Résultats de la recherche
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Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects
distribution, random vessel effects and random stratum-by-year effects Abstract / Description: The current ... CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable in a ... addition, random vessel effects are introduced into the GLM, as specified by a generalised linear mixed ... realistic estimates of their precision. Extra efficiency is gained by recovery of inter-vessel information ... DISTRIBUTION, RANDOM VESSEL EFFECTS AND RANDOM STRATUM-BY-YEAR EFFECTS S.G. Candy Australian Antarctic ... eleginoides) for CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable ... values. In addition, random vessel effects are introduced into the GLM, as specifi ed by a generalised ... series and more realistic estimates of their precision. Extra effi ciency is gained by recovery of inter ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 59–80 : Auteur(s): Candy, S.G
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Analysis of variability of krill size and fish by-catch in the Japanese krill fishery based on scientific observer data
Paper Title: Analysis of variability of krill size and fish by-catch in the Japanese krill ... relationship between statistical precision and sample size was estimated by using variance component analysis ... from fishery process as observation error. In both krill length and by-catch fish number, the ... parameters estimated by the Markov chain Monte Carlo (MCMC) method hardly show difference among years ... statistical precision than the data collected by research vessels. This is primarily because the data ... VARIABILITY OF KRILL SIZE AND FISH BY-CATCH IN THE JAPANESE KRILL FISHERY BASED ON SCIENTIFIC OBSERVER DATA ... estimated by using variance component analysis. Observer datasets from the Japanese krill fishery from 1995 ... length and by-catch fish number, the parameters estimated by the Markov chain Monte Carlo (MCMC) method ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 31–47 : Auteur(s): Okuda, T. and M. Kiyota
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By-catch, growth and feeding of Antarctic juvenile fish taken in krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992
Paper Title: By-catch, growth and feeding of Antarctic juvenile fish taken in krill (Euphausia ... an investigation of juvenile Antarctic fish caught during krill fishing by the FV Grigory Kovtun in ... the area around South Georgia from May to July 1992. Two species were predominant in the by-catches ... per day. In May to June, N. larseni juveniles were represented by fingerlings (mean length of 42.4 to ... CCAMLR Science. Vol. 1: 129-142 BY-CATCH, GROWTH AND ... caught during krill fishing by the FV Grigoy Kovtun in the area around South Georgia from May to July ... 1992. Two species were predominant in the by-catches: Charnpsocephalus gunnari and Nototheniops ... juveniles were represented by fingerlings (mean length of 42.4 to 47.4 mm) and yearlings (72.5 to 73.7 mm ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 129–142 : Auteur(s): Pakhomov, E.A. and S.A. Pankratov
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Estimating the impact of depredation by killer whales and sperm whales on longline fishing for toothfish (Dissostichus eleginoides) around South Georgia
Paper Title: Estimating the impact of depredation by killer whales and sperm whales on longline ... caused by killer whales (Orcinus orca) and sperm whales (Physeter macrocephalus) around South Georgia ... toothfish, usually depressing CPUE by about 50%. Sperm whales occur in smaller pod sizes, normally between 1 ... and 4 animals, and have a relatively lower impact on catches, depressing CPUE by up to 20%. Sperm ... Estimating thE impact of dEprEdation by killEr whalEs and spErm whalEs on longlinE fishing for toothfish ... longliners between 2003 and 2009 were analysed to look at the levels of depredation caused by killer whales ... CPUE by about 50%. Sperm whales occur in smaller pod sizes, normally between 1 and 4 animals, and have ... a relatively lower impact on catches, depressing CPUE by up to 20%. Sperm whales have been more ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 163–178 : Auteur(s): Moir Clark, J. and D.J. Agnew
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The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a simulation model
Paper Title: The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a ... deciding the closure date for fisheries monitored by the Secretariat of CCAMLR, have been difficult to ... implement because of the variation in catch rates shown by the fisheries. Non-fluctuating random and ... is received by the Secretariat. The probability of large over-shoots of the TAC is reduced if ... TO CLOSE FISHERIES REGULATED BY CCAMLR: A SIMULATION MODEL DJ. Agnew* Abstract The methods ... , described in CCAMLR Conservation Measures, used for deciding the closure date for fisheries monitored by ... shown by the fisheries. Non-fluctuating random and fluctuating random catch histories are simulated and ... fishery if these rates indicate that the T AC will be taken before the next report is received by the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 81–97 : Auteur(s): Agnew, D.J.
