Search results
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Some comments on the procedure for testing estimators of krill abundance which utilise survey data
Paper Title: Some comments on the procedure for testing estimators of krill abundance which ... utilise survey data Abstract / Description: Since krill distributional data do show evidence of spatial ... generation of krill distribution patterns, which are compatible with existing information ... on the distributions from surveys. ‘Two-level’ models of krill distribution are considered. These achieve overall ... WG-KRILL-91/21 SOME COMMENTS ON THE PROCEDURE ... FOR TESTING ESTIMATORS OF KRILL ABUNDANCE WHICH UTILISE SURVEY DATA D.S. Butterworth*, D.L. Borchers ... * and D.G.M. Miller** * ** Abstract Since krill distributional data do show evidence of spatial ... generation of krill distribution patterns, which are compatible with existing information ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 191–205 : Author(s): Butterworth, D.S., D.L. Borchers and D.G.M. Miller
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Sources of variance in studies of krill population genetics
Paper Title: Sources of variance in studies of krill population genetics Abstract / Description ... : There has been a long-term interest in the population genetics of Antarctic krill species because ... in identifying distinct stocks of swarming krill species has been driven by the development of genetic ... . This has important implications for the design of future studies of krill population genetics, which must ... , Vol. 9 (2002): 107–116 107 SOURCES OF VARIANCE IN STUDIES OF KRILL POPULATION GENETICS S.N. Jarman ... krill species because of their ecological and economic importance. The possibility ... for their conservation. A recent resurgence of interest in identifying distinct stocks of swarming krill species has ... implications for the design of future studies of krill population genetics, which must be able to accommodate ...
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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Estimation of krill (Euphausia superba) mortality and production rate in the Antarctic Peninsula region
Paper Title: Estimation of krill (Euphausia superba) mortality and production rate ... in the Antarctic Peninsula region Abstract / Description: A net sampling survey for krill was carried out by RV ... reached only a factor of 1:1.6. Krill mortality was calculated by linearized catch curve analysis ... a P/B ratio of 0.88 to 0.94 for different years. The exchange rate of water masses and krill biomass within ... WG-KRILL-91/15 ESTIMATION OF KRILL (EUPHAUSIA SUPERBA ... survey for krill was carried out by RV Meteor along the Antarctic Peninsula from 26 December 1989 to 14 ... interannual variability between available surveys reached only a factor of 1:1.6. Krill mortality ... . The exchange rate of water masses and krill biomass within one summer season was roughly estimated as two ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 159–176 : Author(s): Siegel, V.
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Midwater trawl catchability as an aspect of a quantitative assessment of krill biomass conducted using a trawl census survey
Paper Title: Midwater trawl catchability as an aspect of a quantitative assessment of krill ... catchability and krill distribution patterns. A comparative analysis of trawl catchability for commercial ... by high relative error. A standard method for conducting krill trawl census surveys needs to be developed ... of the total amount of krill entering the trawl should be carried out when selecting trawl construction. File ... WG-KRILL-91/32 MIDWATER TRAWL CATCHABILITY AS AN ASPECT ... OF A QUANTIT ATIVE ASSESSMENT OF KRILL BIOMASS CONDUCTED USING A TRAWL CENSUS SURVEY S.M. Kasatkina ... will improve with better knowledge of trawl catch ability and krill distribution patterns. A comparative ... for conducting krill trawl census surveys needs to be developed. Mathematical modelling fishing trawls as well ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 257–272 : Author(s): Kasatkina, S.M.
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On the intensity of sampling krill trawl catches
Paper Title: On the intensity of sampling krill trawl catches Abstract / Description: This paper ... uses actual krill length-frequency data in an attempt to address the problem of the determination ... of adequate sample size to obtain representative krill length-frequency distributions from commercial catches ... measurements of length from commercial krill; catches should be made, as far as possible, by a single observer ... WG-KRILL-90/27 ON THE INTENSITY OF SAMPLING KRILL TRAWL ... to address the problem of the determination of adequate sample size to obtain representative krill length ... . Attention is drawn to the following: • all measurements of length from commercial krill catches should ... measurements made on commercial krill catches should be IIDlliPed into 2 mm size classes; • biological ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 29–48 : Author(s): Miller, D.G.M.
