Search results
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The development of spatially and temporally controlled measures of survival and tag-detection for the CCAMLR tagging program
management by CCAMLR of a number of toothfish fisheries in Antarctica. The evaluation of the tagging ... programme relies on two key aspects (i) that the tagged fish have a good chance of survival and (ii) that ... tagging performance in relation to these two aspects has been thus far inconclusive because of confounding ... factors such as time and location of tagging and subsequent fishing effort, as well as size of fish tagged ...
Meeting Document : WG-SAM-12/30 : Author(s): S. Mormede and A. Dunn (New Zealand)
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A model at the level of the foraging trip for the indirect effects of krill (Euphausia superba) fisheries on krill predators
Abstract: 1. Although the development of fisheries for krill in the southern oceans has prompted ... considerable work on the indirect effects of fisheries on krill predators, to date all work has focused on ... population level effects. Here, we present for. the first time a model at the level of the foraging trip for ... the effects of a fishery on krill predators, using the Adelie penguin (Pygoscelis adeliae) as a model ...
Meeting Document : WG-EMM-96/20 : Author(s): Switzer, P.V., Mangel, M.
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Considerations on the design and evaluation of surveys for estimating recruitment of Patagonian toothfish (Dissostichus eleginoides) with preliminary outcomes for the Heard Island plateau region (Division 58.5.2)
Abstract: Assessments of long-term sustainable yield using the Generalised Yield Model and the ... setting of total allowable catches (TAC) for Patagonian Toothfish, Dissostichus eleginoides, for the Heard ... design for Division 58.5.2 is reviewed and estimates of optimal distribution of trawl stations among ... strata provided for estimates of abundance of individual pre-recruitment age classes and total abundance ...
Meeting Document : WG-FSA-SAM-04/19 : Author(s): Candy, S., Constable, A.J., Davies, C.R.
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Model-based mapping of assemblages for ecology and conservation management: A case study of demersal fish on the Kerguelen Plateau
of Common Profile (RCP) to quantify and map the distribution of demersal fish assemblages in an ... ecologically significant region of the Southern Ocean to a) gain ecological and management insights and b ... ) evaluate the utility of the new method for ecoregionalisation. The RCP approach is a multi-species, model ... -based approach that can overcome many limitations of traditional distance-based approaches. It ...
Meeting Document : WS-SM-18/P02 : Author(s): N.A. Hill, S.D. Foster, G. Duhamel, D. Welsford, P. Koubbi and C.R. Johnson
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Krill of the Ross Sea: distribution, abundance and demography of Euphausia superba and Euphausia crystallorophias during the Italian Antarctic expedition (January–February 2000)
) were analysed to obtain a general picture of the summer distribution pattern, abundance and demography ... of krill in the western Ross Sea (Antarctica). A midwater sampler-trawl (Hamburg Plankton Net) was ... used to collect zooplankton and fish larvae. Mean relative biomass of Antarctic krill Euphausia superba ... , in the area north of Continental Shelf, was 9.3 g/1000m3 of filtered water with a mean density of ...
Meeting Document : WG-EMM-02/32 Text : Author(s): A. Sala, M. Azzali and A. Russo (Italy)
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Modelling the consequences of Antarctic krill harvesting of Antarctic fur seals
Abstract: In terms of the convention governing the Commission for the Conservation of Antarctic ... should take the needs of the predators of krill into account in order to reduce the risk of deleterious ... an annual krill catch limit, which is expressed as a proportion (??= 0.116) of a survey biomass ... estimate. This approach takes the needs of predators into account in only a crude way by assuming that a ...
Meeting Document : WG-EMM-01/66 : Author(s): R.B. Thomson, D.S. Butterworth (South Africa), I.L. Boyd and J.P. Croxall (United Kingdom)
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CCAMLR spatial management GIS: potential applications for informing the development of a representative system of MPAs
GIS facilitates easy mapping of CCAMLR’s spatial management framework and associated conservation ... measures, and standardises this information in terms of projection and coastline position. Access to ... spatially derived parameters through the database may be useful in the design and implementation of ... protected areas as part of the development of a representative system of Antarctic marine protected areas ...
Meeting Document : WS-MPA-11/20 : Author(s): S.M. Grant, S.L. Hill and P.T. Fretwell (UK)
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Comparison of estimators of effective sample size for catch-at-age and catch-at-length data using simulated data from the Dirichlet-multinomial Distribution
Abstract: The incorporation of “effective sample size” (ESS) in integrated assessments is an ... approximate but simple way of modelling the distribution of catch-at-age or catch-at-length frequencies using ... frequencies. The ESS applied within the definition of the negative log-likelihood contribution to the ... -length frequency data relative to the other types of data used in integrated assessments of toothfish ...
Meeting Document : WG-SAM-07/7 : Author(s): S.G. Candy (Australia)
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On the state of Champsocephalus gunnari stock in Subarea 48.3 and methods of its assessment
2000 showed clearly a necessity to revise the methods of icefish (which is near-bottom and pelagic fish ... species) biomass assessment based on the results of bottom trawl surveys. A question on unreliability of ... stock assessment was repeatedly raised on the meetings of Working Group on Fish Stock Assessment (WGFSA ... ) both during the period of the icefish fishery in 1980s and after its ceasing in 1990s. In all cases, a ...
Meeting Document : WG-FSA-00/45 : Author(s): K. Shust, V. Senioukov, P. Gasiukov and A. Kozlov (Russia)
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On possibility of using acoustic method to improve quality of Champsocephalus gunnari biomass estimates in Subarea 48.3
Abstract: An attempt has been made to study icefish as an object of acoustic survey basing on the ... acoustic and biological data obtained by Russian RN ATLANTIDA in the area of South Georgia Island (January ... -February 2000). Estimation of possible target strength values was made by a comparison to TS of other fish ... and physical body properties. There has been proved a comparability of Ch.gunnari length frequencies ...
Meeting Document : WG-FSA-00/31 : Author(s): S. Kasatkina (Russia)