN 0.0993 0.1485 –27.64, 20.58 –0.73 14.87 15.76 BODE 0.13 LNf 0.1266 0.0709 –12.06 ... multiple cohorts and multiple years of catch-at-age and aged mark-recapture data was tested using ... obtained by integrating an ordinary differential equation (ODE) for within-year population dynamics ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Author(s): Candy, S.G.

2. Status of the coastal stocks of Dissostichus spp. in East Antarctica (Divisions 58.4.1 and 58.4.2)

   operating off the coast of East Antarctica (30°E–150°E; FAO/CCAMLR Divisions 58.4.1 and 58.4.2) since 2003 ... with the Ross Sea, where an analytical assessment has been possible for several years, and through analysis ... where time at liberty was a year or more). These recaptures were inconsistent with expectations given ... (30°E–150°E; FAO/CCAMLR Divisions 58.4.1 and 58.4.2) since 2003. An experiment run from ... in Divisions 58.4.1 and 58.4.2. Fishing years extend from 1 December of the previous year to 30 November ... . have been operating off the coast of East Antarctica (30°E–150°E; FAO/CCAMLR Divisions 58.4.1 ... rates with the Ross Sea, where an analytical assessment has been possible for several years ... recaptured (only five where time at liberty was a year or more). These recaptures were inconsistent ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 71–100 : Author(s): Agnew, D.J., C. Edwards, R. Hillary, R. Mitchell and L.J. López Abellán

3. 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

   on D. eleginoides fisheries at the Crozet Islands 0 10 20 30 40 50 60 70 80 90 100 2003/04 2004/05 2005 ... between 2003 and 2008. 0 10 20 30 40 50 60 70 80 A B C D E F G Fishing vessel In te ra ct io ... is described under ‘Methods’. Tixier et al. 188 –10 –5 0 5 10 15 20 25 30 2003/04 2004/05 2005/06 ... Islands EEZ. The vessels operated all year round with higher activ- ity in February when the fishery ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 179–195 : Author(s): Tixier, P., N. Gasco, G. Duhamel, M. Viviant, M. Authier and C. Guinet

4. A simple approach for calculating the potential yield of krill from biomass survey results

   -exploitation level over a 20 year period of harvesting should equal 10%. The value of, λ depends strongly ... -exploitation level over a 20 year period of harvesting should equal 10%. The value of, λ depends ... for the calculations is that the probability that the krill spawning biomass drops below 20% of its median pre ... for the calculations is that the probability that the krill spawning biomass drops below 20% of its median pre ... to exploitation, over a 20 year period of harvesting, is equal to 10%. Clearly the value of A. is dependent ... upon which to regulate the fishery for the following 20 years, is that from a single pre-exploitation ... 0.2 occurs during the 20 year harvesting period. (x) Repeat steps (ii» to (ix) for different values ... is that the probability that the krill spawning biomass drops below 20% of its median pre-exploitation level over a 20 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 207–217 : Author(s): Butterworth, D.S., A.E. Punt and M. Basson

5. Krill biomass in Area 48 and Area 58: recalculations of FIBEX data

   3S'W 30'W 2S'W 20'W 1S'W r-------------------------~------------~------t_SO'S ...... 00 ... and Proressor Sledleckl MERCATOR PROJECTION .".,. 00 '1" ~ W c::: ~ P=l ;::J rJ) 30'W 2S'W 20 ... ~--~--~--~--~--~----~--~--~--~~ 20 25 30 35 40 45 50 55 60 65 70 Length (mm) Figure 3: Relationship between krill target strength ... WG-KRILL-92/20 KRILL BIOMASS IN AREA 48 AND AREA 58 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 157–181 : Author(s): Trathan, P.N., D.J. Agnew, D.G.M. Miller, J.L. Watkins, I. Everson, M.R. Thorley, E. Murphy, A.W.A. Murray and C. Goss

6. On the power to detect changes using the standard methods for monitoring parameters of predatory species

   changes of 10%, 20% and 30% of the mean value (males, 12.4 days; females, 10.0 days) for the 5 years ... and by females was 3.9 days. The requisite sample sizes for detecting changes of 10%, 20% and 30% of the mean ... , for detecting changes of 10%, 20%, and 30% of the mean values are shown for Adelie and chinstrap penguins ... estimated the sample sizes required to detect changes of 10%, 20%, and 30% of the mean values for Adelie ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Author(s): Boveng, P. and J.L. Bengtson

7. Some thoughts on precautionary measures for the krill fishery

   of the spawning biomass dropping below 20% of its pre-exploitation median level over a 20-year harvesting period ... is 10%; and the median krill escapement1 in the spawning biomass over a 20-year period is 75 ... estimates can be made, leading to more precise conservation measures. Article I1 of the CCAMLR Convention ... that with a lifespan of five to seven years, at least two generations of krill have passed through the system since ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 1–11 : Author(s): Everson, I. and W.K. de la Mare

8. A review of the diet and at-sea distribution of penguins breeding within the CAMLR Convention Area (submitted to the 2008 Joint CCAMLR-IWC Workshop)

   animal, but it is less intrusive than killing birds for dissection. Food recovered from stomachs ... / C12; δC13). δN15 gives an indication of the trophic level at which an animal feeds, while δC13 indi ... several months or years and feathers the period prior to moult. Biodegradable samples (blood or flesh ... ) need to be stored in 70% alcohol or frozen at –20°C, but feathers, toenails, eggshell and bone ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 75–114 : Author(s): Ratcliffe, N. and P. Trathan

9. Evidence to support the annual formation of growth zones in otoliths of Antarctic toothfish (Dissostichus mawsoni)

   mode. This indicates that the modes represented year classes and that one translucent zone is formed ... annually in otoliths of juvenile D. mawsoni. Mean fish lengths at ages 0.5, 1.5, 2.5 and 3.5 years were ... years. Counting translucent zones in the otoliths of D. mawsoni appears to be a valid method ... been injected with oxytetracycline some years before recapture. The six recaptured fish were all large ... to 4.0 cm yr-1 for fi sh aged from 15 to 30 years. It is interesting that all the points from ... are shown as diamonds connected by lines. 0 20 40 60 80 100 120 140 160 180 0 5 10 15 20 25 30 ... -901, Kilbirnie Wellington, New Zealand A.L. DeVries Department of Animal Biology University ... represented year classes and that one translucent zone is formed annually in otoliths of juvenile D. mawsoni ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 125–138 : Author(s): Horn, P.L., C.P. Sutton and A.L. DeVries

10. Seabird interactions with longlining operations for Dissostichus eleginoides at the South Sandwich Islands and South Georgia

    . Pieces of the squid Illex argentinus were used for bait, with roughly 20-30 g/hook. Although expensive ... setting, hook vulnerability, CCAMLR INTRODUCTION In recent years, decreases in populations of several ... % - representing a saving of $A4.9 million and 30 300 albatrosses annually. The Japanese tuna fishery ... and polyethylene rope, to which were tied secondary lines 1.2 m long, made of Vinylon TwineTM #20. Eyeless hooks ...

    Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 143–153 : Author(s): Ashford, J.R., J.P. Croxall, P.S. Rubilar and C.A. Moreno

Pages