Résultats de la recherche
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An alternative method for estimating the level of illegal fishing using simulated scaling methods on detected effort
Paper Title: An alternative method for estimating the level of illegal fishing using simulated ... effort is put forward. The results from this new method are similar to those of the Agnew and Kirkwood ... (2005) method, and this suggests that the current method is adequate under circumstances of low evasion ... performs better in the case of zero detections and can potentially better handle the evasion of detection ... illegal fi shers will tend to curtail their fi shing, but if they are near the end of their trip they may ... the more complete calculation of illegal fi shing trip length to replace equation 4 could be ... should be noted that without loss of general- ity it would be possible to include a search area in this ... ): 143–161 143 AN ALTERNATIVE METHOD FOR ESTIMATING THE LEVEL OF ILLEGAL FISHING USING SIMULATED ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 143–161 : Auteur(s): Ball, I
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Biogeographic patterns of benthic invertebrate megafauna on shelf areas within the Southern Ocean Atlantic sector
Paper Title: Biogeographic patterns of benthic invertebrate megafauna on shelf areas within the ... Southern Ocean Atlantic sector Abstract / Description: Bioregionalisation of Antarctic and Southern Ocean ... shelf communities ideally incorporates a range of data on physical, environmental and biological ... properties. Analysis of the benthic invertebrate megafaunal assemblages of shelf habitats within the Atlantic ... shelves east of the main chain including Elephant Island and those north of the Antarctic Peninsula ... George Island, west and northwest of Elephant Island and north- east of Joinville Island. Lockhart ... islands themselves the trend is west to east, whereby a region of low biomass on the western shelf ... shelf of South Georgia are dominated by Echinodermata but biomass dominance is replaced further east ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 167–192 : Auteur(s): Lockhart, S.J. and C.D. Jones
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Distribution and size–age composition of Antarctic krill (Euphausia superba) in the South Orkney Islands region (CCAMLR Subarea 48.2).
Paper Title: Distribution and size–age composition of Antarctic krill (Euphausia superba) in the ... composition and biological condition of Antarctic krill (Euphausia superba) caught by the Russian krill ... distribution of size–age groups in association with particular water masses indicated that age 2+ krill ... dominated in cold Weddell Sea waters in the southern parts of the fishing area, while older age classes (3 ... estimating the size–age structure of pop- ulations based on length-frequency distributions (Marr, 1962 ... life-span of E. superba range from 3 to 8 years (Marr, 1962; Makarov, 1983; Aseev, 1984; Ikeda, 1984 ... of Euphausia superba Dana. Antarctic, 22: 107–120 (in Russian). Marr, J.W.S. 1962. The natural ... Understanding the population structure of Antarctic krill (Euphausia superba) is one of the major issues for ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 123–134 : Auteur(s): Sologub, D.O. and A.V. Remeslo
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Effects of recruitment variability and natural mortality on generalised yield model projections and the CCAMLR decision rules for Antarctic krill
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 ... supplied to the GYM as the ‘vector of recruitments’ input option to simulate the population dynamics of ... The annual catch of Antarctic krill (Euphausia superba) in the Scotia Sea (FAO Statistical Subareas ... 48.1, 48.2, 48.3 and 48.4) is limited by a trigger level of 620 000 tonnes until a procedure for ... division of the precautionary catch limit of 5.61 million tonnes into smaller management units has been ... approach that can be used to compare population responses to proposed levels of harvest against decision ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 81–96 : Auteur(s): Kinzey, D., G. Watters and C.S. Reiss
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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 ... interaction over access to resources, which often includes a combination of socio-economic, ecological and ... conservation issues. However, estimating the amount of resource depredated can be especially challenging when ... aimed at providing two indirect methods of assessment of depredated biomass over an 11-year period (2003 ... , such as estimating the amount of biomass loss caused by predators. While these losses can be directly ... loss. This study therefore aims to: (i) update the pre- vious estimation of the level of depredation ... tested by analysing the influence of the CPUE in the absence of odontocetes on the CPUE loss caused by ... absence and the presence of odontocete depredation and estimated a mean CPUE loss per cell (c). CPUE ...
Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 1–14 : Auteur(s): Gasco, N., P. Tixier, G. Duhamel and C. Guinet
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Joinville–D’Urville Islands (Subarea 48.1) – a former fishing ground for the spiny icefish (Chaenodraco wilsoni), at the tip of the Antarctic Peninsula – revisited
icefish (Chaenodraco wilsoni), at the tip of the Antarctic Peninsula – revisited Abstract / Description ... : The former fishing ground off Joinville–D’Urville Islands was revisited in the course of the Antarctic ... Expedition ANT XIX/3 by RV Polarstern in February 2002. Five hauls were conducted north of the two islands at ... depths of 149 to 282 m on 21 February 2002. Published and unpublished reports from fishing operations in ... (Pleuragramma antarcticum). When fi sh reached 4 years of age they moved to the east again. They fi rst ... adult females caught (n = 10) suggested that C. rastrospinosus was in the middle of the spawning ... the middle of its spawning season when taken in the second half of February. Sosinski et al. (1981 ... GROUND FOR THE SPINY ICEFISH (CHAENODRACO WILSONI), AT THE TIP OF THE ANTARCTIC PENINSULA – REVISITED ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 1–20 : Auteur(s): Kock, K.-H., L. Pshenichnov, C.D. Jones, K. Shust, K.E. Skora and Zh.A. Frolkina
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Estimation of natural mortality using catch-at-age and aged mark-recapture data: a multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation.
Paper Title: Estimation of natural mortality using catch-at-age and aged mark-recapture data: a ... , using multiple cohorts and multiple years of catch-at-age and aged mark-recapture data was tested using ... simulation. Alternative fishing selectivity functions of age of dome-shaped versus sigmoidally shaped were ... number of recaptures-at-age and model the population numbersat- age by annual difference equations ... Science, Vol. 18 (2011): 1–27 Estimation of natural mortality using CatCh-at-agE and agEd mark ... Equations vErsus a nEw mortality Equation S.G. Candy Australian Antarctic Division Department of ... multiple cohorts and multiple years of catch-at-age and aged mark-recapture data was tested using ... simulation. Alternative fishing selectivity functions of age of dome-shaped versus sigmoidally shaped were ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Auteur(s): Candy, S.G.
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Status of krill target strength
Paper Title: Status of krill target strength Abstract / Description: Empirical estimates for the ... target strength of krill are extracted from publications. These are confined to measurements on ... aggregations of live euphausiids and should not be affected by a frequent cause of bias in single-animal ... -cylinder scattering model assuming specific sets of physical and orientational parameters, for which there ... WG-KRll.L-92/11 STATUS OF KRILLTARGET STRENGTH K.G ... . Foote1, D. Chu2 and T.K. Stanton2 Abstract Empirical estimates for the target strength of krill are ... extracted from publications. These are confined to measurements on aggregations of live euphausiids and ... should not be affected by a frequent cause of bias in single-animal measurements, namely thresholding ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 101–126 : Auteur(s): Foote, K.G., D. Chu and T.K. Stanton
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Options for allocating the precautionary catch limit of krill among small-scale management units in the Scotia Sea
Paper Title: Options for allocating the precautionary catch limit of krill among small-scale ... management units in the Scotia Sea Abstract / Description: Following an assessment of Antarctic krill ... (Euphausia superba) in the Scotia Sea, CCAMLR established a precautionary catch limit of 4 million tonnes and ... catch limit for krill among the SSMUs so as to preclude the inadvertent concentration of catches in a ... season availability of krill (e.g. arrival weights, egg mass, natality rate, foraging trip duration ... and 4% to the South Georgia East (SGE) SSMU following the distribution of colonies reported by ... OPTIONS FOR ALLOCATING THE PRECAUTIONARY CATCH LIMIT OF KRILL AMONG SMALL-SCALE MANAGEMENT UNITS IN THE ... of Antarctic krill (Euphausia superba) in the Scotia Sea, CCAMLR established a precautionary catch ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 81–97 : Auteur(s): Hewitt, R.P., G. Watters, P.N. Trathan, J.P. Croxall, M.E. Goebel, D. Ramm, K. Reid, W.Z. Trivelpiece and J.L. Watkins
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Acoustic data analysis and models of krill spatial distribution
Paper Title: Acoustic data analysis and models of krill spatial distribution Abstract ... descriptors of krill spatial aggregation: power spectra for krill biomass fluctuations in space, semivariogram ... (spatial autocorrelation of krill biomass) and the frequency distribution of krill biomass estimate. The ... wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 km the ... , 85 pp. MARR, J.W. 1962. The natural history and geography of Antarctic krill Euphausia superba ... OF KRILL SPATIAL DISTRIBUTION A. Morin, A. Okubo and K. Kawasaki Abstract Acoustic data ... obtained on 4-5 January 1987 aboard the RN ProfesSor Siedlecki were used in three descriptors of krill ... autocorrelation of krill biomass) and the frequency distribution of krill biomass estimate. The wavenumber ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Auteur(s): Morin, A., A. Okubo and K. Kawasaki