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Size and density of krill layers fished by a Japanese trawler in the waters north of Livingston Island in January 1988
Paper Title: Size and density of krill layers fished by a Japanese trawler in the waters north of ... the northern waters of Livingston Island were determined during the co-operative survey carried out by ... were 3.25 km, 13.3 m and 228.0 g wet weight/m 2, respectively. The krill layers fished by the trawler ... BY A JAPANESE TRAWLER IN THE WATERS NORTH OF L1VINGSTON ISLAND IN JANUARY 1988 Y. Endo and Y ... Island were determined during the co-operative survey carried out by RV Kaiyo Maru and a Japanese ... wet weightlm2, respectively. The krill layers fished by the trawler during the co-operative survey ... on size, shape and density of Antarctic krill aggregations has been obtained by research vessels ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 339–345 : Auteur(s): Endo, Y. and Y. Shimadzu
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By-catch of fish in the krill fishery
Paper Title: By-catch of fish in the krill fishery Abstract / Description: Observations are ... reported of icefish being taken as by-catch during krill fishing operations from a research vessel. The ... results indicate that the by-catch of fish in the commercial krill fishery may be significant in some ... taken as by-catch during krill fishing operations from a research vessel. The results indicate that the ... by-catch of fish in the commercial krill fishery may be significant in some areas of the South ... netting. The fishery operates by aimed tows at krill swarms which have been located using echosounders ... . Recently concern has been expressed that the fishery may be taking a significant by-catch of fish with the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 381–401 : Auteur(s): Everson, I., A. Neyelov and Y.B. Permitin
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Integrating Count Effort by Seasonally Correcting Animal Population Estimates (ICESCAPE): a method for estimating abundance and its uncertainty from count data using Adélie penguins as a case study
Paper Title: Integrating Count Effort by Seasonally Correcting Animal Population Estimates ... function of sampling availability. ICESCAPE (Integrating Count Effort by Seasonally Correcting Animal ... final adjusted estimates. Adjustment for availability bias is achieved by applying an adjustment factor ... -specific estimates to be aggregated to achieve region-scale population estimates. By way of illustration ... IntegratIng Count effort by SeaSonally CorreCtIng anImal PoPulatIon eStImateS (ICeSCaPe): a method for ... function of sampling availability. ICESCAPE (Integrating Count Effort by Seasonally Correcting Animal ... through to the final adjusted estimates. Adjustment for availability bias is achieved by applying an ... -specific estimates to be aggregated to achieve region-scale population estimates. By way of illustration ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 213–227 : Auteur(s): McKinlay, J., C. Southwell and R. Trebilco
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Data on krill (Euphausia superba Dana) consumption by coastal fishes in Division 58.4.2 (Kosmonavtov and Sodruzhestva Seas)
Paper Title: Data on krill (Euphausia superba Dana) consumption by coastal fishes in Division ... tonnes (Lubimova, Shust, 1980 and Shust, 1987). However these extrapolated values of krill consumption by ... the Sodruzhestva and Kosmonavtov Seas over many years by the YugNIRO institute. Data obtained from ... ) CONSUMPTION BY COAST AL FISHES IN DIVISION 58.4.2 (KOSMONA VTOV AND SODRUZHESTV A SEAS) Ye.A. Pakhomov ... , Shust, 1980 and Shust, 1987). However these extrapolated values of kriU consumption by fish and other ... Sodruzhestva and Kosmonavtov Seas over many years by the YugNIRO institute. Data obtained from trawl and ... determine the level of krill consumption by its various predators. Previous assessments (Lubimova, Shust ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 305–319 : Auteur(s): Pakhomov, Y.A., V.A. Bibik and V.V. Gerasimchuk
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Comparison of two methods to assess fish losses due to depredation by killer whales and sperm whales on demersal longlines
Paper Title: Comparison of two methods to assess fish losses due to depredation by killer whales ... tonnes and 739 ± 87 tonnes of Patagonian toothfish respectively were estimated to be depredated by the ... approach, which can only be implemented when a sufficient level of by-catch species occurs, provides ... Science, Vol. 22 (2015): 1–14 1 Comparison of two methods to assess fish losses due to depredation by ... were estimated to be depredated by the two species. When the two species co-occurred around vessels, 1 ... depredated Patagonian toothfish. This approach, which can only be implemented when a sufficient level of by ... , such as estimating the amount of biomass loss caused by predators. While these losses can be directly ...
Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 1–14 : Auteur(s): Gasco, N., P. Tixier, G. Duhamel and C. Guinet