Résultats de la recherche

1. Seabird interactions with trawl and longline fisheries for Dissostichus eleginoides and Champsocephalus gunnari

   (Dissostichus eleginoides) in the 1994/95 season near Macquarie Island and Kerguelen Island. Longlining for D ... associated with longlining in the Kerguelen region were lower than those reported for the South Georgia area ... observed during the last 20 years (Woehler, in press) underlines the importance of quantifying the ... within a n d outside the CCAMLR area, and in recent years the D. eleginoides fishery h a s been t he ... for Patagonian toothfish (Dissostichus eleginoides) in the 1994/95 season near Macquarie Island and ... albatross species. Mortality rates associated with longlining in the Kerguelen region were lower than those ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 93–99 : Auteur(s): Williams, R. and D. Capdeville

2. Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught off Kerguelen

   off Kerguelen in 1999 were estimated by reading transverse-sectioned otoliths. Randomly interspersed ... showed discrepancies due to gear-specific catchability, or differences in the available population with ... depth or season. Age–length keys were constructed for use in assessing toothfish catches made by ... mortality Z was estimated to be between 0.09 and 0.12. Significant differences in age-at-length data between ... ge ( ye ar s) 0 10 20 30 40 50 Reference age (years) 0 10 20 30 40 50 E st im at ed a ... Estimated age (years) 0 10 20 30 40 50 T ot al le ng th ( cm ) 0 20 40 60 80 100 120 140 (a ... смертности Z по оценке лежит в диапазоне Ashford et al. 30 Introduction In contrast to early sealing ... , variability in ageing precision can mask year-class strength (Fournier and Archibald, 1982), undermining ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 29–41 : Auteur(s): Ashford, J., G. Duhamel, C. Jones and S. Bobko

3. Utilising data from ecosystem monitoring for managing fisheries: development of statistical summaries of indices arising from the CCAMLR Ecosystem Monitoring Program

   correlated (>0.6). Criteria for inclusion of parameters in the indices are discussed when parameters are ... statistical procedure adopted by WG-EMM in 1996 for identifying anomalies in CEMP parameters. The power of the ... appeared in the data. An alternative procedure, using estimates of the mean and variance of baseline time ... in CCAMLR. File:  06delamare-constable.pdf ... simulation for two forms of alternative hypothesis with data series of up to 20 and 30 years. In both forms ... increase from 10- to 20-year time series resulted in little change in the median performance but in a ... replicates. Smoothing occurred in less than 50% of replicates in some of the 20-year time series for which ... year, even though different sets of parameters may contribute to the indices in different years ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 101–117 : Auteur(s): de la Mare, W.K. and A.J. Constable

4. Acoustic data analysis and models of krill spatial distribution

   / Description:  Acoustic data obtained on 4-5 January 1987 aboard the R/V Professor Siedlecki were used in three ... descriptors of krill spatial aggregation: power spectra for krill biomass fluctuations in space, semivariogram ... wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 km the ... and plays an important role in supporting animal populations such as whales, seals and penguins as ... from 1 km to 20 km and relatively sharp decline in the variance below 100 m in scale, approaching the ... , which is a measure of cohesiveness in animal aggregation. The most probably frequency distribution of ... (cycles/km) Power spectra for krill at the 2-20 km scale observed in this analysis (line) and by Weber ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Auteur(s): Morin, A., A. Okubo and K. Kawasaki

5. Further computations of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass from a survey

   ), as a function of the fraction of the biomass estimate which is set as the catch for a 20-year period ... relate potential krill yield to a pre-exploitation survey estimate of krill biomass. In this paper, the ... fishing mortality, as specified by the Fourth Meeting, results in marked reductions in the probabilities ... , in the interests of brevity, only the results for the 20-year period are reported here. Results ... . Figure 7 shows trends in the average P/B (production/biomass) ratio over the 20-year harvesting period ... effect only after the first ten years, i.e. it is considered first when computing NIla. (vi) In 'year ... biomass estimate which is set as the catch for a 20-year period. Three possible fishing seasons are ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 81–106 : Auteur(s): Butterworth, D.S., G.R. Gluckman, R.B. Thomson, S. Chalis, K. Hiramatsu and D.J. Agnew

