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1. Fishing for toothfish using pots: results of trials undertaken around South Georgia, March–May 2000

   of a pot fishing method to catch Patagonian toothfish (Dissostichus eleginoides) around South Georgia ... the method successfully caught D. eleginoides, there was a large by-catch of crab species. The catch rate ... eliminated bird by-catch. To capitalise on this feature, there is a need to improve the commercial viability ... of the method and minimise the quantity of by-catch. A number of potential changes are suggested to this end ... March to May 2000, the UK undertook trials of a pot fishing method to catch Patagonian toothfish ... , there was a large by-catch of crab species. The catch rate of toothfish was notably lower than that achieved ... in the longline fishery. Importantly, the use of pots eliminated bird by- catch. To capitalise on this feature ... , there is a need to improve the commercial viability of the method and minimise the q~~ant i ty of by-catch ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 93–105 : Author(s): Agnew, D.J., T.M. Daw, G.M. Pilling and M.G. Purves

2. Bias in the estimation of krill yield from using a deterministic formulation of the median unexploited spawning biomass

   for setting catch limits in the krill fishery, while the GYM is used for assessing yield in other finfish ... results from the krill yield model as a basis for setting catch limits in the krill fishery, while the GYM ... the median pre-exploitation spawning biomass. This bias in the krill yield model will result in the catch ... in the krill yield model will result in the catch level given for a set probability of critical depletion being ... catch limits in the krill fishery, while the GYM is used for assessing yield in other finfish fisheries ... assessed. CCAMLR currently uses results from the krill yield model as a basis for setting catch limits ... of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass ... the median pre-exploitation spawning biomass. This bias in the krill yield model will result in the catch ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 1–8 : Author(s): Constable, A.J. and W.K. de la Mare

3. CCAMLR ecosystem monitoring and management: future work

   in the assessment of catch limits. The success of this process is due to the formulation of a management procedure ... in the assessment of catch limits. The success of this process is due to the formulation of a management procedure ... account of the needs of predators in the assessment of catch limits. The success of this process is due ... how harvest controls (catch limits) will be adjusted given the scientifi c assessments available (de ... catch limits meet the objectives of the Convention. It would be contrary to the precautionary ... and Cooke, 1983) is used to determine the long-term sustainable yield (catch limit) for krill fi sheries ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 233–253 : Author(s): Constable, A.J

4. An iterative model to construct an age/length key to assess the age composition of a new fishery for Dissostichus eleginoides in Chilean waters

   this limitation. The age composition of catch for Dissostichus eleginoides was obtained with the application ... estimation of age composition of catch requires that age/length data and random length frequency have been ... could be biased. By using an iteration algorithm it is possible to overcome this limitation. The age ... composition of catch for Dissostichus eleginoides was obtained with the application of a single age/length key ... estimation of age composition of catch requires that age/length data and random length frequency have been ... could be biased. By using an iteration algorithm it is possible to overcome this limitation. The age ... composition of catch for Dissostichus eZeginoides was obtained with the application of a single age/length ... 2: PHCYHOK 1: PHCYHOK 2: 20 List of Tables Age composition of D. eleginoides catches obtained ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 11–20 : Author(s): Robotham, V. H. and Z. Young U.

5. Fishing intensity of the Soviet fleet in krill fisheries in the southern Atlantic (Subareas 48.2 and 48.3)

   Subareas 48.2 and 48.3. During this period catches reported by the Soviet fleet amounted to more than 95 ... % of the total catch. The calculations were based on haul-by-haul data from the Soviet fleet, using a probability ... catches reported by the Soviet fleet amounted to more than 95% of the total catch. The calculations were ... used to indicate the estimated pre-exploitation biomass. The precautionary krill catch limit in Area ... of the 20-year fi shing history, the precautionary catch limit had never been approached. Furthermore ... of the consequences of setting the annual krill catch limit to a fi xed fraction of the estimate of krill biomass ... within Subareas 48.2 and 48.3. During this period catches reported by the Soviet fl eet amounted ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 15–35 : Author(s): Kasatkina, S.M. and V.F. Ivanova

