Résultats de la recherche
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Statistical problems in krill stock hydroacoustic assessments
method is most appropriate, this is made even more difficult by the fact that most survey methods assume ... non-stationary populations, which have not been well addressed by present techniques. However, this ... difficult by the fact that most survey methods assume the population is fixed in space, relative to the ... well addressed by present techniques. However, this does not invalidate the use of available methods ... estimates of abundance by depth and distance along a survey track. These relative estimates of abundance ... by adjusting the estimate by the ratio of the old and new target strengths. Surveys are conducted ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Auteur(s): Macaulay, M.C.
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Notes on the use of virtual population analysis for stock assessment of the mackerel icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons
techniques, from 1991 back to 1977. The predicted age structure, dominated in recent years by the 1987 year ... is recommended, based on the results of surveys by Falklands Protector in 1990/91 and 1991/92. File ... . The predicted age structure, dominated in recent years by the 1987 year-class (1 year olds in 1988 ... the results of surveys by Falklands Protector in 1990/91 and 1991192. Resume Suite a l'apparente ... stock size in 1990/91, all of these VPAs indicated that the biomass that year was dominated by 4 year ... distribution estimated by the VPA for that year (Figure 1). Concern was expressed at WG-FSA-91 that the large ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 49–79 : Auteur(s): Parkes, G.
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Using ecosystem monitoring data to detect impacts
impacted by activities such as fishing. This paper discusses a range of methods for inferring such impacts ... point. The second approach allows inference criteria based on changes in this frequency rather than by ... indicate the state of ecosystems and whether they have been impacted by activities such as fishing. This ... inference criteria based on changes in this frequency rather than by reference to a critical probability ... assessed by reference to a control population. Developing man- agement strategies that use uncontrolled ... ongoing chal- lenges faced by CCAMLR is to develop a manage- ment strategy for the krill fishery which ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 197–212 : Auteur(s): Hill, S.L., J. Forcada, P.N. Trathan and C.M. Waluda
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Killer whale (Orcinus orca) and sperm whale (Physeter macrocephalus) interactions with longline vessels in the Patagonian toothfish fishery at South Georgia, South Atlantic
fishing operations were recorded by CCAMLR observers between 2000 and 2002 at South Georgia (Subarea 48.3 ... areas with lower catch rates, indications are that depredation by sperm whales can lead to a decrease in ... catches. Some mitigation measures have been tried by vessels to reduce interactions with cetaceans ... operations were recorded by CCAMLR observers between 2000 and 2002 at South Georgia (Subarea 48.3). Demersal ... (toothfi sh). However, in areas with lower catch rates, indications are that depredation by sperm whales ... can lead to a decrease in catches. Some mitigation measures have been tried by vessels to reduce ... islands and seamounts, mostly within waters regulated by CCAMLR. This fi sh ery is currently the most ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 111–126 : Auteur(s): Purves, M.G., D.J. Agnew, E. Balguerías, C.A. Moreno and B. Watkins
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Biological characteristics of Antarctic fish stocks in the southern Scotia Arc region
catches. The only scientific surveys of these stocks during these years were conducted by Germany in 1985 ... , and by Spain in 1987 and 1991. More recently, the US Antarctic Marine Living Resources (US AMLR ... Antarctic or peri-Antarctic species predominated in the fish fauna. Species groups differed by up to 55-60 ... sample these catches. The only scientific surveys of these stocks during these years were conducted by ... Germany in 1985, and by Spain in 1987 and 1991. More recently, the US Antarctic Marine Living Resources ... differed by up to 55-60% from one shelf area to the other, mostly due to differences in the abundance of ... Kock et al. INTRODUCTION Antarctic waters have been commercially exploited by trawl fishing since ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 1–41 : Auteur(s): Kock, K.-H., C.D. Jones and S. Wilhelms
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Areal and seasonal extent of sea-ice cover off the northwestern side of the Antarctic Peninsula: 1979 to 1996
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 ... years is apparent and is consistent with features described by Stammerjohn and Smith (1996) for ice ... 1995 and were foreshadowed by the late retreat of ice during the springs of 1985, 1990 and 1994. Ice ... ; Fraser and Trivelpiece, 1996; Loeb et al., in press) . These suggestions followed comments by many ... produced by the US Navy-NOAA Joint Ice Center (JIC), and surface air temperatures to infer sea-ice cover ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 65–73 : Auteur(s): Hewitt, R
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Precautionary spatial protection to facilitate the scientific study of habitats and communities under ice shelves in the context of recent, rapid, regional climate change
both ecological processes and in community structure. Habitats revealed by collapsed ice shelves ... one of the recommendations made by the Antarctic Treaty Meeting of Experts in 2010. File: Trathan et ... such changes, primarily in the absence of any effects caused by other human activities. In this ... changes in both ecological processes and in community structure. Habitats revealed by collapsed ice ... would fulfil one of the recommendations made by the Antarctic Treaty Meeting of Experts in 2010 ... air being brought over the peninsula by the stronger westerlies forced by changes in the Southern ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 139–151 : Auteur(s): Trathan, P.N., S.M. Grant, V. Siegel and K.-H. Kock
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Trends in relative abundance of fjord Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps at Potter Cove, South Shetland Islands, after commercial fishing in the area
results are supported by our knowledge about the diet of the piscivorous Antarctic shag (Phalacrocorax ... by the offshore commercial fishery in the area in the late 1970s. This interpretation is consistent ... . gibberifvons are well below those found in the early 1980s. These results are supported by our knowledge about ... . rossii and G. gibberifions over the last 16 years was most probably caused by the offshore commercial ... ), conservation measures have been adopted in order to assist the recovery of these species by banning directed ... fisheries and establishing stringent by-catch limits. Commercial fishing in the South Shetland Islands ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 43–52 : Auteur(s): Barrera-Oro, E.R., E.R. Marschoff and R.J. Casaux
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Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean.
investigated using biological data collected by a Japanese commercial fishing vessel during the austral summer ... two species by depth may be related to physical intolerance to cooler temperatures because of the lack ... investigated using biological data collected by a Japanese commercial fishing vessel during the austral summer ... of the two species by depth may be related to physical intolerance to cooler temperatures because of ... sexual maturity of these two species of toothfish on BANZARE Bank, using biological data collected by a ... the seafloor at depths ranging from 630 to 1 960 m. Haul-by-haul catch and effort data and biologi ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 145–153 : Auteur(s): Taki, K., M. Kiyota, T. Ichii and T. Iwami
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Potential impacts of bottom trawling on benthic communities in Prydz Bay, Antarctica
demersal finfish species in Prydz Bay by Australia in the 1990/91 season. The data collected are used to ... demonstrate that the biomass of benthos that could be disturbed by commercial bottom trawling could be high in ... data on benthos retrieved in bottom trawls during a survey of demersal finfish species in Prydz Bay by ... benthos that could be disturbed by commercial bottom trawling could be high in Prydz Bay. Also, the ... finfish species in Prydz Bay by Australia in the 1990/91 season. The results are used to examine the ... the bottom bridle was 10 m. Disturbance of the benthos was caused by the bobbin gear, bridle and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 403–410 : Auteur(s): Constable, A.J.