Resultados de la búsqueda
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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
CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable in a ... generalised linear model (GLM) with a square-root link function and a unit variance function. A time series of ... ) estimated using a profile extended quasi-likelihood, and a log link function with log of effort as an offset ... model (GLMM), in order to provide more efficient estimates of the standardised CPUE time series and more ... eleginoides) for CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable ... time series of standardised CPUE estimates and their precision can be obtained from the ‘fi shing year ... parameter (λ) estimated using a profi le extended quasi-likelihood, and a log link function with log of ... linear mixed model (GLMM), in order to provide more effi cient estimates of the standardised CPUE time ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 59–80 : Autor(es): Candy, S.G
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A hypothetical life cycle for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region
Sea region Abstract / Description: Aspects of the reproduction, size distribution and movements of ... location and timing of spawning and the probable early life-history characteristics of toothfish, the drift ... of eggs and larvae over a 6–24 month period were investigated using an oceanic circulation model ... locations of toothfish larvae after an 18–24 month period were moderately consistent with the distribution ... those in the south, found on the shelf and slope. The objective of the current paper is to develop a ... National Institute of Water and Atmospheric Research (NIWA) Ltd PO Box 893 Nelson, New Zealand Email ... – s.hanchet@niwa.co.nz G.J. Rickard National Institute of Water and Atmospheric Research (NIWA) Ltd ... , Karori Wellington, New Zealand A. Dunn and M.J.H. Williams National Institute of Water and ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 35–53 : Autor(es): Hanchet, S.M., G.J. Rickard, J.M. Fenaughty, A. Dunn and M.J. Williams
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Cephalopod research in the Antarctic
major component of the Antarctic marine food web and it seems inevitable that they will be the subject ... of future commercial exploitation. Research is being carried out at BAS on the species composition ... and distribution of Antarctic cephalopods, their production and biomass, population dynamics and ... policy for management of Antarctic cephalopods. In view of the rapidity that cephalopod fisheries can ... of cephalopods as predators and prey in the Southern Ocean ecosystem. - 326 - This paper ... . Rodhouse (United Kingdom) Abstract SC-CAMLR-VI/BG/ll Cephalopods are a major component of the ... Antarctic marine food web and it seems inevitable that they will be the subject of future commercial ... exploitation. Research is being carried out at BAS on the species composition and distribution of Antarctic ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 323-334 : Autor(es): Rodhouse, P.G.
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Otolith and body size relationships in bigeye grenadier (Macrourus holotrachys) in CCAMLR Subarea 48.3
CCAMLR Subarea 48.3 Abstract / Description: A large sample of otoliths from bigeye grenadier (Macrourus ... 48.3 was measured and weighed, and the usefulness of otoliths as predictors of fish size was determined ... . Otolith mass provides good estimates of fish length, whereas otolith length and width measurements provide ... less accurate estimates of fish length. Seasonal variations in fish mass with reproductive condition ... , Madingley Road Cambridge CB3 0ET, United Kingdom Email – markb@bas.ac.uk Abstract A large sample of ... (Dissostichus eleginoides) fi shery in Subarea 48.3 was measured and weighed, and the usefulness of otoliths as ... predictors of fi sh size was determined. Otolith mass provides good estimates of fi sh length, whereas ... otolith length and width measurements provide less accurate estimates of fi sh length. Seasonal ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 133–143 : Autor(es): Morley, S. and M. Belchier
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Can we satisfactorily estimate variation in krill abundance?
: Knowledge of abundance and rates of change of abundance are basic requirements for fisheries models. Catch ... of abundance. It is less satisfactory for pelagic fisheries. Evidence is given that CPUE estimated ... from data reported to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR ... ) does not provide a realistic index of krill abundance. Recognising that there is a large natural year ... SATISFACTORILY ESTIMATE VARIATION IN KRILL ABUNDANCE?* I. Everson1 (United Kingdom) Abstract Knowledge of ... abundance and rates of change of abundance are basic requirements for fisheries models. Catch per unit ... effort (CPUE) has traditionally been used in demersal fisheries assessments as an estimator of ... reported to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) does not ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 375-376 : Autor(es): Everson, I.
