Résultats de la recherche

1. Preliminary results of investigations of the Federal Republic of Germany on Notothenia rossii marmorata (Fischer, 1885) in January/February 1985

   rebuild the stock around South Georgia might be successful. Although reported catches in recent years have ... Notothenia rossii marmorata (Fischer, 1885) in January/February 1985 Abstract / Description:  A bottom trawl ... survey carried out by FRV " Walther Hervig " in January/February 1985 was used to collect ... probably still less than 10% of the pristine stock, Mean length in the catches has only slightly increased ... . Maturity in males is reached at a smaller size and about one year earlier than in females. - 40 ... in the order oI 43 - 46 cm (see ANON., 1984, p. 30). IL can thus be assul'\ed that 3 codenin recent years have been low, N ... that estimated by SGHERBICH (1976) in the first years of commer- cial exploitation. Our do.to. arc ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 33-57 : Auteur(s): Kock, K.-H.

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

   years of poor krill availability. Thus natural  ortality of C. gunnari may, in some years, increase by a ... gunnari) in Subarea 48.3 Abstract / Description:  Management of the mackerel icefish (Champsocephalus ... gunnari) at South Georgia is complicated by the likelihood of substantial periodic variations in natural ... mortality rates. These may be associated with increased consumption of C. gunnari by Antarctic fur seals in ... -year projection period, in only one-third of these was the spawning stock level less than 20% of the ... assumed to be independent between years and equally likely to occur in each year. Results of a number of ... its abundance is low. consume about 28 000 tonnes of fish each year, of Surveys undertaken in the ... predict likely changes in natural mortality from year to year. These could be used to adjust the values ...

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

3. Fish distribution and biomass in the Heard Island zone (Division 58.5.2)

   Paper Title:  Fish distribution and biomass in the Heard Island zone (Division 58.5.2) Abstract ... . In order to assess the potential of this area for commercial fishing, and to obtain some preliminary ... surveys, but this had disappeared by the third survey. Rays were widespread and moderately abundant in ... distribution, abundance and biology of the most important species, covering a number of years and seasons. Five ... variations were not in phase with each other. Duhamel (1991a) has demonstrated a three-year cycle of ... variations in abundance occur, as in C. gunnari, because of the greater number of year-classes available ... densities, but showed u p to ten-fold variability in density over the three years of sampling, and these ... CCAMLR Science, Vol. 2 (1995): 1-20 FISH DISTRIBUTION ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Auteur(s): Williams, R. and W.K. de la Mare

4. Population genetic structure of Patagonian toothfish in the West Indian Ocean sector of the Southern Ocean

   Paper Title:  Population genetic structure of Patagonian toothfish in the West Indian Ocean sector ... structure of Patagonian toothfish (Dissostichus eleginoides) in the West Indian Ocean sector of the Southern ... observer) and Guy Duhamel and Barry Watkins who organised their collection in the French and South ... increased in economic value since the start of commercial exploitation, approximately 17 years ago, within ... (2004): 21–32 21 POPULATION GENETIC STRUCTURE OF PATAGONIAN TOOTHFISH IN THE WEST INDIAN OCEAN ... (Dissostichus eleginoides) in the West Indian Ocean sector of the Southern Ocean. Four collections of D ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 21–32 : Auteur(s): Appleyard, S.A., R. Williams and R.D. Ward

5. Long-term monitoring of krill recruitment and abundance indices in the Elephant Island area (Antarctic Peninsula)

   one- and two-year-old krill (R 1 and R 2 respectively). Statistically significant fluctuations in ... Paper Title:  Long-term monitoring of krill recruitment and abundance indices in the Elephant ... for the Elephant Island area with regard to the representativeness of the study area (60°-62 o 30´S ... and 53 o-57 o 30´W) for proportional recruit and density indices. Proportional recruitment indices ... the study area after 13 days, but was then trapped in an eddy system for another 30 days before ... -year-old animals in the population in that year. 111 a few cases the recalculated values differ ... distribution range adequately and therefore results in an underestimation of the proportion of l-year-old ... Island survey area), but, in the same year, on a much larger scale throughout the Antarctic Peninsula ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 19–35 : Auteur(s): Siegel, V., W. de la Mare and V. Loeb

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

   fishery would be restricted in some of its traditional fishing grounds during years of low krill ... management units in the Scotia Sea Abstract / Description:  Following an assessment of Antarctic krill ... (Euphausia superba) in the Scotia Sea, CCAMLR established a precautionary catch limit of 4 million tonnes and ... catch limit for krill among the SSMUs so as to preclude the inadvertent concentration of catches in a ... SSMU may change from year to year and that an index may have some predictive value in estimating ... consumption were taken from Reilly et al. (in press) who reported the results of a marine mammal survey ... catch limit in the two South Georgia SSMUs and the two Bransfi eld Strait SSMUs could vary from year ... –1 .0 00 0 30 40 –3 17 0 91 Allocating krill catch limit among SSMUs in the Scotia Sea In ...

