Resultados de la búsqueda

1. Age and growth of the Antarctic skate (Amblyraja georgiana) in the Ross Sea

   ages at maturity of 6–7 years for males and 8–11 years for females. These estimates are near the middle ... been validated. The maximum estimated age was 14 years, but this should be regarded as a conservative ... no obvious difference in growth between the sexes, so the von Bertalanffy curve for both sexes ... ]), where L t is the pelvic length (PL) in centimetres at age t years. Applying this growth curve to the ... and capture. An increase of 0.5 years for all age estimates would move the growth curve suffi ... –7 years for males and 8–11 years for females. These estimates are near the middle to upper end of ... lengths of 4.3 and 4.6 mm compared with an expected length of about 8 mm. Possible explanations for this ... 12 years for males and 14 years for females (Figure 4). Growth curves Von Bertalanffy growth ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 183–194 : Autor(es): Francis, M.P. and C. Ó Maolagáin

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

   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 ... the South Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989 ... conducted during daylight hours. The target time for a haul was 30 minutes, with any haul less than 20 ... largely exhausted within two years, and overall catches declined by almost two orders of magnitude ... rapid declines of catch and catch rates led CCAMLR to impose a moratorium on all directed fishing for ... MATERIALS Sample strategies for all surveys examined were based on random stratified designs. Sampling ...

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

3. Assessment of krill flux factors in waters of South Orkney Islands during summer 1996

   1996 Abstract / Description:  This paper describes the results of an experiment conducted from 19 ... a product of two variables integrated over the depth range 0 to 200 m: krill density (g/m 3) and ... periphery of ACC. Based on estimations of krill density and geostrophic velocities obtained during the ... for calculating actual total biomass of krill I n recent years , m o s t s t u d i e s a i m e d ... boundaries, both to be -0.05 S,, based on values of 0.77 S , for in terms of the amount of transported ... . Devitsin for their assistance. REFERENCES Everson, I. and de la Mare W. 1996. Some thoughts on ... describes the results of an experiment conducted from 19 February to 7 March 1996 to assess krill flux ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 195–204 : Autor(es): Kasatkina, S.M., V.N. Shnar, M.I. Polischuk, A.M. Abramov and V.A. Sushin

4. Analyses of acoustic line-transect data from the waters around South Georgia: estimation of krill (Euphausia superba Dana) – biomass

   155 786 km 2 was estimated to be 1.8225 x 10 6 tonnes (Coefficient of Variation = 9.5%). This gives an ... Analogue echo-integrator was used for the study. The echosounder was calibrated on 22 November and 23 ... . An estimate of the mean bottom depth was available for each section. The CTD profiles collected at ... estimation of variance on this basis meaningless. For the variance of the final estimate to be a minimum ... was obtained for an area approximately 1.63 x 105 km2, which compares with the 1.56 x 105 km2 used in ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 225–243 : Autor(es): Murphy, E., I. Everson and A. Murray

5. Protecting young fish and spawning aggregations of Champsocephalus gunnari in Subarea 48.3 (South Georgia): a review

   , and a strategy for the future protection of young fish and spawning aggregations of C. gunnari in ... of each year and end on 30 November of the fc%owing year. References SC-CAMLR, 1984, para raphs ... discussed in depth by the Scientific Committee nor its Working Group on Fish Stock Assessment (WG-FSA) for ... , paragraphs 9.1 and 9.2). This runs from 1 December to 30 November, and has specific implications for the ... also be imposed for short-lived, fast-growing species, where the fishery concentrates on a single ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 75–86 : Autor(es): Parkes, G.B

6. Environment–krill relations in the South Georgia marine ecosystem

   variability and it is only recently that physical datasets have been generated for the Southern Ocean. In this ... northeastern Scotia Sea around South Georgia for the period from 1974 to 1992. These indices were examined in ... be a useful index for some regions. Associations with ice-edge position and atmospheric components ... were only expressed strongly in years of extreme conditions. The correlation with water temperature was ... longitudes 20°, 30°, 40' and 50°W. For the period 1973 to 1989, a further sea-ice dataset was available ... the manuscript and Dr J.P. Croxall, Prof. Antezana and Dr S. Nicol for valuable comments on an ... : (a), (b), (c) - in the same year; (d) - ice-edge position at 30°W averaged for December-January and ... varied greatly between years. The very high values obtained for the mean number of fishing days during ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 13–30 : Autor(es): Fedoulov, P.P., E. Murphy and K.E. Shulgovsky

7. Variations in condition indices of mackerel icefish at South Georgia from 1972 to 1997

   predominantly on krill. An index of condition which uses the ratio of the measured total mass to the estimated ... 1997 Abstract / Description:  Mackerel icefish (Champsocephalus gunnari) are widespread on the South ... in krill availability. Condition index provides a useful proxy for krill density and is likely to be ... account for 20% of the total mass (Kock, 1992; Everson et al., 1996). Arising from this, we envisage two ... were used to derive an estimated mass for each fish ( and K,,). Two condition indices were calculated ... except the two months prior to spawning. Depending on locality, that will mean that except for the ... commercially since the early 1970s. They are known to feed predominantly on krill. An index of condition which ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 119–132 : Autor(es): Everson, I. and K.-H. Kock

8. Experimental evaluation of the effectiveness of weighting regimes in reducing seabird by-catch in the longline toothfish fishery around South Georgia

   effects of different weighting regimes on the incidental mortality of birds caught on longlines fishing ... for toothfish (Dissostichus spp.). Three regimes were examined, with weights of 4.25, 8.5 and 12.75 kg ... attached at 40 m intervals on a Spanish-rigged longline. There was a significant reduction in bird ... intervals should be used. Results suggested that seabird by-catch on lines using effective weighting regimes ... which has participated in the longline fishery around South Georgia for the past several years, and ... (cobbles) of an average weight of 4.25 kg. Two experiments were conducted: (i) a comparison of the use ... problem, but whether it would be for other vessels in other areas might depend on the seabed substratum ... between the two sets of double-weight lines. The total number of birds caught on double-weight lines was ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 119–131 : Autor(es): Agnew, D.J., A.D. Black, J.P. Croxall and G.B. Parkes

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

   austral summers of 1991/92 and 1992/93 are described and compared with information from previous years ... other years appears to be associated with female maturity development and spawning during the early ... . 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 ... major difference between the two years was the abundance of salps (Salpa thompsoni - Table 1 ... . Loeb and Siege1 (Dlink/Dmax) *l00 Variable 1---10---20---30---40---50---60---70---80---90---~00 ST ... ST-4 3 ST-59 -7 ST-58 -L ST-71 ST-4 4 ST-72 (Dlink/Dmax)*100 Variable 1---10---20---30---40 ... (clusters 1 to 3) during January 1992. Cluster 1 N = 863 10 15 20 25 30 35 40 45 50 55 6 0 Total ...

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

10. Some specific features of the USSR krill fishery and possibilities of applying fishery statistics to studies of krill biology and stocks

    the vessel rather than with krill abundance in a certain area. During preparations for regular fishing ... operations very short hauls (under 15 minutes) are practised. Such fishing practice, together with ... -term behaviour patterns have an impact. All these factors limit the extent to which CPUE can be used in ... instrument for studies. File:  04-Dolzhenkov-et-al.pdf ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 237–252 : Autor(es): Dolzhenkov, V.N., T.G. Lubimova, R.R. Makarov, S.S. Parfenovich and V.A. Spiridonov

Páginas