6. A generalised model for evaluating yield and the long-term status of fish stocks under conditions of uncertainty

   stochastic stock trajectories under a specified catch regime. The model uses an adaptive Runge-Kutta ... algorithm to calculate stock trajectories and catch rates over a specified simulation period. The procedure ... are compared with existing analyses from the krill yield model. The model can include a known catch history ... and yield per recruit. It can also be used to evaluate stochastic stock trajectories under a specified catch ... ). Butterworth et al. (1991, 1994) produced a model specifically for evaluating catch limits for krill ... of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass ... to evaluate stochastic stock trajectories under a specified catch regime. The model uses an adaptive Runge ... -Kutta algorithm to calculate stock trajectories and catch rates over a specified simulation period ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 31–54 : Author(s): Constable, A. and W.K. de la Mare

7. Some aspects of the relation between Antarctic krill abundance and CPUE measures in the Japanese krill fishery

   limitations on the vessels, and product quality considerations- in particular the increasing tendency to avoid ... catching “green” krill. These factors result in Catch-per-Day and Catch-per-Haul measures being unlikely ... to index krill abundance. During the high season, Catch-per-Towing-Time seems likely to index only within ... operation are the constraints imposed by processing rate limitations on the vessels, and product quality ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 109–125 : Author(s): Butterworth, D.S.

8. Towards an initial operational management procedure for the krill fishery in Subareas 48.1, 48.2 and 48.3

   , and an algorithm for specifying the levels of regulatory mechanisms (e.g., a catch control law) that depends ... to this constraint, accumulated catches should be as large as possible without substantial associated probability ... to illustrate the overall process proposed; for this illustrative exercise, the choice of catch control law ... of regulatory mechanisms (e.g., a catch control law) that depends on the results of the assessment ... 3. THE REGULATORY MECHANISM ALGORITHM The regulatory mechanism proposed is catch limitation (Le., TAC). Why ... assessment advice. The Sub-Committee believed that in the normal course of events, the catch limit produced ... by the management procedure should be accepted unchanged by the Committee, and that the catch limit should only ... the levels of regulatory mechanisms (e.g., a catch control law) that depends on the results ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 189–219 : Author(s): Butterworth, D.S.

9. Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South Georgia shelf

   /87). Catch-per-hour of fishing was analysed by the time of day. Catches made by both bottom trawls ... no catches at all. The information obtained on vertical migrations of C. gunnari may be used ... of high abundance of the species (1982/83, 1983/84 and 1986/87). Catch-per-hour of fishing was analysed ... by the time of day. Catches made by both bottom trawls and midwater trawls were taken into account ... trawl in January 1983. 1 - The upper depth limit of catches; 2 - The lower depth limit of catches ... of high abundance of the species (1982/83, 1983/84 and 1986/87). Catch-per-hour of fishing was analysed ... by the time of day. Catches made by both bottom trawls and midwater trawls were taken into account ... at night. Fishing during this period with bottom trawls had yielded almost no catches at all ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 3–14 : Author(s): Frolkina, J.A. and V.I. Shlibanov

10. Towards the development of a management plan for mackerel icefish (Champsocephalus gunnari) in Subarea 48.3

    approach to the setting of precautionary catch limits for this fishery. An approach based on the CCAMLR ... catch limits for this fishery. An approach based on the CCAMLR generalised yield model (GYM ... approach to the setting of precautionary catch limits for this fishery. An approach based on the CCAMLR ... in the light of CCAMLR's three-part decision rule for determining catch limits from stochastic models ... level adopted for a sustainable catch limit (or TAC), is the lower of y, and y,. * Predator indices ... , was lower as the multiplier of M increased. Over the range of catches shown in Figure 4, limited ...

    Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 63–77 : Author(s): Agnew, D.J., I. Everson, G.P. Kirkwood and G.B. Parkes

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