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1. Length- and age-at-spawning of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea

   maturation stage by approximately May each year. The age at 50% spawning for females on the Ross Sea slope ... region is 16.6 years (95% CI 16.0–17.3) or 133.2 cm (95% CI 130.9–135.7) by length. On average, males ... spawn at a younger age with an A 50% of 12.8 years (95% CI 11.9–14.0) or 120.4 cm (95% CI 114.8–126.7 ... stage for at least one year. Individual oocytes are then recruited into the vitellogenic phase over at ... age at 50% spawning for females on the Ross Sea slope region is 16.6 years (95% CI 16.0–17.3) or ... assessment for D. mawsoni assumed an A50% of 9 years, corresponding to an L50% of 100 cm (95% range of ±15 ... for females (16.6 years) on the Ross Sea slope and at (12.8 years) for males in the Ross Sea. The ... L50% for the hindcast ogive. 0 10 20 30 40 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 Age (y) P ro po rti ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 53–73 : Автор(ы): Parker, S.J. and P.J. Grimes

2. Preliminary appraisal of Antarctic fish selection by the 32/36 bottom trawl combined with various codends

   of both tape codends were much better. It was found that an optimum mesh size of this codend for ... material used for their construction, incorrectly chosen mesh size, and certain morphological features of ... some Antarctic fish, which make it difficult for them to escape from the codend. Selectivity properties ... selection of Antarctic icefish and bumphead notothenia ranges from 60 to 100 mm. For other Antarctic fish ... were much better. It was found that an optimum mesh size of this codend for selection of Antarctic ... calculated as a mean from 30 measurements. For investigations, only those tows were selected which ... , separately for various codends. On the basis of measurements of the length of all fish, separately for the ... - slightly over 50%. On South Georgia fishing grounds, the same was true for fish of up to 35 cm in length ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 1-48 : Автор(ы): Zaucha, J.

3. Krill fishing in the Scotia Sea in relation to bathymetry, including the detailed distribution around South Georgia

   the fishery was restricted in that period to an area on the western edge of the shelf break where ... on fine-scale (0.5 o latitude x 1 o longitude) data show that harvesting in the Scotia Sea has been ... mainly in shelf and shelf-break areas on the northern side of the Scotia Arc. Regional analyses reveal ... interannual variability in the distribution of trawls. The data for 1993 were only available from August but ... the fishery was restricted in that period to an area on the western edge of the shelf break where ... fishing for harvesting to be managed using an ecosystem approach. To this end it would be valuable to ... positional data were loaded into an Arc/Info 7.2 (ESRI) GIS. The system includes information on the ... Islands the major area fished was to the north and west, again on the shelf-break areas (Figure 3). An ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 1–17 : Автор(ы): Murphy, E.J., P.N. Trathan, I. Everson, G. Parkes and F.H.J. Daunt

4. Food consumption by predators in a CCAMLR integrated study region

   / Description:  A detailed description of the structure and mode of operation of a model for estimating food ... Georgia Integrated Study Region and incorporates new features, allowing for seasonal variation in predator ... existing empirical data on breeding population size, diet, activity-specific energy requirements and ... two breeding attempts in three years at South Georgia. Thus the estimation procedure is based on an ... activity cycle (365 for most species, 730 for species whose cycle lasts two years, and 1 095 for king ... energy requirement on each day of the year for each species in the community. Because the sizes ... Group for the CCAMLR Ecosystem Monitoring Program (WG-CEMP) for Members to synthesize data on predator ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 489–519 : Автор(ы): Croxall, J.P., C. Ricketts and A.G. Wood

5. Significant conservation benefits obtained from the use of a new fishing gear in the Chilean Patagonian toothfish fishery

   artisanal trotline fishery for Patagonian toothfish (Dissostichus eleginoides) in Chile is described. The ... modified artisanal system, which includes a net sleeve that is placed on secondary vertical lines, has ... sperm and killer whales on fish catch rate was assessed during September–December 2006. The results were ... the line. During the last five years in the Chilean long- line fishery for toothfish, strong ... an evaluation, carried out during the 2006 tooth- fish fishing season, are described together with a ... ~70–74 cm Ø~30 cm Ø~10–15 cm ~100–120 cm Hooks Snoods ~20 cm ~15 cm ~25 cm Weight 4–8 kg ... 2006 season, when fishers began to use the new system, an experiment to assess the effects on seabird ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 79–91 : Автор(ы): Moreno, C.A., R. Castro, L.J. Mújica and P. Reyes

