Résultats de la recherche

1. An index of per capita recruitment

   recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... in mortality and reduction in the proportion of age-l spawners. Introducing year-to-year random ... underestimate recruits per spawner by 30% if reasonable assumptions are made regarding the variability of ... spawners and recruits. PCR was also able to track cycles in recruits per spawner after a 20% random ... appearing as a large mode at 20 to 30 mm length and in subsequent years as progressively longer length ... modes (Figure 1). The 20-year time series of R1 constructed from these observations (Siege1 et al ... years except for the moderate year class of 1990/91. The non-linear transformation of R1 to PCR ... as age-l animals. In the intervening years without strong year classes the dominant length mode is ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Auteur(s): Hewitt, R

2. Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South Georgia

   the given harvest control rule to set a two-year total allowable catch (TAC). One issue is the ... Length (cm) 10 20 30 40 50 60 Figure 1 ... - aggregated (right). 2009 survey Length (cm) D en si ty 10 20 30 40 50 10 20 30 40 5010 20 30 ... 40 50 30 20 10 0 30 20 10 0 (a) D en si ty 20 15 10 5 0 2009 survey Length (cm) 10 ... 20 30 40 50 (b) Hillary et al. 134 In equation (6) the ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 129–137 : Auteur(s): Hillary, R.M., C.T.T. Edwards, R.E. Mitchell and D.J. Agnew

3. Estimating the impact of depredation by killer whales and sperm whales on longline fishing for toothfish (Dissostichus eleginoides) around South Georgia

   and 4 animals, and have a relatively lower impact on catches, depressing CPUE by up to 20%. Sperm ... whales have been more frequently encountered in recent years, occurring in larger pod sizes, whereas ... 30 3 20 06 4. 2% 4. 9% 4. 4% 3 53 5 3 68 3 3 70 7 3 69 0 20 07 3. 8 ... 30 56 1 23 9 36 3 67 0 1 09 6 5. 1 23 .3 0. 40 0. 65 20 07 14 68 ... 1 62 6 26 1 75 5 58 2 4. 2 14 .0 0. 38 0. 30 20 08 18 51 1 51 1 ... South Georgia Li ne s S P W o bs er ve d (% ) 100 90 80 70 60 50 40 30 20 10 0 May ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Auteur(s): Moir Clark, J. and D.J. Agnew

4. Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia

   - E a, f F 0 8 6 -5 -10 -1 5 -20 3 4 5 6 7 8 9 Age (years) Olsen Frolkina Kock ... following year the information in Frolkina and Dorovskikh (1990) was presented in revised form in Frolkina ... year class: To test whether there is a significant difference between the two survivorship ... by Frolkina and Dorovskikh (1991) and Olsen (1955) for each year is set out in Figure 1. Analysis ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 245–257 : Auteur(s): Everson, I

5. A statistical method for estimating the level of IUU fishing: application to CCAMLR Subarea 48.3

   measures. Three years were analysed: 1998/99, 1999/2000 and 2000/01. Each year fully covered the period 1 ... there must have been at least one encounter with an FPV in a year; no encounters in a year are ... with IUU fishing. The mean and variance of fish catch rate was calculated for each area and each year ... October to 30 September, thus including one summer and one winter period. The estimated mean toothfish ... analysed: 1998/99, 1999/2000 and 2000/01. Each year fully covered the period 1 October to 30 September ... ) W ei gh ti ng fa ct or S A rg os H el en a 26 -F eb -9 7 20 -A ug -9 7 9 30 3. 49 ... 91 .9 1 14 2 1. 54 5 9 S C is ne V er de 20 -M ar -9 7 30 -M ay -9 7 6 99 .8 ... -9 7 9 94 9. 35 18 9. 3 14 0. 07 4 19 W C is ne V er de 20 -M ar -9 7 30 ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 119–141 : Auteur(s): Agnew, D.J. and G.P. Kirkwood

6. Investigation of bias in the mark–recapture estimate of toothfish population size at South Georgia

   allows simulation of releases by box over multiple years. The model performed as expected with test ... of toothfish typically move only 20–30 km each year (Marlow et al., 2003). This paper investigates ... correctly capture movement reversals – where an animal moves west one year and back east the next, for ... 250000 est. population (n) fis hi ng e ff or t (1 00 0 ho ok s) 0 10 20 30 40 50 60 70 ... 10 20 30 40 50 60 70 80 90 0 50000 100000 150000 200000 250000 est. population (n) pr oj ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 47–63 : Auteur(s): Agnew, D.J., G.P. Kirkwood, J. Pearce and J. Clark

7. Precautionary measures for a new fishery on Martialia hyadesi (Cephalopoda, Ommastrephidae) in the Scotia Sea: an ecological approach

   established. Data from the CCAMLR Convention Area suggest that M. hyadesi may live for two years, but this may ... in that year (Rodhouse, 1991). In February 1989 two Japanese squid jiggers carried out an ... were more mature in samples taken later in the year; ranging from stage I1 (Lipinski, 1979) at the ... increments in statoliths were up to one year old (Rodhouse, 1991; Rodhouse et al., 1994). Given the early ... one year. Given the highly seasonal environment of the south Atlantic it is unlikely that life cycle ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 125–139 : Auteur(s): Rodhouse, P.G

8. Distribution characteristics of krill aggregations in the fishing ground off Coronation Island in the 1989/90 season

   /green liver 15 - dark-green/green liver 65 20 40 60 1:30 10 19.12.89 - 7.0I.90r. time ... \~. P . • . • . • 20 30 • • t • , "' ... I' 50 t I· ... ··"· ", • . 0 . 01 . . I ... WG-KRILL-90/20 DISTRIBUTION CHARACTERISTICS OF KRILL ... -east (500 1O'S to 59° 30'S and 43°30'W to 44°W) and south-west (Figure 1). In the daytime, krill was ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 49–73 : Auteur(s): Kasatkina, S.M. and V.I. Latogursky

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

   been put into effect the target years for recovery become fixed at 20 and 30 years after the procedure ... terms). SIR CV Current PL•20 > 0.95 PONAI.20 = 0.5 PGNAI.30~0.95 Stock at Stock 30 years Lower ... 20 ou 30 annees it venir. Ces mortalites par peche sont fondees sur des descriptions probabilistes ... conduit pas forcement it un repeuplement du stock en 20 ou 30 ans, et que, par consequent, les stocks ...

   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

10. Assessment and tag program adaption methods for exploratory fisheries in the CAMLR Convention Area: an example application for Division 58.4.3a

    tagging levels that will produce an expected abundance estimate in the following year of a given precision ... abundance estimator, is defined whereby catch limits and tagging rates can be adjusted together to define ... ), not its status relative to 20% of K in the final year of projection. One might then expect that ... given year or years. No dispersion terms were estimated for the recapture event for obvious reasons ... will produce an expected abundance estimate in the following year of a given precision whilst ensuring ... that would be expected to achieve a given abundance precision for the following year. population ...

    Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 101–113 : Auteur(s): Hillary, R.M

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