Résultats de la recherche
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Krill distribution in the western Atlantic sector of the Southern Ocean during 1983/84, 1984/85 and 1987/88 based on the results of Soviet mesoscale surveys conducted using an Isaacs-Kidd midwater trawl
/84, 1984/85 and 1987/88 based on the results of Soviet mesoscale surveys conducted using an Isaacs ... according to the standard method for Isaacs-Kidd midwater trawls operating in the layer 0 to 100 m. Overall ... , 48.2 and 48.3) and for the whole study area. Survey results confirm current understanding of the ... characterised by a change in biomass of more than two orders of magnitude in different seasons, was observed in ... Evrika (20 January-9 March 1988) Figure 1: Station grid for krill sampling surveys. Krill ... " 50" 45" 40" 35" 30" Figure 4: Krill diskibution (g/ l 000 m3) in strata 0 to 100 m, 20 January to ... currents (relative to the 1 000 dbar), 20 January to 9 March 1988. 60" 55" 50" 45" 40" 35" 30" Figure 7 ... whether it was normal for a certain time of the year. The absence of krill aggregations from the South ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 59–70 : Auteur(s): Sushin, V.A. and K.E. Shulgovsky
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Interactions of Patagonian toothfish fisheries with killer and sperm whales in the Crozet Islands Exclusive Economic Zone: an assessment of depredation levels and insights on possible mitigation strategies
Crozet Islands Exclusive Economic Zone: an assessment of depredation levels and insights on possible ... , killer whales alone, and the two species co-occurring were observed on 32.6%, 18.6% and 23.4 ... whales were found to be responsible for the largest part of this loss (>75%), while sperm whales had a ... killer whales were detected between vessels suggesting the influence of operational factors on ... (49%) depredation had occurred in that year. These two factors could account for the lower estimated ... depredation rate for that year, Tixier et al. 190 which could be an artefact related to the method used ... fishing depth (500–2 000 m) which is not the case for sperm whales. For these two rea- sons, the focus ... included as a fixed effect and tested for its effect alone or in interaction with the other two variables ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 179–195 : Auteur(s): Tixier, P., N. Gasco, G. Duhamel, M. Viviant, M. Authier and C. Guinet
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The influence of bait quality on the sink rate of bait used in the Japanese longline tuna fishing industry: an experimental approach
tuna fishing industry: an experimental approach Abstract / Description: Experiments were conducted to ... . The addition of a 20 g lead sinker to a conventional 20 g tuna hook reduced the sink time of bait ... Paper Title: The influence of bait quality on the sink rate of bait used in the Japanese longline ... determine the effects of bait size (large versus small) and bait condition (frozen versus thawed) on the ... the effect of added weight (sinkers) on the sink rates of bait. Lead sinkers weighing 10 g, 20 g, 30 ... experiment. Baits were grouped into two size classes and chosen at random from these classes. For each ... measured. IRESULTS Table 1 shows the results of an analysis of variance testing for differences in ... baits tested in each treatment, all Table 1: Summary of an analysis of variance testing for the effect ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 123–129 : Auteur(s): Brothers, N., A. Foster and G. Robertson
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An assessment of the impact of krill fishery on penguins in the South Shetlands
Paper Title: An assessment of the impact of krill fishery on penguins in the South Shetlands ... an adverse impact on the local krill biomass, and hence on penguins, when catch levels are also taken ... Abstract / Description: An assessment of the competition between the Japanese krill (Euphausia superba ... krill catch is very low in December while the catch rate for the following three months is roughly ... 20 or 30 X 30 n miles from recent surveys (1989/90 and 1990/91). The krill biomass for each of ... , krill catches were calculated for each square of 10 minutes latitude by 20 minutes longitude (=l0 X 10 ... respective colonies for chinstraps, 80 km for Adklies and 20 km for gentoos (Everson, 1987; Trivelpiece et ... TEMPORAL PATTERNS FOR KRILL BIOMASS Estimates of krill biomass are available for grid squares of 20 X ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 107–128 : Auteur(s): Ichii, T., M. Naganobu and T. Ogishima
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Timing of clutch initiation in Pygoscelis penguins on the Antarctic Peninsula: towards an improved understanding of off-peak census correction factors
: towards an improved understanding of off-peak census correction factors Abstract / Description: Penguin ... . In this paper the authors present an analysis relating to both these challenges. Clutch initiation ... dates for four penguin breeding sites are examined (Cape Shirreff, Admiralty Bay, Humble Island and ... (Pygoscelis adeliae), gentoo (P. papua) and chinstrap (P. antarctica)). A statistical model for determining ... on which CIDs were recorded for each of the species at each site in each year. The y-axis ... correcting off-peak censuses, this model is applied to two census counts for which exact data on CID is ... two components. One is a model to estimate the date of peak egg laying for a given site in a given ... year, and the second is an estimate of the rate of nest attrition following the peak of egg laying ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 149–165 : Auteur(s): Lynch, H.J., W.F. Fagan, R. Naveen, S.G. Trivelpiece and W.Z. Trivelpiece