6. Seabird mortality in the Patagonian toothfish longline fishery around Crozet and Kerguelen Islands, 2001–2003

   and relating to fishing techniques) have an effect on the observed numbers of seabirds caught ... breeding season, except for giant petrels. The highest mortality of white-chinned petrels, grey petrels ... baited longlines. Based on the results of this analysis, several recommendations are made with the aim of ... petrels and grey petrels is explained by the time of year, geographical area and type of longliner (manual ... for the two years, and is linked to the repro- ductive cycle of the species most frequently caught ... populations, based on the mean by-catch rate for the year 2001/02 (highest rates) compared to the size of ... and relating to fi shing techniques) have an effect on the observed numbers of seabirds caught ... Introduction Seabirds form an integral part of marine eco- systems. They depend entirely on the resources of ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 53–80 : Автор(ы): Delord, K., N. Gasco, H. Weimerskirch, C. Barbraud and T. Micol

7. Commercial krill fisheries in the Antarctic, 1973 to 1988

   :  STATLANT data reported to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR ... ) are used to discern observable trends in catch and effort for the Antarctic krill (Euphausia superba ... split-years; a split-year being the twelve month period from 1 July in one year to 30 June in the next ... . The catch year is designated according to the second of the two split-years. Krill ST ATLANT data ... major krill fishing nations, together accounting for about 99% of all catches. 2.2.2 Annual Catch By ... /84 catch in these two subareas closely resembles the overall trend for Statistical Area 48 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 229–281 : Автор(ы): Miller, D.G.M.

8. Identifying taxonomic groups vulnerable to bottom longline fishing gear in the Ross Sea region

   the fishery being assessed. New Zealand identified an interim list of taxa to monitor in fishery by ... -catch in the Ross Sea as part of its benthic fisheries impact assessment. The rationale for including or ... , including two indicator-only taxa. File:  05parker-bowden.pdf ... , which is dependent on the structuring organisms. To provide a scientific basis for developing an ... : (L = <10 years; M = 10–30 years; H = >30 years) Growth rate: (L = mature <10 years; M = mature 10–20 ... years; H = mature >30 years or evidence for sporadic recruitment events) Fragility: (L = Flexible ... live longer than the 30 years estimated for more shal- low species (McFadden, 1991; Cordes et al ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 105–127 : Автор(ы): Parker, S.J. and D.A. Bowden

9. Champsocephalus gunnari stock status in the South Georgia area

   intensity was F 0.1. In the first two cases TAC=25-30 thousand tonnes and stock size does not change. For ... recruitment was taken at the lowest possible level for all these years (400 million specimens). Catch-per-unit ... / Description:  ata of age composition and fishing effort for 1976/77-1987/88 were used to analyse stock status ... and TAC for C. gunnari. Stock estimates were obtained using VPA with the following variations: mean F ... was FO.1• In the first two cases TAC=2S-30 thousand tonnes and stock size does not change. For the ... , using F regression on fishing effort and method of average weighted F. For 1986/87 the values ... possible level for all these years (400 million specimens). Catch-per-unit-effort was also taken at the ... individuals). Biomass (thousand tonnes). Stock status and T AC prediction if F is an average value for the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 1-18 : Автор(ы): Borodin, R. and P. Kochkin

10. Using ecosystem monitoring data to detect impacts

    impacted by activities such as fishing. This paper discusses a range of methods for inferring such impacts ... an observed value in an unimpacted system, or (ii) the frequency of values below a fixed reference ... point. The second approach allows inference criteria based on changes in this frequency rather than by ... within a few years of its onset, but a fixed reference point method could have provided this sustained ... : Method 4 with inference based on changes in frequency: the observed proportion of years in an n-year ... two out of three successive years. The reference period for Method 3 was also three years. Results ... anomaly as an impact (albeit based on only two observations). Even the higher reference points identify ... if at ≤ acrit in two or more years of a four-year refer- ence period. Summary of methods: anomalies ...

    Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 197–212 : Автор(ы): Hill, S.L., J. Forcada, P.N. Trathan and C.M. Waluda

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