Résultats de la recherche

1. A risk-management framework for avoiding significant adverse impacts of bottom fishing gear on Vulnerable Marine Ecosystems

   Paper Title:  A risk-management framework for avoiding significant adverse impacts of bottom ... , closed areas around identified VMEs, open and closed management areas, by-catch limits for VME-forming ... organisms, gear modification or spatial distribution of fishing effort. (iv) Review. All of the above steps ... information is not known, as is the case for VMEs in the Southern Ocean, an appropriate spatial scale for ... Likely (5) 0 5 10 15 20 25L ik el ih oo d Almost certain (6) 0 6 12 18 24 30 Martin-Smith 184 ... - cautionary approach of CCAMLR (see Constable et al., 2000 for review) will result in the likelihood of ... studies. For example, damage to Lophelia pertusa reefs off Norway was estimated to be 30–50%, but the ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 177–193 : Auteur(s): Martin-Smith, K

2. 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 ... (A.2), for "years" y = 2 to 11. Thus, by "year" y = 10, all memory of the initial deterministic age ... "year") is accordingly: 7 Bsp(Y) = L wa Ny,a (A.5) a=am where am is the age-at-maturity for ... -first-capture, choose a value forA. (ii) For "year" y=l, set up deterministic equilibrium age ... 0.2 occurs during the 20 year harvesting period. (x) Repeat steps (ii» to (ix) for different values ...

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

3. 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 ... dynamics of spatial heterogeneity of the population along with age structure, movement and reproductive ... stage transition in a holistic framework. Using this software, three spatially explicit age-structured ... models were developed for the Antarctic toothfish (Dissostichus mawsoni) population in the Ross Sea ... to fitting them in the model) were assumed at an effective sample size of 30 for catch-at-age ... 5 10 15 20 25 30 Age (years) 1.0 0.8 ... (i,j) for category k at age l at the end of the 100th year of the second initialisation phase, and ... rate of 1 All age by one year (30+ remain 30+) 1 - - - Total 16 processes 34 Mormede et al ...

   Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 19–37 : Auteur(s): Mormede, S., A. Dunn, S. Hanchet and S. Parker

4. A proposed management procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity

   catches made. An MP with control parameter values specified is proposed for implementation based on the ... results of the trials. Given the importance of an adequate catch rate for the economic viability of the ... Paper Title:  A proposed management procedure for the toothfish (Dissostichus eleginoides ... ‘Optimistic’, ‘Intermediate’, ‘Less Pessimistic’ and a ‘Pessimistic’ current status for the resource are ... following proce- dure: 1. Numbers-at-age ( ',y aN ) for the start of the year in which projections ... Bsp over the 20-year pro- jection period falling below 50% of Ksp is zero for the Optimistic and the ... numbers-at-age for year y’ are projected forward under a true catch given by the sum of TACy’ (the legal ... 20-year projec- tion period is zero under all OMs except for the Pessimistic one for which it is ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 33–69 : Auteur(s): Brandão, A. and D.S. Butterworth

5. Options for allocating the precautionary catch limit of krill among small-scale management units in the Scotia Sea

   Paper Title:  Options for allocating the precautionary catch limit of krill among small-scale ... management units in the Scotia Sea Abstract / Description:  Following an assessment of Antarctic krill ... catch limit for krill among the SSMUs so as to preclude the inadvertent concentration of catches in a ... small portion of the surveyed area. Five options for allocating the catch limit among the SSMUs in the ... 3 0 20 40 60 80 100 Krill biomass density (g m-2) A 1 st an d ar d d ev ia te y ... R2 = 0.1163 -3 -2 -1 0 1 2 3 0 20 40 60 80 100 Krill biomass density (g m-2) A 2 st an d ... standing stock less predator demand for an SSMU is less than zero, then no catch limit would be allowed ... SSMU may change from year to year and that an index may have some predictive value in estimating ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 81–97 : Auteur(s): Hewitt, R.P., G. Watters, P.N. Trathan, J.P. Croxall, M.E. Goebel, D. Ramm, K. Reid, W.Z. Trivelpiece and J.L. Watkins

6. 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 ... the values selected to standardize the model. The mean coefficient of variation for the CPUE values ... was 0.399. File:  20-Gasiukov.pdf ... WG-FSA-90/27 STANDARDIZATION OF FISHING EFFORT FOR ... certain year. A standardized value for catch-per-effort for a given type of category is calculated by ... for the C. gunnari fishery for the period from 1981/82 to 1989/90 are represented in Tables 1 to 3 ... of the multiplicative model for fishing effort standardization in a special case. NAFO SCRDoc. 90/50 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 327–336 : Auteur(s): Gasiukov, P.S.