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A declining trend in the abundance of Notothenia rossii marmorata and Notothenia gibberifrons observed in fjords in two sites in the South Shetland Islands
gibberifrons observed in fjords in two sites in the South Shetland Islands Abstract / Description: A declining ... two sites in the South Shetland Islands (Subarea 48.1), is analyzed by a nested ANOVA and demonstrated ... as significant. The material for the current study was obtained with trammel nets at Potter Cove ... to the catches of N. neglecta. A similar declining trend had been reported in the 1960s and 1970s for ... , expressed as proportions (Equation 1). An overall declining trend is evident for both species, and its ... de Mayo I. and Moon Bay (Climara Station), Livingston I. This paper presents an analysis on the ... similar depths in sites close to Potter Cove and Moon Bay contain data on accumulated catches for non ... NOTOTHENIA ROSSII MARMORATA AND NOTOTHENIA GIBBERIFRONS OBSERVED IN FJORDS IN TWO SITES IN THE SOUTH ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 263–274 : Auteur(s): Barrera-Oro, E. and E. Marschoff
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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 ... , for measuring sink rates to shallow depths when instant readings were required. TDRs can be used to ... temperature where they soaked for at least 30 minutes before being deployed. Since the TDRs may hang on the ... deployment of an instrument about 30 s before it passed through the setting chute. The observer positioned ... depths, average sink rates of the TDRs were obtained for four target depths: 2, 5, 10 and 20 m. It was ... 0.239 ± 0.016 m.s–1 to 20 m and were thus 30% slower than those measured to 20 m (Table 1). This ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 179–187 : Auteur(s): Wienecke, B. and G. Robertson
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Fishing ground selection in the Antarctic krill fishery: trends in patterns across years, seasons and nations
of high krill density observed by scientific surveys, and possible reasons for this mismatch are ... further discussed. A revised format for data submission is suggested in order to accommodate possible ... years, seasons and nations Abstract / Description: Patterns of fishing ground selection were ... remained relatively constant in Subareas 48.2 (March–May) and 48.3 (June–August). In 25 years of krill ... Science, 3: 13–30. Hewitt, R.P., D.A. Demer and J.H. Emery. 2003. An eight-year cycle in krill biomass ... seasons and calendar years: CCAMLR fishing seasons start on 1 December and end on 30 November. For ... period. All data points were assigned to SSMUs (Figure 1). For the 10 n mile x 10 n mile or 30 n mile x ... , beginning operations late in the 1999/2000 fish- ing season. For the first two seasons, it only oper- ated ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 117–141 : Auteur(s): Kawaguchi, S., S. Nicol, K. Taki and M. Naganobu
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Towards an initial operational management procedure for the krill fishery in Subareas 48.1, 48.2 and 48.3
for the simulation testing of procedures, and an operational definition of CCAMLR Article II to ... on the Krill CPUE Simulation Study. Annual TACs are restricted to an initial ceiling (C c) for a five ... Paper Title: Towards an initial operational management procedure for the krill fishery in ... Subareas 48.1, 48.2 and 48.3 Abstract / Description: An operational management procedure for krill ... an impact on the assessment data generated by the model for the next year of the simulation. In this ... . Annual TACs are restricted to an initial ceiling (Cc) for a five year period, with a reference CPUE ... of 20-year projections of the krill operating model to the size assumed for the krill resource. A ... stochastic component. To offset these problems, the catch control law for the T AC in year y is based on the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 189–219 : Auteur(s): Butterworth, D.S.
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An assessment of CCAMLR measures employed to mitigate seabird mortality in longlining operations for Dissostichus eleginoides around South Georgia
-chinned petrels, two black-browed albatrosses and one unidentifiable bird caught on hooks. One giant ... for 18 birds caught; giant petrels concentrated on taking discarded offal, and accounted for five ... Paper Title: An assessment of CCAMLR measures employed to mitigate seabird mortality in ... longlining operations for Dissostichus eleginoides around South Georgia Abstract / Description: Longlining ... lasting 20 minutes each over an observation period of 1.5 to 2 hours. Observations were made from the ... for each day's hauling. Periods were selected in one of two ways: haphazardly over the line when no ... . For sampling units, the mother line was divided into lengths of 30 coils using sequences of three ... marked connecting lines. At the start of hauling, four 30-coil lengths were randomly selected for ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 217–230 : Auteur(s): Ashford, J.R. and J.P. Croxall