Search results
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Research currently being undertaken by the Republic of South Africa on "dependent and related species" within the Antarctic marine ecosystem
t:OfflPreh_ensive collectio11,e; of suitable ref1Uel'1t1P. rrr.!!te:r-la!, ,-artic:u!ar-1::,1 the let-5!. di ... Paper Title: Research currently being undertaken by the Republic of South Africa on " ... components of the biological sciences programme are described. The primary objective of the studies being ... undertaken is to improve our understanding of the ecology of important predators (especially seals and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 59-77 : Author(s): South Africa
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An assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank (CCAMLR Division 58.4.3b) based on fine-scale catch and effort data
data were derived and plotted against total catch for each longline fishing event. The dis- tribution ... - lation framework are worthy avenues for further investigation. However, none of the scenarios dis ... Paper Title: An assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank ... CCAMLR Scientific Committee expressed concern as to the status of the stock on which the exploratory ... Dissostichus spp. fishery on BANZARE Bank (CCAMLR Division 58.4.3b) was based. This paper presents a summary of ... fine-scale catch and effort data held by CCAMLR for BANZARE Bank, as well as descriptive analyses of ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 55–78 : Author(s): McKinlay, J.P., D.C. Welsford, A.J. Constable and G.B. Nowara
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?
/O or cr2/0z sample size cr/O or cr2/0z sample size v in units of % success of a, in b,in standard dis ... index of a morphometric characteristic? Abstract / Description: In sexually dimorphic species ... discriminant analysis can be used to determine the sex of individuals, it is only able to correctly sex a ... certain proportion of birds. Two overlapping normal distributions are used to show that there is a ... using discriminant analysis. When discriminant functions are able to correctly determine the sex of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Author(s): Agnew, D.J.
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Acoustic estimates of krill biomass in the Elephant Island area: 1981–1993
adjusted to correct for the losses, an impedance mismatch between the transceiver and the transmission ... Paper Title: Acoustic estimates of krill biomass in the Elephant Island area: 1981–1993 Abstract ... / Description: Acoustic estimates of krill biomass in the vicinity of Elephant Island are presented for the ... years 1981 to 1993 (with the exception of 1982 and 1986). Estimates for 1981 to 1991 are based on ... previous reports adjusted for the recently proposed definition of krill target strength (Greene et al ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 1–5 : Author(s): Hewitt, R.P. and D.A. Demer
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Results of fish stock assessment survey, South Georgia region, November - December 1986
° W 36° W 35° W Fi gure 7. Di stri buti on of ca tch per tow, ~lototheni a squamifrons, South Georg ... . The estimated biomass.of Dissostichus eleginoides is about 70% lower than in 1984/85 (Kock 1985b). Length ... Paper Title: Results of fish stock assessment survey, South Georgia region, November- December ... 1986 Abstract / Description: Biomasses and length compositions of eight stocks from South Georgia are ... described based on results of a stratified random bottom trawl survey. A total of 124 tows were undertaken ... . Biomass was estimated based on stratified swept-area calculations. Estimates of biomass of Notothenia ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 143-183 : Author(s): Gabriel, W.L.
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Calibration of an acoustic echo-integration system in a deep tank, with system gain comparisons over standard sphere material, water temperature and time
and salinity should be measured to correct for absorption losses. The standard target must be held stable ... of temperature, standard sphere and time, is 2.1 dB, i.e., 0.8 dB less than the total range ofTS gain ... Paper Title: Calibration of an acoustic echo-integration system in a deep tank, with system gain ... sphere. It presents the results of an extensive calibration of a Simrad EK500 scientific echosounder with ... gain, including the effects of temperature, standard sphere and time, is 2.9 dB. Gain values calibrated ... with the Cu sphere are, with the exception of the long pulse length, lower than those from the WC ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 127–144 : Author(s): Demer, D.A. and R.P. Hewitt
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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
% of the krill were dam- aged and losses of the raw krill material could be 20% or more (Anon., 2001). Another ... possible utility for evaluation of relative changes in krill biomass Abstract / Description: Key catch-per ... -unit-effort (CPUE) indices used in Soviet krill fishery statistics, as well as the main sources of data ... -days fished (CVDF), catch per extended vessel-days fished (CEVDF) and catch per hour of trawling (CHT ... ). A relatively high correlation between mean monthly values of CVDF and CEVDF, and CVDF and CHT was ...
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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An integrated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) for the Heard and McDonald Islands using CASAL
, estimation of tag- loss rates for dart tags, and improved estimates of the number of fish scanned for tags ... Division 58.5.2), using CASAL and data consisting of multi-year random stratified trawl survey (RSTS ... representative of the main plateau, where juvenile fish are found, but are of relatively low intensity in effort ... , consisting of three main grounds. The model implemented in CASAL is a simple, single-sex, single-area ... functions for each ground by gear (trawl and longline) combination. Various combinations of dataset ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 1–34 : Author(s): Candy, S.G and A.J. Constable
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An index of per capita recruitment
Paper Title: An index of per capita recruitment Abstract / Description: An index of per capita ... recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... is the post-recruit mortality rate. The intent of the index is to facilitate investigation of ... reproductive success and the factors postulated to affect it. The formulation of PCR is based on the ... AN INDEX OF PER CAPITA RECRUITMENT R. Hewitt Southwest Fisheries Science Center PO Box 271, La ... Jolla, Ca. 92038, USA Abstract An index of per capita recruitment (PCR) is proposed such that ... where R1 is the proportion of age-l animals sampled in year y and M is the post-recruit mortality rate ... . The intent of the index is to facilitate investigation of reproductive success and the factors ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Author(s): Hewitt, R
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Assessments of by-catch in trawl fisheries at Heard and McDonald Islands
Paper Title: Assessments of by-catch in trawl fisheries at Heard and McDonald Islands Abstract ... (Statistical Division 58.5.2) to significantly affect, in the long term, spawning biomass of three taxa caught ... skates). The long-term annual yield for each of the three taxa was estimated using the generalised yield ... biomass estimates from surveys in the region from 1990 to 1993 and a limited amount of biological data ... ASSESSMENTS OF BY-CATCH IN TRAWL FISHERIES AT HEARD AND MCDONALD ISLANDS A.J. Constable, R. Williams and ... (Statistical Division 58.5.2) to significantly affect, in the long term, spawning biomass of three taxa caught ... skates). The long-term annual yield for each of the three taxa was estimated using the generalised yield ... biomass estimates from surveys in the region from 1990 to 1993 and a limited amount of biological data ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 231–243 : Author(s): Constable, A.J., R. Williams and W.K. de la Mare