Search results
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Analyses of acoustic line-transect data from the waters around South Georgia: estimation of krill (Euphausia superba Dana) – biomass
Paper Title: Analyses of acoustic line-transect data from the waters around South Georgia ... : estimation of krill (Euphausia superba Dana) – biomass Abstract / Description: A large-scale acoustic survey ... of zooplankton stocks in the waters around South Georgia was carried out during November and December ... 1981. The data have been analysed using various definitions of strata. The total biomass in the area of ... at random to reduce the possibility of systematic errors. Each transect was divided into six ... (MVBS). 226 At the end of each section various 'station' activities were carried out as part of ... -107.8 Pulse duration was measured at 0.6 msec. Not all of the acoustic targets will have been krill ... . An estimate of the mean bottom depth was available for each section. The CTD profiles collected at ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 225–243 : Author(s): Murphy, E., I. Everson and A. Murray
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Distribution and relative abundance of juvenile icefish (Champsocephalus gunnari) from a trawl survey of the South Georgia shelf in June–July 1985
Paper Title: Distribution and relative abundance of juvenile icefish (Champsocephalus gunnari ... ) from a trawl survey of the South Georgia shelf in June–July 1985 Abstract / Description: A trawl ... survey of the distribution and relative abundance of juvenile icefish (Champsocephalus gunnari) in South ... juvenile trawl of 13.6 m. The size range of juvenile icefish collected was 82–146 mm. Catches were the ... -bottom (2-5 m off the sea-bed), mid-Water and near surface. The duration of each haul was 10 minutes at ... station at one location was sampled with 16 tows. * the term "stratum" refers to the shelf zone of ... of 16 hauls was conducted to study vertical distribution of the juvenile mackerel icefish at one ... . The day-time catches of juvenile fish were in general 8.5 times higher than those at night. This ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 55-63 : Author(s): Boronin, V.A., G.P. Zakharov and V.P. Shopov
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A balanced model of the food web of the Ross Sea, Antarctica
Paper Title: A balanced model of the food web of the Ross Sea, Antarctica Abstract / Description ... : A quantitative food web of the Ross Sea is presented here as a step towards investigating ecosystem ... effects of the fishery for Antarctic toothfish (Dissostichus mawsoni). The model consolidates quantitative ... information on trophic links across all the major biota of the Ross Sea and tests for data consistency. The ... of the Antarctic Slope Front (Jacobs, 1991) which, in part at least, hydrodynamically separates the ... Ross Sea (Norkko et al., 2004) is estimated to be unimportant to flows of material at the scale of ... of animals that died due to predation but were not consumed at the time; (v) transfers of biota ... ‘closest’ to the initial set of estimated parameters as defined below. The problem at this stage is non ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 1–31 : Author(s): Pinkerton, M.H., J.M. Bradford-Grieve and S.M. Hanchet
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Assessments of the stocks of Notothenia rossii marmorata and Champsocephalus gunnari in the South Georgia area
Paper Title: Assessments of the stocks of Notothenia rossii marmorata and Champsocephalus gunnari ... in the South Georgia area Abstract / Description: The stocks of Notothenia rossii marmorata and ... estimates from surveys by the FRG. These data indicate that the stock of N. rossii in 1985 was about 2.5% of ... its pre-exploitation biomass, while the stock of Champsocephalus gunnari has fluctuated greatly with ... survivorship schedule, a range of alternatives must be considered. At one extreme, the survival rate can be ... - stock in the latter part of the 1970's, give some indication of the sustainable exploitation rate at ... would imply a maximum sustainable yield of 45,000 tonnes per annum at a recruited stock size of ... length distributions of the USSR catch at age samples are very dissimilar from FRG samples on which the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 1-21 : Author(s): Cooke, J.G.
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Mesopelagic fish of the Southern Ocean - summary results of recent Soviet studies
on Biological Resources ofTalassobathyal Zone of the World Ocean, Rhybnoye, November 1988. Moscow. pp. 27-28 ... . In: Integrated Fishery-Related Studies ofVNIRO in the World Ocean. Moscow. pp. 19-43. (In Russian). MAZHIRYNA ... Paper Title: Mesopelagic fish of the Southern Ocean- summary results of recent Soviet studies ... a part of the general multi-disciplinary program of research on Antarctic biological resources ... are sufficient to allow a description of the general ecology and distribution of these species. Some ... recently published results of these studies. A general description of mesopelagic myctophids is followed by ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 433–457 : Author(s): Sabourenkov, E.N.
