Résultats de la recherche

1. Characteristics of krill aggregations in the South Sandwich Islands subarea in January–February 2000

   biomass is shown. About 64% of the krill biomass was concentrated in krill swarms in the upper 80 m depth ... 20 00 19 83 19 90 Po te nt ia l F is hi ng G ro un d s (J an ua ry ... horizontal density (over 20 g m-2) was related to krill swarm concentrations within the 15–80 m depth layer ... be r 19 84 Ja nu ar y 19 85 M ea n d ep th r an ge (m ) 70 80 80 50 62 44 .0 ... with densities greater than 20 g m-2, formed by swarm fi elds distributed within the 0–80 m layer ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 145–164 : Auteur(s): Kasatkina, S.M., A.P. Malyshko, V.N. Shnar and O.A. Berezhinsky

2. Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990

   these large hauls were considered in the analysis. No ideal method was found for incorporating the large ... series. All hauls were intended to last for 30 minutes at a speed of 3 to 3.5 knots. Hauls were ... mentioned above and it was concluded that they were responsible for the major difference between the ... .... 18 Remainder of South Georgia 150 to 250 m stratum 190623 (N=12) 18271 (N=20) Total biomass for ... (30) 0 0 D. eleginoides 335 (39) 3020* (33) 9631 (55) 1693 (21) P.b. guntheri 0 0 13 608 (90) 1918 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 223–254 : Auteur(s): (Report of a Joint UK/USSR Workshop, 23 to 27 July 1990)

3. Status of the krill stock around Elephant Island in 1991/92 and 1992/93

   . The length frequency distributions and maturity stage composition reflected relatively good year class ... success from the 1990/91 spawning season but poor success from 1991/92. Year class success from these and ... appeared to be affected by dense salp concentrations during 1992/93 and 1989/90. File:  02loeb-siegel.pdf ... austral summers of 1991/92 and 1992/93 are described and compared with information from previous years ... . Loeb and Siege1 (Dlink/Dmax) *l00 Variable 1---10---20---30---40---50---60---70---80---90---~00 ST ... . Frequency % 12 "l l0 l6 20 26 30 36 40 46 60 66 80 Total Length (mm) Frequency % 10 16 90 26 SO S6 ... maturity development during early summer is an important factor influencing year class success, due to ... recruitment for the 1991/92 year class. The apparent failure of the 1991/92 year class supports this ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 7–33 : Auteur(s): Loeb, V. and V. Siegel

4. Changes in biomass of eight species of finfish around the South Orkney Islands (Subarea 48.2) from three bottom trawl surveys

   the South Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989 ... /90. The biomass of several species of finfish has been monitored through scientific bottom trawl ... were computed for the eight species of finfish which were most abundant in catches. Biomass levels and ... of recovery for N. rossii. However, overall levels of biomass indicate very little potential for ... conducted during daylight hours. The target time for a haul was 30 minutes, with any haul less than 20 ... Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989/90. The ... increase in point estimate biomass levels for this species suggests an increase in population levels from ... there was an apparent decrease in biomass for all other species in 1999, particularly C. gunnari. The ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 53–74 : Auteur(s): Jones, C.D., K.-H. Kock and E. Balguerías

5. Evaluation of the results of trawl selectivity experiments by Poland, Spain and USSR in 1978/79, 1981/82 and 1986/87

   in 1978/79, 1981/82 and 1986/87 Abstract / Description:  Trawl selectivity for several species of ... rates and catch composition. Details of these data were analyzed and minimum mesh sizes for several ... species were calculated. It is recommended that introduction of these mesh sizes should be considered for ... mm, to protect first spawners, or 100 mm, to give an age at first capture of 4 years; (ii) Fishery ... 23.6 cm. Lso values of 30 cm for mesh size 124 mm (Table 9) and of 29.4 cm for mesh 110 mm (Table 11 ... considered: ( a) Subarea 48.3 (i) Fishery targeted at C. gunnari 80 mm, to protect immature fish, or 90 ... Georgia. Fisch - Forsch., 20 (2): 49-53. KOCK, K.-H. 1981. Fischereibiologishe Uutersuchungen an drei ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 163–196 : Auteur(s): Slosarczyk, W., E. Balguerias, K. Shust and S. Iglesias

