Résultats de la recherche

1. Possible effects of different levels of krill fishing on predators – some initial modelling attempts

   CCAMLR Ecosystem Monitoring Program (WG-CEMP) in 1992, in order to investigate the possible effects of ... krill predator species. A 'one-way' interaction model is developed, in which krill abundance ... that variability in the annual recruitment of krill results in predator populations being less ... some krill predator populations, and on the possibility of biases in their estimation. These matters ... duration, using equation (3). The distribution of NIK,, in year 200 then provides the stochastic analog ... reduced in a particular year if an upper bound of 1.5 yr-' on the effective annual fishing mortality for ... respectively as follow: years in which both adult survival and breeding success are high, those B / [ ~ A ... value (K) - see the solid curve in Figure 1. If p is the proportion of years in which adult survival ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 79–97 : Auteur(s): Butterworth, D.S. and R.B. Thomson

2. Some principles for fisheries regulation from an ecosystem perspective

   / Description:  The paper discusses some principles to be considered in the formulation of a framework for the ... Marine Living Resources. An important task in this formulation is to derive subsidiary objectives for ... out in the Convention. An important property required for subsidiary objectives is that they are ... framed in terms of quantities which can be robustly estimated, thus allowing the degree to which ... by experiment could be of the order of hundreds of years (de la Mare, 1986a). In practice, it is ... principles to be considered in the formulation of a framework for the. regulation of fisheries from an ... important task in this formulation is to derive subsidiary objectives for regulation which have a more ... rigorous scientific interpretation than the broad principles of conservation set out in the Convention ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 323-339 : Auteur(s): de la Mare, W.K.

3. Species identification and age estimation for the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea

   toothfish fishery in the Ross Sea dependency in 2002 were identified by observers and returned to New ... in the Ross Sea (CCAMLR Subarea 88.1). The zones are assumed to form annually as this ageing ... , living to at least 50 years. Females grow at a faster rate, and reach a larger size, than males, but both ... be from 12 to 14 years. File:  03marriott-etal.pdf ... 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 45 50 55 60 Age (years) To ta l l en gt h ... . holotrachys Species identifi cation and age estimation for M. whitsoni 44 Marriott et al. 0 10 20 30 ... linear regressions. Males y = 0.3287x + 0.511 R2 = 0.865 n = 552 0 10 20 30 40 0 20 40 60 80 100 ... ) Females y = 0.3917x - 1.9855 R2 = 0.923 n = 900 0 10 20 30 40 0 20 40 60 80 100 Total length (cm ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 37–51 : Auteur(s): Marriott, P., P.L. Horn and P. McMillan

4. Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana) from the Ross Sea

   georgiana in the Ross Sea suggested that these skates initially grow very rapidly for about five years ... been generated that suggest much slower growth, greater ages-at-maturity (about 20 years compared with ... and growth in A. georgiana that is radically different from the published interpretation is presented ... . By counting fine growth bands in the caudal thorns instead of broad diffuse bands, growth curves have ... (years) 0 10 20 30 40 R ea de r 1 , r ea di ng 2 (y ea rs ) ( m ea n ± 2S E ) 0 10 20 ... about 48 cm in 10 years and 66–69 cm in 20 years (Figure 3). Thereafter, reader 2’s growth curve ... , longevity in A. georgiana is probably at least 30 years, and possibly greater than 40 years. Using ... estimated to occur at about 20 years in this species, albeit with a potentially wide variation: 67 cm PL ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 211–220 : Auteur(s): Francis, M.P. and M.J. Gallagher

5. Refinements to the strategy for managing depleted fish stocks based on CCAMLR objectives

   states of a depleted stock, and take into account uncertainty in assessments. Sample calculations show ... that applying a policy of F 0.1 will not always lead to stock recovery in two to three decades, and ... distribution at year 20 is the sum of the projected distributions, for the set of current stock states in the ... being above the current level in year 20 (denoted PL,20> 0.95 in the table); (3) 50% confidence in ... the stock being above GNAl in year 20 (denoted PONAI.20 = 0.5 in the table); and (4) 95% confidence ... in the stock being above GNAl in year 30 (denoted PONAI.30 ~ 0.95 in the table). There are several ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 467–475 : Auteur(s): de la Mare, W.K. and A. Constable

6. [node:field-journal-volume]:37-51

   40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 45 50 55 60 Age (years) To ta l l en gt h ... . holotrachys Species identifi cation and age estimation for M. whitsoni 44 Marriott et al. 0 10 20 30 ... linear regressions. Males y = 0.3287x + 0.511 R2 = 0.865 n = 552 0 10 20 30 40 0 20 40 60 80 100 ... ) Females y = 0.3917x - 1.9855 R2 = 0.923 n = 900 0 10 20 30 40 0 20 40 60 80 100 Total length (cm ...

   Science Journal Paper : 37–51

7. Observations of fishing operations on a krill trawler and distributional behaviour of krill off Wilkes Land during the 1985/86 season

   operations were observed on board a commercial vessel and the actual operation described in detail. ‘Fish ... -finder’ was most useful in detecting swarms, while sonar was used to judge the towing direction. The size ... of fished swarms ranged from 100 m to 10 km with different distributions occurring in different ... off Africa. In recent years, the through-year activity of the trawlers has come to be incorporated ... paired samples from 30 sets of measurements, it was concluded that krill were well mixed in the net and ... off Wilkes Land tends to differ year to year in contrast, to the rather stable proportion of LL ... was caught in 14 min. of towing. Absolute density was estimated as 40 g/m3 20 t r-l V-;::l cO ::r ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 335-368 : Auteur(s): Ichii, T.

8. A rationale for conservation areas within Antarctic waters

   :  The application of potential conservation measures listed in Article IX 2 of the Convention requires ... marine living resources’ (Article IX 2 (b)). In order to select meaningful boundaries for such areas ... potential conservation measures listed in Article IX 2 of the Convention requires "the designation of ... " (Article IX 2 (b)). In order to select meaningful boundaries for such areas, first priority has been ... in earlier years within the sector from 700 W to 160o W. More recently there has been a move within ... in Article IX 2(b) of the Convention. - 517 - As was recognised in the Australian submission, a ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 513-535 : Auteur(s): Chittleborough, R.G.

9. Selectivity of standard Polish commercial trawl codends on Antarctic fishing grounds

   Abstract / Description:  Selectivity studies were carried out for two types of steelon codends used in ... process- especially in the latter case- is not satisfactory. Scotia Sea icefish, Chaenodraco wilsoni, and ... the trawling among all the species studied. Conclusions and observations were in some cases based on a ... in the case of 80 mm codend. Selection effectiveness increased from 20% for 80 mm codend to almost ... phase) No. of fish 6 814 20 701 3 217 7 053 3 090 measured in codend No. of fish 2 198 2 826 420 8 ... I I / B / / /: I I I I I ./e r-=- 20 30 Figure 5: Selectivity ogive for ... ..-_, __ ...,.--_,.--_...,.--__ 20 30 1.,0 50 [CM] I=\S+\ LENCHl Selection of bumphead notothenia on ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 107-142 : Auteur(s): Zaucha, J.

10. Effects of different harvesting strategies on the mackerel icefish Champsocephalus gunnari around South Georgia

    the mackerel icefish (Champsocephalus gunnari) have been simulated for a period of 30 years. These ... interval of three years with no fishing in between; and changes in net selectivity resulting in a shift in ... , should not occur earlier than four years after a good recruitment. A forward shift in partial recruitment ... fishing proved to be the least preferable harvesting alternative. In the absence of regular recruit ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 77–100 : Auteur(s): Köster, F.W. and K.-H. Kock

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