Search results
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Mesopelagic fish of the Southern Ocean - summary results of recent Soviet studies
during the first two years of life were found to be 30 to 36 mm per year (Zaselskiy et al.,1985). Growth ... = 20.35 [i -eo.zs (t+O.t4>]. Mean natural mortality of 1.14 was calculated from one year's data ... an adequate supply of food both for young and adult fish throughout the year, together with specific features ... was calculated from one year's data on 2- to 4-year-old fish which comprised the bulk of catches (Konstantinova ... Abstract / Description: Since 1963, Soviet research on Antarctic mesopelagic fish has been carried out as ... a part of the general multi-disciplinary program of research on Antarctic biological resources ... . Studies concentrate primarily on the following four most abundant species: Electrona carlsbergi, Electrona ... data are available on their feeding, reproduction and age/length composition. The paper summarizes ...
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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Comparative feeding ecology of Patagonian toothfish (Dissostichus eleginoides) in the southwestern Atlantic
) was investigated in two offshore regions in the southwestern Atlantic: on the Argentinian continental shelf/slope ... between 46°-55°S and 60°-64°W, and around South Georgia between 53°-55°30' and 3°-45°W. The South ... Georgia area was divided into two zones: the shelf zone and deep-water zone. On the Argentinian ... continental shelf/slope, the length of D. eleginoides ranged from 30 to 95 cm total length (TL) which ... ~one6anacb B jJllana3OHe 30-95 CM, YTO COOTBeTCTBYeT CTanHH MOJ'IOAH. B o ~ p y r K ) X H O ~ re0preA ... ' 42'23' 36'30' 45'00' 60'54' 62"15' 60'18' 64'20' 60'19' 62'39' Study Area/Vessel South Georgia ... 42.9 30.5 75.0 1.9 1.9 86.5 100.0 76.2 69.5 100.0 0.8 0.8 20.1 23.8 17.1 25.0 2.9 2.9 22.7 ... 1.64 96.30 1.41 0.17 22.54 98.40 3.50 18.31 98.26 3.20 Males 90.2 1671 6.3 ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 105–124 : Author(s): García de la Rosa, S.B., F. Sánchez and D. Figueroa
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Beyond MSY: a consideration of definitions of management objectives
in Article II of the CCAMLR Convention. The criteria will depend on whether the main concern ... out in Article II of the CCAMLR Convention. The criteria will depend on whether the main concern ... thought of in two parts. For the first few months or years of life, as eggs, larvae or juveniles ... be sustained is one corresponding to full exploitation of the weaker year-classes - but a much less than full ... when strong year-classes are being replaced by weak ones. Conversely, the stock may increase when ... two parts, determining (usually from catch records) the size of this year's stock, and how much ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 299-322 : Author(s): Gulland, J.A.
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Options for allocating the precautionary catch limit of krill among small-scale management units in the Scotia Sea
that considerable refi nement of these estimates is possible. Qualitative conclusions are that: under the fi rst two ... in some of its traditional fishing grounds during years of low krill availability. Under all five options ... . Qualitative conclusions are that: under the fi rst two options a substantial portion (>65%) of the catch ... years of low krill availability. Under all five options there would be little effect on the existing ... SSMUs and the two Bransfi eld Strait SSMUs could vary from year to year depending on the value ... -pelagic SSMUs during at least one- third of the years. This would not, however, affect the allocation ... are that: under the fi rst two options a substantial portion (>65%) of the catch limit would be allocated ... monitoring, the fi shery would be restricted in some of its traditional fi shing grounds during years of low ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 81–97 : Author(s): Hewitt, R.P., G. Watters, P.N. Trathan, J.P. Croxall, M.E. Goebel, D. Ramm, K. Reid, W.Z. Trivelpiece and J.L. Watkins
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Precautionary measures for a new fishery on Martialia hyadesi (Cephalopoda, Ommastrephidae) in the Scotia Sea: an ecological approach
established. Data from the CCAMLR Convention Area suggest that M. hyadesi may live for two years, but this may ... that M. hyadesi may live for two years, but this may vary. In common with other ommastrephids, the species ... seasonal environment of the south Atlantic it is unlikely that life cycle falls between one and two years ... is one or two years, the precautionary measures proposed here would remain applicable to a new fishery ... Convention Area suggest that M. hyadesi may live for two years, but this may vary. In coinmon with other ... in Japan in that year (Rodhouse, 1991). In February 1989 two Japanese squid jiggers carried out ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 125–139 : Author(s): Rodhouse, P.G
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Statistical problems in krill stock hydroacoustic assessments
: Two primary issues are at question for hydroacoustic assessments of krill. The first is the methods ... to be not the absolute amount of biomass present in an area, but rather how it is distributed. The issue of patchy years ... Two primary issues are at question for hydroacoustic assessments of krill. The first is the methods ... to be not the absolute amount of biomass present in an area, but rather how it is distributed. The issue of patchy years ... surveys in two consecutive years giving identical biomass for a surveyed area, in one, the biomass ... HYDROACOUSTIC ASSESSMENTS M.C. Macaulay Abstract Two primary issues are at question for hydroacoustic ... in an area, but rather how it is distributed. The issue of patchy years vs more even distribution would ... and variance of the population. Because of the high sampling frequency of a hydroacoustic survey (one sample ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Author(s): Macaulay, M.C.