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

   known catch history and thus allow assessments of yield to be made for existing fisheries. An example is ... Paper Title:  A generalised model for evaluating yield and the long-term status of fish stocks ... projection model for assessing the long-term annual yield which satisfies objectives for the maintenance of ... biomass. The model provides a flexible method for assessing the influence of different patterns of growth ... of growth during the year); an age-selectivity function, a(a) (allows for a fishery that targets ... ) 1.21 I 0 10 20 30 40 50 60 Length (mm) Selectivity (b) 1.6 1 1 0 2 4 6 Age (years) Relative ... against age and time of year, is a convenient method for incorporating Monte-Carlo integration over the ... T = a -t- t, for fish of age a at time of year t. The growth function covers the entire lifespan of ...

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

8. Investigations of required sampling regimes for environmental parameters

   Paper Title:  Investigations of required sampling regimes for environmental parameters Abstract ... speed continuously or as daily maxima and minima would be sufficient to detect a 10 to 20% change in ... monthly mean temperature over two years with a significance α of 0.05 and a power P of 0.8. Sampling wind ... detection Wind speed daily multiple n=8 per day 10-20% High recording for one month daily multiple n-30 ... ------'~-------"--~--~------~ o 1 0 20 30 days Figure 2: Maximum daily pressure for January 1985, Davis Station, showing the ... ~--~.-------.---~-'--------~ 5 10 15 20 25 30 35 days Figure 4: Daily wind speed by three hour sampling period for January 1985 ... temperatures in that 563 year were lower than for the other two years (see Figure 1). Maximum and minimum ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 561–573 : Auteur(s): Agnew, D.J.

9. Potential nursery areas for fish in the Prydz Bay region

   break. The dominant size class was of 45 mm standard length, which corresponds to an age of 1 ... Paper Title:  Potential nursery areas for fish in the Prydz Bay region Abstract / Description:  A ... for the shelf area of the Bay to be a nursery ground for nototheniid and channichthyid fish. Nearly ... antarcticum. This species was abundant (up to 9 100 were caught in a 30 minute haul) especially near the shelf ... standard length, which corresponds to an age of 1+. Nototheniids and channichthyid juveniles were much ... 7 to 8 m high, and nets were towed at fishing depth for a standard haul duration of 30 minutes at 3 ... reasonably well with the 0+, 1+ and 2+ year groups established by Hubold and Ekau (1986) for P. antarcticum ... . antarcticum catches. 375 -64 individuals/30 minute trawl 1 5 0 10 0 20 0 Q) "Cl 0 B 30 :;l ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 369–380 : Auteur(s): Williams, R.

10. Exploratory fishing for Dissostichus spp. in the Antarctic region (Subareas 48.1, 48.2 and 88.3)

    Paper Title:  Exploratory fishing for Dissostichus spp. in the Antarctic region (Subareas 48.1 ... system) were used for the operation, with variable quantities of fish hooks (1 440 to 4 320), No. 9 ... /hook (Subarea 88.3), 19.1 g/hook (Subarea 48.1) and 3.0 g/hook (Subarea 48.2), and an average over all ... occurs. The search for new fishing areas will have an impact on present and future fisheries for D ... of males ranged between 37 and 142 cm, with an average of 78.5 cm (SD = 25.1), while for females it ... for both sexes. This gives an average yield of 59% for the HGT product. With the maturity scale ... general similar to those reported for other regions. Concerning the biological aspects, an allometric ...

    Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 1–17 : Auteur(s): Arana, P.M. and R. Vega

Pages