Search results
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Growth and age/length structure of populations of Notothenia (Lepidonotothen) squamifrons (Nototheniidae) in various areas of the Indian sector of the Southern Ocean
in this paper. It was found that during the first years of life the linear growth rate is 3 to 5 cm per year ... . It decreases by a maximum of 1 cm during the last years of life. Maximum annual weight increments of 100 to 120 ... in this paper. It was found that during the first years of life the linear growth rate is 3 to 5 cm per year ... . It decreases by a maximum of 1 cm during the last years of life. Maximum annual weight increments of 100 to 120 ... varied from 1 to 15 years. In the first years of the fishery (1969 to 1972) primarily older aged fish ... and the Kerguelen Island Shelf, are presented in this paper. It was found that during the first years of life ... the linear growth rate is 3 to 5 cm per year. It decreases by a maximum of 1 cm during the last years ... tonnes in some years. It is probable that this substantial yield has improved conditions for feeding ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 123–139 : Author(s): Zaitsev, A.K.
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The utilization of seabird censuses for krill monitoring
E. R. Marschoff, J.G. Visbeek and L.R. Fontana Instituto Antarctico Argentino Man-induced changes ... conditions in two consecutive years. Moreover, other parameters of value to the ecosystem are still less ... the projections on the directions of eigenvectors. Contour Plotting This method is due to Andrews (1972 ... targets and geographical features for many years. OUr goal should be to translate this fact ... Ocean is explored. No variation source directly linked with krill was identified by means of ... capable of detecting changes in bird abundance and/or species composition, associated with three levels of ... application of discriminant analysis. Further developments of the method are possible only with greater ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 393-425 : Author(s): Marschoff, E.R., J.G. Visbeek and L.R. Fontana
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CPUE indices used in Soviet krill fishery statistics from 1977 to 1992 and their possible utility for evaluation of relative changes in krill biomass
from the early years of commercial krill fi shing operations in the Atlantic sector of the Antarctic ... . Compared to the Atlas, the RIF statistics contain from 2 to 78% of data for various years and 34.2 ... grouped by subarea, period, standard vessel type, selected year, selected month, areas of krill fl eet ... include days spent waiting for fuel or for catch transhipment and time lost due to other operational ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 165–177 : Author(s): Litvinov, F.F., A.Z. Sundakov and V.I. Arkhipov
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Performance and geometry of the FP-120 trawl used during UK fish stock assessment surveys around South Georgia, Subarea 48.3
trawls have been used for over 20 years to make fishery-independent estimates of the stock sizes ... , the mini-transponder was lost on the first trawl on which it was deployed. Additionally, as trawl ... transducer mounted in the middle of the headline during the tow. This measurement can be used to estimate ... the 170 ft Bolt rope trawl used during the previous year's survey on the MV Hill Cove. The new trawl ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 51–69 : Author(s): Pilling, G. and G. Parkes
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Status of krill target strength
, 1972; MacLennan, 1990) has been applied to krill (Euphausia superba) in the Southern Ocean (Miller ... into two categories: caged (solid circle) and in situ (open circle). As discussed in a later section ... high signal-to-noise-ratio conditions, are consistent with the general pattern. Several specific ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 101–126 : Author(s): Foote, K.G., D. Chu and T.K. Stanton
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Phytoplankton distribution in the mixed layer: implication to krill abundance
dissipative effects are strong (Tennekes and Lumley, 1972, p 68), the scale has a direct implication ... in an early stage. No suggestions can be made relating to the distribution of krill. However, we demonstrated ... . Random dispersal in theoretical population. Biometrika 38: 196-218. TENNEKES, Hand J.L. LUMLEY. 1972 ... and dotted lines are KD. Three different N are used. The top of each line is N=O.001. The middle is N=O.OS ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 331–356 : Author(s): Yamazaki, H. and T.R. Osborn
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Is current management of the Antarctic krill fishery in the Atlantic sector of the Southern Ocean precautionary?
in 1991, is 0.62 million tonnes year –1, equivalent to ~1% of the regional biomass estimated in 2000. Each ... subarea has also had its own catch limit, between 0.093 and 0.279 million tonnes year –1, since 2009 ... years. This suggests that fishing at the trigger level would be equivalent to a long-term exploitation ... estimated subarea biomass in up to 20% of years due to high variability in krill biomass indices. The actual ... ’), established in 1991, is 0.62 million tonnes year–1, equivalent to ~1% of the regional biomass estimated ... in 2000. Each subarea has also had its own catch limit, between 0.093 and 0.279 million tonnes year ... of the regional biomass in recent years. This suggests that fishing at the trigger level would be equivalent ... exceed 9.3% of conservatively estimated subarea biomass in up to 20% of years due to high variability ...
Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 31–51 : Author(s): Hill, S.L., A. Atkinson, C. Darby, S. Fielding, B.A. Krafft, O.R. Godø, G. Skaret, P.N. Trathan and J.L. Watkins
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Sources of variance in studies of krill population genetics
research did not identify dis- tinct populations of Antarctic krill (Fevolden, 1988; Fevolden ... and even truly holoplanktonic organisms can dis- play genetic heterogeneity between populations (Ayoama et ... to be quasi- permanent, large-scale concentrations of krill (Lubimova et al., 1985; Mackintosh, 1972, 1973 ... , population, CCAMLR 109 Sources of variance in studies of krill population studies Early allozyme ...
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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Line weights of constant mass (and sink rates) for Spanish system Patagonian toothfish longline vessels
operations the netting bags abrade on the seabed causing rocks to be lost and the weights to become ... causing rocks to be lost and the weights to become progressively lighter, requiring ongoing repair ... to be lost and the weights to become progressively lighter, requiring ongoing repair. This problem can ... of gear lost in benthic habitats. This paper presents the results of an experiment designed to determine ... (55°13.0'S 66°25.4'W) which lies in the eastern junction of the Beagle Channel and the South ... fishing. The Tierra del Fuego is a 53.6 m Japanese-built (1972) tuna vessel con- verted to the Spanish ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 93–106 : Author(s): Robertson, G., C.A. Moreno, E. Gutiérrez, S.G. Candy, E.F. Melvin and J.P. Seco Pon
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Assessment and tag program adaption methods for exploratory fisheries in the CAMLR Convention Area: an example application for Division 58.4.3a
tagging levels that will produce an expected abundance estimate in the following year of a given precision ... . The combination of the assessment and tagging rate adaption methods can then form the basis of an early management ... in the following year of a given precision whilst ensuring the sustainable exploitation of the stock as per ... then form the basis of an early management plan for exploratory fisheries. The accuracy of the catch limit ... of dis- persion – the expression in equation (14) assumes a hypergeometric recapture model (Seber, 1982 ... that will produce an expected abundance estimate in the following year of a given precision whilst ensuring ... of the assessment and tagging rate adaption methods can then form the basis of an early management plan ... looked at that would be expected to achieve a given abundance precision for the following year ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 101–113 : Author(s): Hillary, R.M