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Refinements to the strategy for managing depleted fish stocks based on CCAMLR objectives
fish stocks to recover to levels near those giving greatest net annual increment within two to three ... that applying a policy of F 0.1 will not always lead to stock recovery in two to three decades, and hence ... to levels near those giving greatest net annual increment within two to three decades is illustrated ... will not always lead to stock recovery in two to three decades, and hence that additional management policies ... stock en 20 ou 30 ans, et que, par consequent, les stocks surexploites devraient faire l'objet de ... been put into effect the target years for recovery become fixed at 20 and 30 years after the procedure ... by year 20. However, the 95% probability of being above GNAl by year 30 is sensitive to the degree ... ____ ~ o 5 10 15 Year 20 25 30 35 Figure 1: Schematic illustration of the method of calculating subjective ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 467–475 : Author(s): de la Mare, W.K. and A. Constable
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Validation of sink rates of longlines measured using two different methods
Paper Title: Validation of sink rates of longlines measured using two different methods Abstract ... / Description: Sink rates of integrated weight longlines (lines with 50 g.m –1 lead integrated into two strands ... of the ground line – IW-50 lines) were measured during commercial fishing operations using two methods ... , P = 0.859). When the target depth was 15 m, sink rates measured using the bottle method (0.20 ± 0.02 m.s ... –1 to 20 m and were thus 30% slower than those measured to 20 m (Table 1). This difference ... increment sink rates increased by 30%, and by a further 10% over the last two increments. The mean values ... . In this experiment, the sink rates to target depths of 2 and 20 m differed signifi cantly by 30% (Table ... . 11 (2004): 179–187 179 VALIDATION OF SINK RATES OF LONGLINES MEASURED USING TWO DIFFERENT METHODS ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 179–187 : Author(s): Wienecke, B. and G. Robertson
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Age determination of Notothenia gibberifrons from the South Shetland Islands, Antarctic Peninsula subarea (Subarea 48.1)
scale readings gave a result of one year more. This could arise from the difficulty in differentiating ... in 19 Potter Cove specimens. In some cases scale readings gave a result of one year more. This could ... on Notothenia gibberifrons specimens collected at two localities near the South Shetland Islands (Low ... those in the same age group around South Georgia. Likewise, our values are lower than the ones reported ... compared in 19 Potter Cove specimens. In some cases scale readings gave a result of one year more ... indicated one extra year. This finding is discussed below. Table 2 shows the observed age-length ... and scales (scales indicated 1-2 years less). North et al. (1980) mentioned the difficulty in discriminating ... scale readings resulted in one extra year (Table 1). This could arise from the difficulties with false ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 143-160 : Author(s): Barrera-Oro, E.
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Joinville–D’Urville Islands (Subarea 48.1) – a former fishing ground for the spiny icefish (Chaenodraco wilsoni), at the tip of the Antarctic Peninsula – revisited
Expedition ANT XIX/3 by RV Polarstern in February 2002. Five hauls were conducted north of the two islands ... restricted to the two seasons (1978/79 and 1979/80) when Polish and GDR vessels fished in the area. Length ... of the Antarctic Expedition ANT XIX/3 by RV Polarstern in February 2002. Five hauls were conducted north of the two ... was, however, sparse, being restricted to the two seasons (1978/79 and 1979/80) when Polish and GDR vessels ... vessel Parallaks found two concentrations of C. wilsoni at 62°20’–62°30’S 55°30’–56°00 ... et al. 10 After hatching, larvae, postlarvae and juveniles of C. wilsoni spent one or two years ... , pers. comm., 1980). Exploratory fi shing by a GDR trawler was also conducted on one or two days ... in midwater and subsurface waters and moved with the coastal current to the west. Two- to four-year-old fi ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 1–20 : Author(s): Kock, K.-H., L. Pshenichnov, C.D. Jones, K. Shust, K.E. Skora and Zh.A. Frolkina