6. Areal and seasonal extent of sea-ice cover off the northwestern side of the Antarctic Peninsula: 1979 to 1996

   four periods of extensive ice cover during the last 18 years. Variability in seasonal timing, areal ... with features described by Stammerjohn and Smith (1996) for ice cover in the Bellingshausen Sea ... . Periods of extensive winter ice cover peaked in 1980, 1986, 1991and 1995 and were foreshadowed by the late ... of sea-ice cover were integrated over time to produce an annual index of sea-ice cover in units of 10 ... periodicity of five to eight years in ice cover and note a five-year periodicity apparent in the air ... subsampled area in km2 during the ith year and jth month. RESULTS AND DISCUSSION The Bellingshausen Sea ... ice cover peaked in July-August, a month earlier than the preceding year. The third period peaked in ... . Variability in seasonal timing, area1 extent, seasonal duration and persistence of sea-ice over multiple ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 65–73 : Auteur(s): Hewitt, R

7. Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea

   Islands in 2004. Intensive analysis of otoliths from these specimens greatly increased confidence in the ... interpretation of otolith growth zone structure, supporting the otolith interpretation protocol used in previous ... work on this species. Von Bertalanffy growth models assuming different growth by sex and by year-within ... mean total length-at-maturity (38.8 and 46.4 cm) and mean age-at-maturity (10.6 and 13.6 years) are ... and 30 years old in the second reading. Males Females 0 10 20 30 ... bias plots show that most of the perceived error occurs in fish that were between 13 and 30 years old ... spp.) in the waters in and near the Ross Sea, Antarctica, has operated each year since 1998 (Hanchet ... standard normal distribution R es id ua ls (b) 20 30 40 50 60 70 80 -2 -1 0 1 2 Fitted values R ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 291–303 : Auteur(s): Marriott, P.M., M.J. Manning and P.L. Horn

8. Line weights of constant mass (and sink rates) for Spanish system Patagonian toothfish longline vessels

   with seabirds. The weights typically used are collections of rocks enclosed in netting bags. During ... the option of substituting steel weights for rock weights while remaining in compliance with the sink ... loss by toothed whales) were tested in the experiment. Spanish-system longlines with 8 kg rock weights ... from 0.68 m s –1 (4 kg rocks) to 1.31 m s –1 (8 kg steel) in the shallow depth ranges. Hydrodynamically ... regime arose from Agnew et al. (2000) who showed a reduction in mortality of black-browed albatrosses ... comprise collections of rocks held in bun- dles by netting bags stitched together from trawler net. This ... hook line are tied together to form a continuous line, and weights are tied to the join in the centre ... collections of rocks enclosed in netting bags. During fishing operations the netting bags abrade on the ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 93–106 : Auteur(s): Robertson, G., C.A. Moreno, E. Gutiérrez, S.G. Candy, E.F. Melvin and J.P. Seco Pon

9. An integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) for the Heard and McDonald Islands using CASAL

   Division 58.5.2), using CASAL and data consisting of multi-year random stratified trawl survey (RSTS ... representative of the main plateau, where juvenile fish are found, but are of relatively low intensity in effort ... compared to the commercial shots. In contrast, the commercial shots are very restricted in space ... , consisting of three main grounds. The model implemented in CASAL is a simple, single-sex, single-area ... , 2007b, paragraph 4.6(ii)) noted that the CV in year-class strength (YCS – number of annual age-1 ... with M kept fixed at 0.13 year–1 as recommended in SC-CAMLR (2006). The maximum age was set to 35 ... survey represents only a small frac- tion of fishing effort in any year. A double-normal plateau (DNP ... in the fishing method, ground, fishing year and season were replaced with an estimated ESS. The ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 1–34 : Auteur(s): Candy, S.G and A.J. Constable

10. Age–length composition of mackerel icefish (Champsocephalus gunnari, Perciformes, Notothenioidei, Channichthyidae) from different parts of the South Georgia shelf

    of mature fish in the west is related to the migration of maturing individuals from the eastern and ... to live not only in off-bottom, but also in pelagic waters, an earlier age of sexual maturity ... potentially recover quickly from declines in stock size and may become abundant in the area, as has been ... demonstrated on several occasions in the 1970s and 1980s. File:  09frolkina.pdf ... only observed in five out of 20 abundant year classes at South Georgia (1975,1981,1985,1986 and 1988 ... data, In general, the size composition of C. giiri~zaul varied over the course of the year. On ... reaching 20-25 cm in length (age class 2+) entered the stock targeted by the commercial fishery (Frolkina ... year. including the shallow-water area around Shag The average length of fish observed in May-June ...

    Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 133–146 : Auteur(s): Frolkina, G.A

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