Search results
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Patterns and processes in the distribution and dynamics of Antarctic krill
distribution and dynamics of Antarctic krill population at various spatial and temporal scales. We suggest that ... distribution patterns at various scales of observation to ascertain the plausibility of the model and identify ... Paper Title: Patterns and processes in the distribution and dynamics of Antarctic krill Abstract ... / Description: A general framework is presented to develop, test and integrate component models of the ... Antarctic krill population at various spatial and temporal scales. We suggest that models of increasing ... should then be compared to statistical descriptions of the observed distribution patterns at various ... physical models of turbulent redistribution are not sufficient to explain krill distribution at small ... physical factors as providing an adequate explanation of the fluorescence spectrum at least on ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 281–299 : Author(s): Levin, S.A., A. Morin and T.M. Powell
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Seabird interactions with longlining operations for Dissostichus eleginoides around South Georgia, April to May 1994
during hauls. The 16 sets made at night contributed 15% of overall mortality, all of white-chinned ... disproportionately affected in relation to the size of their breeding population at South Georgia when compared to ... -seven line sets were observed and 98 deaths of seabirds were recorded over 20 sets; no deaths occurred ... petrels (Procellaria aequinoctialis); the four day sets contributed 85% of deaths, with giant petrels ... deaths of seabirds were recorded over 20 sets; no deaths occurred during hauls. The 16 sets made at ... affected in relation to the size of their breeding population at South Georgia when compared to ... of day, and was affected by behavioural interactions between birds. Setting only at night would ... in each period. Reports on the effectiveness of measures aimed at mitigating incidental mortality ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 111–121 : Author(s): Ashford, J.R., J.P. Croxall, P.S. Rubilar and C.A. Moreno
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Effects of recruitment variability and natural mortality on generalised yield model projections and the CCAMLR decision rules for Antarctic krill
of recruits, with fewer years having intermedi- ate proportions of recruits. Of course it is always possible ... decision criteria for at least two of the four recruitment vectors based on net sampling, regardless of how ... Paper Title: Effects of recruitment variability and natural mortality on generalised yield model ... natural mortality rate of 0.8 and recruitment variability generated using a Beta distribution for ... proportional recruitment of krill. In this study, krill sampling data for empirical size frequencies were ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 81–96 : Author(s): Kinzey, D., G. Watters and C.S. Reiss
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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 ... concentrations of the diatom Phaenodactylum tricornutum in the laboratory Abstract / Description: Juvenile ... Antarctic krill (Euphausia superba) were fed Phaenodactylum tricornutum, at concentrations ranging from 0.0 ... –5.0 mgC 1 –1. Intermoult period (IP) decreased, but an increment of body length per moult (∆BL) of ... OF JUVENILE ANTARCTIC KRILL FED DIFFERENT CONCENTRATIONS OF THE DIATOM PHAENODACTYLUM TRICORNUTUM IN ... superba) were fed Phaeodactylum tricornutum, at concentrations ranging from 0.0-5.0 mgC 1 1. Intermoult ... period (IP) decreased, but an increment of body length per moult (6BL) of juvenile krill increased, up ... to a concentration of 1.0 mgC 1-1 • No further effect of food concentrations on IP or 6BL was seen ...
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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Optimization of survey sampling design in the detection of interannual variability and prey size selectivity in the diet of penguins
OF KRILL EATEN BY PENGUINS At the 1989 Meeting ofWG-CEMP, the desirable minimum size of changes ... the optimal allocation of observations at each level in nested ANOVA designs. The optimal numbers of ... errors fixed at 0.1. Cost values of manpower required are based on Argentinian logistics. File: 34 ... Paper Title: Optimization of survey sampling design in the detection of interannual variability ... and prey size selectivity in the diet of penguins Abstract / Description: Based on the preliminary ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 551–559 : Author(s): Marschoff, E. and B. Gonzalez
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Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea
–138. Chang, W.Y.B. 1982. A statistical method for evalu- ating the reproducibility of age ... Paper Title: Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from ... the Ross Sea Abstract / Description: Juveniles of the macrourid Macrourus whitsoni were collected by ... the NIWA research vessel Tangaroa during the BioRoss survey of the western Ross Sea and Balleny ... Islands in 2004. Intensive analysis of otoliths from these specimens greatly increased confidence in the ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 291–303 : Author(s): Marriott, P.M., M.J. Manning and P.L. Horn
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Is the attempt to estimate the biomass of Antarctic fish from a multi-species survey appropriate for all targeted species? Notothenia rossii in the Atlantic Ocean sector – revisited
already heavily fished at the beginning of the 1970s. The closure of the fishery for this species in 1985 ... are more or less evenly distributed over the area at the time of the survey. This assumption is ... Paper Title: Is the attempt to estimate the biomass of Antarctic fish from a multi-species survey ... was one of the first conservation measures adopted by CCAMLR. Fish biomass within a CCAMLR subarea or ... species in Southern Ocean fi sheries. The species was already heavily fi shed at the beginning of the ... surveys that target a number of species, including N. rossii, at the same time. These surveys are ... area at the time of the survey. This assumption is violated in the case of N. rossii, which is non ... -species surveys has indicated a substantial recovery of N. rossii, either at South Georgia or off ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 141–153 : Author(s): Kock, K.-H., M. Belchier and C.D. Jones
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Is current management of the Antarctic krill fishery in the Atlantic sector of the Southern Ocean precautionary?
excessive concentration of catch at the subarea scale. Finer-scale management might be necessary to manage ... Paper Title: Is current management of the Antarctic krill fishery in the Atlantic sector of the ... Southern Ocean precautionary? Abstract / Description: This paper explains the management of the Antarctic ... krill (Euphausia superba) fishery in the Atlantic sector of the Southern Ocean, and current knowledge ... of the regional biomass in recent years. This suggests that fishing at the trigger level would be ... limits help prevent excessive concentration of catch at the subarea scale. Finer-scale manage- ment ... probability of the spawning stock biomass falling to 20% of the reference level at any time should be no ... in deeper waters and have been recorded at the seabed to depths of 3 500 m (Clarke and Tyler, 2008 ...
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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Species identification and age estimation for the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea
- rid otoliths, for subsequent ageing, on two com- mercial longline trips to the Ross Sea (CCAMLR ... by the observers. In 2002, CCAMLR observers were requested to collect macrourid specimens for identifi cation ... exhibited a degree of sexual dimorphism. The age at which 50% of fish are sexually mature was estimated to ... whitsoni) from the Ross Sea Abstract / Description: Samples of macrourid rattail by-catch from the ... Zealand for subsequent confirmation of their identity by researchers from the National Institute of Water ... the geographic source of the aged sample. Counts of translucent zones were made from baked and cross ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 37–51 : Author(s): Marriott, P., P.L. Horn and P. McMillan
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Evidence to support the annual formation of growth zones in otoliths of Antarctic toothfish (Dissostichus mawsoni)
- ately apparent fl uorescent zones in the ultraviolet light photographs. For three of the remaining ... translucent zone is formed annually in otoliths of juvenile D. mawsoni. Mean fish lengths at ages 0.5, 1.5 ... Paper Title: Evidence to support the annual formation of growth zones in otoliths of Antarctic ... annually in the otoliths of this species. However, no evidence to validate this assumption has previously ... estimates agree with growth curves calculated previously from a sample of data that was large but lacked any ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 125–138 : Author(s): Horn, P.L., C.P. Sutton and A.L. DeVries