Search results
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Fishing intensity of the Soviet fleet in krill fisheries in the southern Atlantic (Subareas 48.2 and 48.3)
probability statistical theory of fishery systems developed at AtlantNIRO. The impact of the commercial fleet ... Paper Title: Fishing intensity of the Soviet fleet in krill fisheries in the southern Atlantic ... (Subareas 48.2 and 48.3) Abstract / Description: This paper provides an assessment of the impact of the ... % of the total catch. The calculations were based on haul-by-haul data from the Soviet fleet, using a ... Soviet fl eet, using a probability statistical theory of fi shery systems developed at AtlantNIRO. The ... . Haul-by-haul data from the commercial fl eet (i.e. coordinates at trawl start, time of trawl start ... fi shery at the start of a period was derived from the estimated fi shing intensity (Appendix 1 ... on the shelf and at the shelf break to the north of South Georgia. As the season progresses it ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 15–35 : Author(s): Kasatkina, S.M. and V.F. Ivanova
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Analysis of krill trawling positions north of the South Shetland Islands (Antarctic Peninsula area), 1980/81–1999/2000
at the beginning of fishing operations each season. In summer, biological factors that affect product ... Paper Title: Analysis of krill trawling positions north of the South Shetland Islands (Antarctic ... Peninsula area), 1980/81–1999/2000 Abstract / Description: Inter- and intra-annual variability of ... commercial krill trawling positions for the 1980/81 to 1999/2000 seasons in the area north of the South ... mature krill, especially at the beginning of fishing operations each season. In summer, biological ... operate at the edge of the distribution, since krill density must be at least high enough to justify ... by the distribution of larger mature krill, especially at the beginning of each fishing season ... CCAMLR Scie~~ce, Vol. 8 (2001): 25-36 ANALYSIS OF ...
Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 25–36 : Author(s): Kawaguchi, S. and K. Segawa
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Australian research on Antarctic bird and seal diets
data on the diets of important vertebrate predator species in Prydz Bay and around the sub-Antarctic ... rather low proportion of the diet of most vertebrate predators. Euphausia crystallorophias and the fish ... use of these predators to monitor the state of prey populations is thus very limited, although ... continuing studies will be useful to assess the natural variability of the system. Around the sub-Antarctic ... Island and Macaroni, E. chrysolophus at Heard Island). A few data are available also on the diets of ... °30'S: 158°57'E), Lusitania Bay. Time: November 1984 to November 1985 Source of material: At least ... contents of 17 birds shot at sea Reference: Montague (1984) Mean weight of all food: 31g, range 2-72g ... . Prey size: Average carapace length of Chorismus was steady through year at 13.3±1.4 mm, but longer ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 231-249 : Author(s): Williams, R.
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Geographical differences in the condition, reproductive development, sex ratio and length distribution of Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica (CCAMLR Subarea 88.1)
length distribution of Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica (CCAMLR ... Subarea 88.1) Abstract / Description: A number of morphological and reproductive measurements made ... to 2004/05 fishing seasons on board the autoliner San Aotea II have been analysed. Results of this ... study indicate measurable differences in a number of indices from toothfish found on the Ross shelf ... . mawsoni suggesting that 50% of Fenaughty 30 the population of both sexes is mature at 100 cm TL ... the southern samples remains consistently at a lower level than that of the northern ones until at ... between at least these two broadly defined areas. The predominance of sexually mature fish in the north ... vitellogenesis means that sexually mature female fish will have ovaries with yolked oocytes at all times of the ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 27–45 : Author(s): Fenaughty, J.M
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Analysis of changes in biomass of fish stocks in the South Georgia area in 1976/77-1986/87
. Season L~onth Vessel Place of caoture Depth Swept Ho.of Gear Horizontal Soeed of /Division No.af- range ... Paper Title: Analysis of changes in biomass of fish stocks in the South Georgia area in 1976/77 ... the stocks of five fish species (Champsocephalus gunnari, Chaenocephalus aceratus, Pseudochaenichthys ... 1976/77-1986/87. In most of the seasons analysed, the estimates covered a near-bottom layer in about 1 ... /6 of the area of the island shelf. Assessment results point to considerable variations in fish ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 185-211 : Author(s): Mucha, M. and W. Ślósarczyk
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A post-processing method to remove interference noise from acoustic data collected from Antarctic krill fishing vessels
from Antarctic krill fishing vessels Abstract / Description: The use of fishing-vessel-based acoustic ... data has been recognised as an important way to estimate the distribution and relative abundance of ... Antarctic krill (Euphausia superba), yet the quality and even the utility of the data may be seriously ... degraded by interference noise due to the lack of synchronisation of the acoustic instruments found on some ... at corresponding positions in the thresholded data. Application of the method To evaluate the ... krill swarm echoes. The interfer- ences were most pronounced at 38 kHz because of other acoustic ... . Traykovski. 1998. Effects of orientation on acoustic scattering from Antarctic krill at 120 kHz. Deep-Sea ... data collected from Antarctic krill fishing vessels X. Wang Ocean University of China Qingdao ...
Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 17–30 : Author(s): Wang, X., J. Zhang and X. Zhao
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Estimates of fish stock biomass around South Georgia in January/February 1985
. gibberifrons and Ps. georgianus were at a level of about 25 – 40% of that of the pristine state. The stocks ... Paper Title: Estimates of fish stock biomass around South Georgia in January/February 1985 ... estimate stock sizes of the commercially exploited Notothenia rossii, N. guntheri, N. gibberifrons ... around South Georgia. Due to the small data base and the scarcity of comparative information the state of ... and Ps. georgianus were at a level of about 25 - 40% of that of the pristine state. The stocks most ... , 1985a) but nevertheless has been shown to provide acceptable results at least for some of the ... slightly increased. Stock size of 15 762 t ( t able 1) is obviouly still at a low level and was only ... - straints, however, stock size is assumed to be very low in comparison to tha t of 141 000 t at the onset ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 1-32 : Author(s): Kock, K.-H.
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Evaluating the impact of multi-year research catch limits on overfished toothfish populations
assessed in this study indicate that, where a stock has been depleted to at or below 20% of the median ... Paper Title: Evaluating the impact of multi-year research catch limits on overfished toothfish ... populations Abstract / Description: In stocks that have been depleted by overfishing, the benefit of ... may contribute to delaying or preventing the recovery of such stocks. Through simulating a Patagonian ... research program, while at the same time minimising the risk that these catches hinder the recovery of a ... been depleted to at or below 20% of the median unfished spawning stock biomass, research catches in ... . The unfished median biomass (B0) was set at 5 000 tonnes, to be within the range of total aggregate ... selected at random from a lognormal distribution with a CV of 0.6 and mean recruitment set to achieve a ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 47–55 : Author(s): Welsford, D.C
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Commercial krill fisheries in the Antarctic, 1973 to 1988
: STATLANT data reported to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR ... ) fishery between 1972/73 and 1987/88. The annual krill catch rose gradually to a peak of some 500 000 ... tonnes in 1981/82 before dropping to allow level in 1983/84 and stabilizing at about 400 000 tonnes ... thereafter. In terms of both catch and effort the Soviet and Japanese krill fisheries in Subareas 48.1, 48.2 ... in 1983/84 and stabilizing at about 400 000 tonnes thereafter. In terms of both catch and effort ... current efforts aimed at assessing the role of the minke whale (Balaenoptera acutorostrata) as an ... cessation of fishing in April/May. In Subarea 48.2, on the other hand, fishing commences at a similar time ... realistically applied in the absence of minke whale stomach contents data at a similar level of resolution as ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 229–281 : Author(s): Miller, D.G.M.
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Otolith microstructure of juvenile mackerel icefish (Champsocephalus gunnari) (Channichthyidae) in the South Georgia area
) to 2.8 μm at 500 days (TL 13.1 cm). The pelagic stage of egg incubation development for fish of the ... Paper Title: Otolith microstructure of juvenile mackerel icefish (Champsocephalus gunnari ... ) (Channichthyidae) in the South Georgia area Abstract / Description: The otolith microstructure of juvenile ... a trawl survey of juveniles in February–March 2002 on the South Georgia shelf. Juvenile fish ... observed from November to July. The highest number of females at stage V was found in April–May. Spawning ... at depths of 140–244 m. Catches of C. gunnari increased in pelagic trawl samples in the 15–95 m ... - ment zones were selected at the beginning, mid- dle and end of the period, then their width was ... increments per zone and the mean otolith width at the end of the 100-day period estimated. Daily ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 173–181 : Author(s): Shcherbich, L.V