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Sources of variance in studies of krill population genetics
Paper Title: Sources of variance in studies of krill population genetics Abstract / Description ... : There has been a long-term interest in the population genetics of Antarctic krill species because of ... their ecological and economic importance. The possibility that there are distinct genetic stocks of ... these species would affect the design of management strategies for their conservation. A recent ... polymerase (Promega) and 10 pmol of each primer were included. The reactions had an initial incubation at ... 72ºC 1 min for 40 cycles. A 6 min incubation at 72ºC followed to fi nish synthesis of incomplete ... for each individual. 10 μL of each completed PCR amplifi cation was restriction digested at 37ºC ... s st ud ie s of t hr ee k ri ll sp ec ie s. A ll st ud ie s to d at e us e ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 107–116 : Author(s): Jarman, S.N. and S. Nicol
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Comparison of age readings from scales and otoliths of the Patagonian toothfish (Dissostichus eleginoides) from South Georgia
Paper Title: Comparison of age readings from scales and otoliths of the Patagonian toothfish ... compared for 105 specimens of the Patagonian toothfish (Dissostichus eleginoides) from the South Georgia ... region (Subarea 48.3). In 44% of specimens, age readings from both structures were identical. A Wilcoxon ... appropriate for determining the age of D. eleginoides because it does not underestimate age and is the most ... otoliths were attached to one piece of board, which were then sectioned at very low speed using a Isomet ... : where 1, is the length of an individual fish at age t; n, is the random variable which represents the ... ,) = oh2 for each age t ; g(t,@) is the growth model and represents the mean length at age t of the ... ) = E (ELIt) (average of all individuals at age t), 0 is the vector of parameters of h. If it is ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 191–203 : Author(s): Cassia, M.C
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A simulation study of the method of deriving natural mortality rate using data for Champsocephalus gunnari in Subarea 48.3
Paper Title: A simulation study of the method of deriving natural mortality rate using data for ... Champsocephalus gunnari in Subarea 48.3 Abstract / Description: A method of determining the rate of natural ... mortality, based on the construction of a regression between the rate of annual fishing mortality ... (determined by VPA) and fishing effort is described. The intersect of this regression must be equal to zero if ... verifying the natural mortality rate calculation held at the meeting of the WG-FSA (CCAMLR, 1990) indicated ... relationships of abundance dynamics N - N (-za,y) a+ 1,y+ 1 - a,ye where Sa is selectivity at age a ; Fy ... = 0, am = age at first maturity; where Cl> is an expression which describes dependence of ... weight-at-age (and fishing year); Na,O - distribution of abundance by age during the zero fishing year ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 69–83 : Author(s): Gasyukov, P.S. and R.S. Dorovskikh
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Assessment of krill flux factors in waters of South Orkney Islands during summer 1996
Paper Title: Assessment of krill flux factors in waters of South Orkney Islands during summer ... 1996 Abstract / Description: This paper describes the results of an experiment conducted from 19 ... ) was located in the zone of interaction between waters of the Antarctic Circumpolar Current (ACC) and ... in the past. The geostrophic transport of krill across boundaries of the study area was calculated as ... density profiles, both integrated over the depth range from 0 to 200 m at a resolution of 1 n mile of ... the study area at a speed of 8 knots, starting from the northeastern corner, to estimate parameters ... target strength was estimated at an operating frequency of 120 kHz using the following regression (SC ... 15 at points of water outflow away from the study area (Figure 2, Table 1). The dynamic structure ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 195–204 : Author(s): Kasatkina, S.M., V.N. Shnar, M.I. Polischuk, A.M. Abramov and V.A. Sushin
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Areal and seasonal extent of sea-ice cover off the northwestern side of the Antarctic Peninsula: 1979 to 1996
Paper Title: Areal and seasonal extent of sea-ice cover off the northwestern side of the ... Antarctic Peninsula: 1979 to 1996 Abstract / Description: Analysis of seasonal sea-ice cover of an area ... measuring 1.25 x 10 6 km 2 off the northwestern side of the Antarctic Peninsula indicates that there were ... four periods of extensive ice cover during the last 18 years. Variability in seasonal timing, areal ... between krill reproduc- tion, survival at early-life stages and sea-ice cover, the indices of ice cover ... June-July 1991 * NSIDC Distributed Active Archive Center, University of Colorado at Boulder, sidc ... EXTENT OF SEA-ICE COVER OFF THE NORTHWESTERN SIDE OF THE ANTARCTIC PENINSULA: 1979 TO 1996 R.P. Hewitt ... Southwest Fisheries Science Center PO Box 271, La Jolla CA 92038, USA Abstract Analysis of seasonal ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 65–73 : Author(s): Hewitt, R