Résultats de la recherche

1. Effects of different harvesting strategies on the stock of Antarctic icefish Champsocephalus gunnari around South Georgia

   Champsocephalus gunnari have been simulated for a period of 30 years. These were- diffierent levels of constant ... years after a good recruitment,- pulse fishing at an interval of 3 years with no fishing in between;- a ... of the incoming year class. An increaseof F, however, should not occur before 4 years after a good ... shift in partial recruitment values due to changes in net selectivity. For the projections recruitment ...

   Meeting Document : SC-CAMLR-VIII/BG/47 : Auteur(s): Delegation of Federal Republic of Germany

2. The biology, ecology and development of fishery management advice for the anomuran crabs at South Georgia (CCAMLR Subarea 48.3)

   of the development of a management regime for them. Finally it aims to highlight areas in which ... further research should be directed in order to provide information on which to base the most appropriate ... assessment and management methods in light of continuing interest in the regional crab fishery. Considerable ... gaps in our knowledge of the biology, ecology and demography of the lithodid species at South Georgia ... storage. Moulting (and therefore mating) in P. spinosissima has been observed year-round but may be ... . Very small P. spinosissima (~ 20 mm CL) have occasionally been caught in demersal survey trawls on ... then raised by the total fishable area in Subarea 48.3 between 200 and 1 000 m depth (SC-CAMLR, 1992 ... . Lovrich, S. Thatje, U. Nettelmann and K. Anger. 2005. First year growth in the lithodids Lithodes ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 1–15 : Auteur(s): Belchier, M., T. Peatman and J. Brown

3. Histological study on the ovarian development of mackerel icefish (Champsocephalus gunnari) from the South Georgia Islands

   individuals (45%) was found, together with a relatively low occurrence of females that spawned or were in ... on ovarian development in Champsocephalus gunnari caught by the RV Dr Eduardo L. Holmberg in the ... South Georgia and Shag Rocks areas in February and March 1994. Six phases of oocyte development were ... to a regression stage. In some cases these ovaries presented few atretic oocytes; in others a ... the periphery, in contact with the oolema. The zona radiata increases in thickness (20 pm), showing ... the specimens ranged from two to five years, estimated from the age/length key presented in Barrera ... histological analysis was carried out on ovarian development in Charnpsocephalus gunnari caught by the RV Dr ... Eduardo L. Holrnberg in the South Georgia and Shag Rocks areas in February and March 1994. Six phases of ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 35–49 : Auteur(s): Macchi, G.J. and E.R. Barrera-Oro

4. Results from the 2019 annual acoustic krill monitoring off the South Orkney Islands

   surveys from 2011 to 2018. The distribution was similar to previous years with most krill along the shelf ... Abstract:  In 2019, the annual IMR regional krill monitoring survey off the South Orkneys was ... present the results from the 2019 regional survey processed and analysed in the same way as the annual ... the second lowest on record, indicating a less patchy krill distribution than a typical year.  Author ...

   Meeting Document : WG-EMM-2019/69 : Auteur(s): G. Skaret, B.A. Krafft, G. Macaulay, T. Knutsen and O.A. Bergstad

5. Fishery Report: Dissostichus eleginoides and Dissostichus mawsoni South Sandwich Islands (Subarea 48.4)

   -at-length proportions and the mean weight of the fish. 20. In each year, the length frequencies of ... and 30 tonnes for Dissostichus spp. in Subarea 48.4 South TOT 48.4 4 Weighted Frequency ... recruitment of a new strong year class into the fishery (70–80 cm length class). This was also observed in ... size of this year class before it has fully recruited in to the fishery. TOT 48.4 7 Figure ...

   Document : Site Section: Publications

6. Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?

   index of a morphometric characteristic? Abstract / Description:  In sexually dimorphic species ... avoiding the necessity of sex determination. However, uncertainty in sex ratios can lead to considerable ... Type I and Type II errors. Lack of knowledge about the sex ratio between years makes combining the data ... equal variance and equal numbers of males and females in the sample. The first condition was met in ... varying success. Values of c and d in equation (1) together with the sample size required to be 80 ... * Abstract In sexually dimorphic species, morphometric characteristics have separate distributions for ... determination. However, uncertainty in sex ratios can lead to considerable Type I and Type II errors. Lack of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Auteur(s): Agnew, D.J.

7. Developing a Ross Sea region medium-term data collection plan

   , proposed medium term research objectives for the Ross Sea fishery for the next 5–7 years were developed in ... Abstract:  Data are collected for use in scientific research, the results of which are used to ... , prevention of changes or minimisation of the risk of changes in the marine ecosystem which are not ... of Antarctic marine living resources. Based on these goals and previous experience in the fishery ...

   Meeting Document : WG-FSA-10/32 : Auteur(s): S. Mormede and S. Hanchet (New Zealand)

8. Fishery Report: Dissostichus eleginoides and Dissostichus mawsoni South Sandwich Islands (Subarea 48.4)

   weight of the fish. 19. In each year, the length frequencies of releases and recaptures ranged from ... 20 to 220 cm in 10 cm length bins. 8 TOT 48.4 Data weighting 20. The appropriate effective ... constrained the estimated harvest rate in any year from exceeding a specified maximum, set at 1.0 (see the ... probability). (ii) Choose a yield γ2, so that the median escapement in the SSB over a 35-year period is 50 ...

   Document : Site Section: Publications

9. UPDATED KRILL RECRUITMENT DATA FOR THE ELEPHANT ISLAND REGION OF THE SOUTH SHETLAND ISLANDS, ANTARCTICA; 2002-2008

   , with low recruitment occurring during the intervening years. Significant differences in the ... derived from the CMIX procedure, and were also derived as a proportion of the <30 mm length class for ... day and night samples. All indices showed that high recruitment (R1) occurred in 2003 and in 2008 ... proportional recruitment indices occurred between legs within years indicative of the changing pattern of krill ...

   Meeting Document : WG-EMM-08/41 : Auteur(s): C. Reiss (USA)

10. Best practice seabird by-catch mitigation for Spanish-rig longline vessels with emphasis on line weighting regimes

    setting operations would involve a) setting longlines with weights 30 m apart (minimizes lofting in ... Abstract:  The Spanish system is used in a range of demersal and semi-pelagic longline fisheries ... autoline vessels, that are effective in reducing the mortality of white-chinned petrels, one of the world’s ... priority because Spanish system gear, while fast to deeper depths (10-20 m), is slow to clear surface ...

    Meeting Document : WG-FSA-06/22 : Auteur(s): G. Robertson (Australia), C.A. Moreno (Chile), B. Wienecke (Australia), P. Gandini (Argentina), G. McPherson (Australia) and J.-P. Seco Pon (Argentina)

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