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Statistical problems in krill stock hydroacoustic assessments
: Two primary issues are at question for hydroacoustic assessments of krill. The first is the methods ... applied to establish biomass in a survey area and the second is the improvement in accuracy of target ... -strength measurements. In the case of statistical methods, there are no clear guidelines for deciding what ... does not invalidate the use of available methods to conduct surveys and analyze results. In the case of ... assessments of krill. The first is the methods applied to establish biomass in a survey area and the second ... is the improvement in accuracy of target-strength measurements. In the case of statistical methods ... well addressed by present techniques. However, this does not invalidate the use of available methods ... to conduct surveys and analyze results. In the case of target-strength accuracy, even if the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Autor(es): Macaulay, M.C.
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Krill (Euphausia superba Dana) resources and distribution in the Wilkes Land area in the seasons 1986 to 1989
the seasons 1986 to 1989 Abstract / Description: Results of krill (Euphausia superba Dana) resource ... account an area to the north of the edge of the continental slope. Each subarea was described in terms of ... the number of krill aggregations, regularity of their observations, krill density and total krill ... conditions and extent of the ice cover. If ice conditions are favourable, the subarea between 143° and 150°E ... paper in terms of distribution and total biomass of Euphausia superba. Fishing for krill was done by a ... V.P.Timonin* Abstract Results of krill (Euphausia superba Dana) resource surveys carried out along the ... the north of the edge of the continental slope. Each subarea was described in terms of the number of ... krill aggregations, regularity of their observations, krill density and total krill biomass. It was ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 149–162 : Autor(es): Dolzhenkov, V.N. and V.P.Timonin
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Killer whale (Orcinus orca) and sperm whale (Physeter macrocephalus) interactions with longline vessels in the Patagonian toothfish fishery at South Georgia, South Atlantic
). Demersal longlines, targeting Patagonian toothfish (Dissostichus eleginoides), were deployed in depths of ... most abundant marine mammal observed in the vicinity of vessels when lines were being hauled, being ... present during 24% of hauling observations. Killer whales, the second most frequently sighted cetacean ... , were present during 5% of haul observations. A high inter-vessel variation was noted for interactions ... – martinpurves@telkomsa.net D.J. Agnew Renewable Resources Assessment Group Imperial College, Royal School of ... longlines, targeting Patagonian toothfi sh (Dissostichus eleginoides), were deployed in depths of 169 to 2 ... abundant marine mammal observed in the vicinity of vessels when lines were being hauled, being present ... during 24% of hauling observations. Killer whales, the second most frequently sighted cetacean, were ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 111–126 : Autor(es): Purves, M.G., D.J. Agnew, E. Balguerías, C.A. Moreno and B. Watkins
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Commercial fishing vessels as research vessels in the Antarctic – requirements and solutions exemplified with a new vessel
readily available for conventional coverage of harvested stocks and their ecosystems. This paper describes ... in the ecosystems of the Antarctic region require a precautionary approach with respect to the human ... use of these ecosystems. In particular, resource harvesting requires enough basic knowledge, as well ... ecosystem. Due to the vastness and remoteness of the Antarctic region, research vessel capacity is not ... paper describes the potential of using commercial fishing vessels to bridge the gap in research vessel ... enable col- lection of scientific information. This paper takes a more long-term perspective and its ... The Antarctic region is vulnerable to human activity. In particular, under the impact of global ... a result of ice reduction (Flores et al., 2012a; Flores et al., 2012b; Melbourne-Thomas et al ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 11–17 : Autor(es): Godø, O.R., C. Reiss, V. Siegel, J.L. Watkins
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Spatially explicit population dynamics models for Antarctic toothfish in the Ross Sea region
dynamics of spatial heterogeneity of the population along with age structure, movement and reproductive ... region and used as operating models to evaluate the performance of single-area assessments. The models ... shapes of the preference functions were established through iterative model testing whilst the parameters ... defining the preference functions were estimated within each model. The spatial structure of the models ... ; Pollock et al., 1991; Welsford and Ziegler, 2013). The aims of this paper were two-fold. The first was ... , the spatial structure and movement of fish has shown the potential to have a strong influ- ence on ... , risking overexploitation of those stocks (e.g. Ying et al., 2011). Spatially explicit stock assessments ... modelling of move- ment of fish populations between areas has general- ly been either where migration ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 19–37 : Autor(es): Mormede, S., A. Dunn, S. Hanchet and S. Parker