   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

7. Statistical power to detect changes in growth rates of Antarctic fur seal pups

   changes (between years) in pup growth rates, the loss of power associated with obtaining weight samples on ... Paper Title:  Statistical power to detect changes in growth rates of Antarctic fur seal pups ... only three dates in a season, and potential means of increasing the power of the CCAMLR Ecosystem ... Monitoring Program Standard Method C1 (B). Using estimates of variance in pup weights obtained at Seal Island ... :=,8=0.1 0:=,8=0.1 + + 15 20 25 CHANGE IN 30 35 40 GROWTH 45 50 RATE Figure 2: If the ... each sex and year in Table 1. There were no significant differences in variances of pup weights among ... dates, for either sex in either year (P > 0.13 in all cases). Table 2 shows estimates of growth rates ... reduction in statistical power that would occur if samples of 50 female pups were weighed each year on ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 399–409 : Auteur(s): Boveng, P., J.L. Bengtson and M.E. Goebel

8. Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in Australian sub-Antarctic trawl fisheries

   McDonald Islands (Division 58.5.2) in 1992 and 1993. The range of estimated ages was 4 to 25 years. There ... Paper Title:  Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in ... were no significant differences in growth parameters calculated for males and females. Von Bertalanffy ... operations in the Heard Island region in 2000. The length at first maturity (L 50) was 418 mm (total length ... Ross Sea. 0 100 200 300 400 500 600 700 0 5 10 15 20 25 30 Age (years) To ta l l en gt h ... Dorsal Ventral van Wijk et al. 142 0 5 10 15 20 25 30 -500 -400 -300 -200 -100 0 100 200 300 ... width (distance from last ring to second last ring). The number of fi sh with a birthday in each 30 ... corresponding to the upper end of each bin. 0 5 10 15 20 25 30 200 250 300 350 400 450 500 550 600 650 ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 139–151 : Auteur(s): van Wijk, E.M., R. Williams and A.J. Constable

9. Statistical problems in krill stock hydroacoustic assessments

   Paper Title:  Statistical problems in krill stock hydroacoustic assessments Abstract / Description ... applied to establish biomass in a survey area and the second is the improvement in accuracy of target ... -strength measurements. In the case of statistical methods, there are no clear guidelines for deciding what ... the population is fixed in space, relative to the sampling interval. There remain several unsatisfied ... is approximately 20 n miles from Seal Island, a known penguin rookery. The large swarm observed in ... biomass present in an area, but rather how it is distributed. The issue of patchy years vs more even ... distributed. Consider as a test case that we have two surveys in two consecutive years giving identical ... SC-CAMLR-VII/BG/22 STATISTICAL PROBLEMS IN KRILL STOCK ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Auteur(s): Macaulay, M.C.

10. Analysis of variability of krill size and fish by-catch in the Japanese krill fishery based on scientific observer data

    Paper Title:  Analysis of variability of krill size and fish by-catch in the Japanese krill ... Bayesian model. The models were composed of multistage cluster units (i.e. year, subarea, vessel, cruise ... and haul) based on a state–space model, separating biological process error in the population dynamics ... from fishery process as observation error. In both krill length and by-catch fish number, the ... th (m m ) 60 50 40 30 20 (a) Adult size in Subarea 48.1 Overall trend Year E st im at ... Year E st im at ed m ea n le ng th (m m ) 60 50 40 30 20 (c) Adult size in Subarea ... ed m ea n le ng th (m m ) 60 50 40 30 20 (b) Adult size in Subarea 48.2 Overall trend ... 40 30 20 (e) Year Area Y–A Ves. Cruise Haul Ind. Va ria ...

    Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 31–47 : Auteur(s): Okuda, T. and M. Kiyota

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