Search results
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Do krill and salps compete? Contrary evidence from the krill fisheries
). This speculates that the consumption of primary production during early spring by salp blooms could deprive ... and duration of salp blooms vary greatly between and within years (SC-CAMLR, 1997). Corroboration ... of green krill occurred in early summer (December/ January) and decreased thereafter. However ... , the duration of the period of high proportion of green krill varied widely among years (Figure 2). Salp ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 205–216 : Author(s): Kawaguchi, S., T. Ichii, M. Naganobu and W.K. de la Mare
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A first attempt at an assessment of the Patagonian toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands EEZ
. The figures for 2000/01 were calculated as 2 fishing vessels x 40 fishing days x 2 fishing trips/year x 1.1 ... and for surveillance are discussed. HISTORY OF THE FISHERY The Fishery In early 1996, the then South African Sea ... for the fi shery (31 August 1997 to 1 April 1998) and from 31 August 1998 onwards to provide for year- round ... access. The granting of year-round access to the fi ve permit holders necessitated a reappraisal ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 11–32 : Author(s): Brandão, A., D.S. Butterworth, B.P. Watkins and D.G.M. Miller
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An index of per capita recruitment
recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year ... that: (i) post-recruit mortality does not vary over age or between years; (ii) 100% of age-l animals spawn; (iii ... to recruits per spawner when mortality is constant over all ages and years, and when all age-l animals spawn ... -l spawners. Introducing year-to-year random variability in both mortality and proportion of age-l spawners ... is the proportion of age-l animals sampled in year y and M is the post-recruit mortality rate. The intent ... or between years; (ii) 100% of age-l animals spawn; (iii) a representative sample of the population ... is constant over all ages and years, and when all age-l animals spawn. These conclusions are insensitive ... with age-specific decline in mortality and reduction in the proportion of age-l spawners. Introducing year ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Author(s): Hewitt, R
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Results of the CCAMLR Antarctic fish otoliths/scales/bones exchange system
in the years 1977 to 1979. Pol. Polar Res. 1(4): 155-162. SLOSARCZYK, W. 1987. Contribution to the early ... were lost during transportation, therefore only 66 otoliths were available for the exchange. Specimens ... determination. Scales located just below the lateral line under the pectoral fin were found to be most ... of not more than one year. The 'birthday' of Antarctic fish is commonly accepted as 1 July. However, one ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 197–226 : Author(s): Kock, K.-H.
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Trawl bag selectivity in the Champsocephalus gunnari fishery
years demonstrates close similarity. A significant increase in modal length (up to 34-35 cm) as well ... with results from previous years demonstrates close similarity. A significant increase in modal length (up ... was 3.10 for a mesh size of 80 mm. Comparison of these results with results from previous years ... from previous years give a modal length of 24 to 26 cm (AtlantNIRO, 1986). Moreover, Polish ... 80 cm. Comparison of these results with those from previous years shows close similarity ... no. 148003 9653 of fish Total weight 41.07 1.68 (tonnes) Country: USSR, Date: 17 to 28 June 1990 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 295–312 : Author(s): Bidenko, V.G. and I.G. Istomin
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Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South Georgia shelf
for commercial concentrations of C. gunnari in years of high abundance of the species (1982/83, 1983/84 and 1986 ... for clarification of survey techniques used in stock assessment. For a number of years scientists of AtlantNIRO have ... from research vessels which had been fishing for commercial concentrations of C. gunnari in years ... . For a number of years scientists of AtlantNIRO have been conducting trawl surveys for C. gunnari during ... from research vessels which had been fishing for commercial concentrations of C. gunnari in years ... used in stock assessment. For a number of years scientists of AtlantNIRO have been conducting trawl ... nations have in recent years carried out stock assessment studies of channichthyids and nototheniids ... vessels which had been fishing for commercial concentrations of C. gunnari in years of high abundance ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 3–14 : Author(s): Frolkina, J.A. and V.I. Shlibanov
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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
, corresponding to the age of one year (O-group), were used for the calculation of abundance indices ... station in a depth of 245-270 m, where the juvenile distribution was determined in the upper, middle ... mackerel icefish rarely occurred in the middle and surface layers during the 24-hour period. The day ... during day-time and rise into the middle and surface layers and scatter at night. SIZE COMPOSITION ... mile protected zone around South Georgia to the 500 m isobath were sampled with a specially designed ...
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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Analysis of changes in biomass of fish stocks in the South Georgia area in 1976/77-1986/87
stock. High biomass density appeared with 2-4 year intervals after recruiting an abundant year-class ... . High biomass density appeared with 2-4 year intervals after recruiting an abundant year-class ... fish and older predominated in the catch. Their share gradually decreased in later years while ... in the biomass density of C. ~ari stock. High biomass aensity appeared with ~year intervals after recruiting ... an abundant year-class to the exploited stock. The biomass of other bottom species is more stable, especially ... subdivisions (56, 57, 60-62 acc. to Everson 1984), exploited regularly by the Polish fishery, in the 11 years ...
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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Statistical power to detect changes in growth rates of Antarctic fur seal pups
changes (between years) in pup growth rates, the loss of power associated with obtaining weight samples ... years) in pup growth rates, the loss of power associated with obtaining weight samples on only three ... Numerical simulations were used to investigate the power of methods for detecting changes (between years ... date, were computed separately for each sex and year. Bartlett's test was used to evaluate ... squared error (MSE) from both years were formed for use in a power analysis. Monte Carlo simulations ... and year in Table 1. There were no significant differences in variances of pup weights among dates ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 399–409 : Author(s): Boveng, P., J.L. Bengtson and M.E. Goebel
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Acoustic data analysis and models of krill spatial distribution
distribution is highly variable in space and time (Marr 1962), and krill often aggregates into dense swarms ... , 85 pp. MARR, J.W. 1962. The natural history and geography of Antarctic krill Euphausia superba ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Author(s): Morin, A., A. Okubo and K. Kawasaki