6. Champsocephalus gunnari stock status in the South Georgia area

   / Description:  ata of age composition and fishing effort for 1976/77-1987/88 were used to analyse stock status ... 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 ... 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 ... C12ellHHH: B0312acT 2 90 2 20 2 60 3 60 1980/81 1981/82 1982/83 1983/84 17,02 5,87 25,97 98,63 71,49 ... individuals). Biomass (thousand tonnes). Stock status and T AC prediction if F is an average value for the ... possible level for all these years (400 million specimens). Catch-per-unit-effort was also taken at the ...

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

7. Geographical differences in the condition, reproductive development, sex ratio and length distribution of Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica (CCAMLR Subarea 88.1)

   South shelf North South break South shelf 100 90 80 70 60 50 40 30 20 10 0 North South break ... Fulton’s condition index (K) has been calculated for the five sampling seasons. This index assumes an ... with a 30 cm range over maturity (i.e. 85–115 cm TL). This equates to 50% maturity at about age 9. As ... . Table 4 shows the overall ratio of females to the total catch-weighted sample for each year from each ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 27–45 : Auteur(s): Fenaughty, J.M

8. Size at sexual maturity of Patagonian toothfish (Dissostichus eleginoides)

   (Dissostichus eleginoides) caught in the commercial fishery within Subarea 48.3. The results for 1996 indicate ... that L m50 occurs at 78.5 cm total length for male and 98.2 cm for female fish. In 1997 the results for ... male fish were essentially the same. For female fish there is evidence that in 1997 a significant ... allowing for this bias indicates that L m50 for female fish in 1997 was no different to that for 1996. The ... leading to an enlarged ovary of about 20% of the fish total mass. Spawning occurs in the period July to ... fit logistic models with an additional parameter for non-response (usually called 'immunity' in the ... language of bioassay - see Finney, 1978, Chapter 20) to cater for the situation where a proportion (propn ... errors) for 'spawners' based on an upper asymptote of l-propn. An estimate of population L,,,, (with ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 37–46 : Auteur(s): Everson, I. and A.W. Murray

9. Krill biomass in Area 48 and Area 58: recalculations of FIBEX data

   estimates of mean density and biomass for the Indian Ocean sector and the West Atlantic sector as well as ... for FAO Statistical Area 41, and CCAMLR Subareas 48.1, 48.2, 48.3, 48.6 and Division 58.4.2. Density ... workshop. Estimates for the different areas were also calculated using the target strength relationships of ... Green et al. (1990). The new estimates were on average 4.76 times larger than the old estimates for ... densities reported in Anon. (1986) were derived using a TS value of -68.10 dB for a mean animal length of ... - equation 3) to provide an estimate for transect density (Pk). The mean density by stratum (PA) weighted by ... laill for an interval (set either on the basis of time or on distance steamed) of ship's track was ... 3S'W 30'W 2S'W 20'W 1S'W r-------------------------~------------~------t_SO'S ...... 00 '1 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 157–181 : Auteur(s): Trathan, P.N., D.J. Agnew, D.G.M. Miller, J.L. Watkins, I. Everson, M.R. Thorley, E. Murphy, A.W.A. Murray and C. Goss

10. Assessments of by-catch in trawl fisheries at Heard and McDonald Islands

    / Description:  This paper assesses the potential for the commercial trawl fisheries in the Heard Island area ... skates). The long-term annual yield for each of the three taxa was estimated using the generalised yield ... from the local area. Where possible, values for missing input parameters were obtained from the ... literature, for the same species from other areas, otherwise proximate data for similar species elsewhere in ... than 0.1 over a 20-year period. The lowest y satisfying these rules was determined for the three ... 0 20 0.2 for C. rhinoceratus WG-FSATWG-FSA-97/30). L. squainifrons 1 25 11 360 0.1 ... length at which the fish are fully represented in the sample (considered - to be Estimates of age for ... old. The maximum age is uncertain because it is currently based on an estimate from one fish. Also ...

    Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 231–243 : Auteur(s): Constable, A.J., R. Williams and W.K. de la Mare

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