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Surface water circulation in krill fishing areas near the South Shetland Islands
Paper Title: Surface water circulation in krill fishing areas near the South Shetland Islands ... with a drogue attached at a depth of 30 m to assess flow patterns at the depth range where krill tended ... with the distribution of krill catches taken in the area by Japanese vessels during the period from 1981 to 1994 ... which contribute to the formation of stable krill concentrations in the area. The observed long-distance ... SURFACE WATER CIRCULATION IN KRILL FISHING AREAS NEAR THE SOUTH SHETLAND ISLANDS T. Ichii ... at a depth of 30 m to assess flow patterns at the depth range where krill tended to be most abundant ... of the surface circulation was considered in conjunction with the distribution of krill catches taken ... to the formation of stable krill concentrations in the area. The observed long-distance movements of three buoys ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 125–136 : Author(s): Ichii, T. and M. Naganobu
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Moulting interval and growth of juvenile Antarctic krill fed different concentrations of the diatom Phaenodactylum tricornutum in the laboratory
Paper Title: Moulting interval and growth of juvenile Antarctic krill fed different ... Antarctic krill (Euphausia superba) were fed Phaenodactylum tricornutum, at concentrations ranging from 0.0 ... ) of juvenile krill increased, up to a concentration of 1.0 mgC 1 –1. No further effect of food concentrations ... . From these results, maximum daily growth rate (∆BL /IP) of juvenile krill was calculated to be 0.047 mm ... OF JUVENILE ANTARCTIC KRILL FED DIFFERENT CONCENTRATIONS OF THE DIATOM PHAENODACTYLUM TRICORNUTUM ... IN THE LABORATORY T. Ikeda, P.G. Thomas (Australia) Abstract Juveni,le Antarctic krill (Euphausia superba ... (IP) decreased, but an increment of body length per moult (6BL) of juvenile krill increased, up ... growth rate (6BL/IP) of juvenile krill was calculated to be 0.047 mm day-l, which is too slow ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 223-225 : Author(s): Ikeda, T. and P.G. Thomas
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A simple approach for calculating the potential yield of krill from biomass survey results
Paper Title: A simple approach for calculating the potential yield of krill from biomass survey ... Y = λMB 0 for a krill fishery in which both the fishery and krill growth are seasonal. The criterion used ... for the calculations is that the probability that the krill spawning biomass drops below 20% of its median pre ... A simple approach for calculating the potential yield of krill from biomass survey results ... WG-KRILL-91/24 A SIMPLE APPROACH FOR CALCULATING ... THE POTENTIAL YIELD OF KRILL FROM BIOMASS SURVEY RESULTS D.S. Butterworth* , A.B. Punt* and M. Basson ... fishery in which both the fishery and krill growth are seasonal. The criterion used for the calculations ... is that the probability that the krill spawning biomass drops below 20% of its median pre-exploitation level over a 20 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 207–217 : Author(s): Butterworth, D.S., A.E. Punt and M. Basson
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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 ... of Antarctic krill (Euphausia superba), yet the quality and even the utility of the data may be seriously ... was demonstrated by applying it to the acoustic data at 38, 70 and 120 kHz collected from a Chinese krill fishing ... strength of the krill swarms were retained. The method may provide opportunity to improve the utility ... data collected from Antarctic krill fishing vessels X. Wang Ocean University of China Qingdao ... and relative abundance of Antarctic krill (Euphausia superba), yet the quality and even the utility ... , 70 and 120 kHz collected from a Chinese krill fishing vessel. Results show that the interference ... noise was effectively reduced while structure and echo strength of the krill swarms were retained ...
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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Towards an initial operational management procedure for the krill fishery in Subareas 48.1, 48.2 and 48.3
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 ... . Assessment of resource status is provided by the CPUE ‘Composite Index’ proposed by the Workshop on the Krill ... of krill dynamics in the region is developed for simulation testing purposes. A provisional operational ... MANAGEMENT PROCEDURE FOR THE KRILL FISHERY IN SUB AREAS 48.1, 48.2 AND 48.3 D.S. Butterworth ... * * Abstract An operational management procedure for krill (Euphausia superba) in Subareas 48.1, 48.2 ... is provided by the CPUE "Composite Index" proposed by the Workshop on the Krill CPUE Simulation Study ... of the previous three years' CPUE values fall below a target level of 0.75 CPUEref• An operating model of krill ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 189–219 : Author(s): Butterworth, D.S.