Resultados de la búsqueda
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FIELD IDENTIFICATION GUIDE TO HEARD ISLAND AND MCDONALD ISLAND (HIMI) BENTHIC INVERTEBRATES
Abstract: At CCAMLR-XXVI the Working Group on Fish Stock Assessment (WG-FSA) noted a lack of ... specific reference material for the identification of benthic invertebrates in areas specific to which ... observers carry out their activities (SC-CAMLR-XXVI: Annex 5, paragraph 6.32). To improve the standard of ... observer identifications and also to assist in the identification of vulnerable areas, the Scientific ...
Meeting Document : WG-FSA-08/59 : Autor(es): T. Hibberd and K. Moore (Australia)
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A comparison of Antarctic krill (Euphausia superba Dana) caught by nets and taken by macaroni penguins (Eudyptes chrysolophus Brandt): evidence for selection?
) breeding at Bird Island, South Georgia and concurrent net samples caught within the penguin foraging range ... , we examined the potential selection of different length and maturity stages of Antarctic krill ... (Euphausia superb a Dana). Using Monte Carlo randomised simulation techniques we also determined the ... probability of obtaining length-frequency distributions of krill different from that obtained from the net ...
Meeting Document : WG-EMM-96/08 : Autor(es): Croxall, J.P., Hill, H.J., Trathan, P.N., Watkins, J.L.
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Reproduction in Antarctic notothenioid fish - a review
although spawning is likely to take place annually. However, part of the populations of Champsocephalus ... gunnari in the Atlantic Ocean sector do not spawn each year. Gonadosomatic index (GSI) of females is 15–40 ... % at spawning. Apart from a few nototheniid species the GSI of males is much less and typi6dlly only 15 ... it is not attained until 70–80% of the maximum length. The only exception is Champsocephalus gunnari ...
Meeting Document : SC-CAMLR-X/BG/12 : Autor(es): Delegation of Germany
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Analysis of variability of krill size and fish by-catch in Japanese krill fishery based on scientific observer data
Antarctic krill commercial fishing vessels, we estimated the relationship between statistical precision and ... –2008 were analysed by using a hierarchical Bayesian model. The models were composed of multistage ... biological process error in the population dynamics from fishery process as observation error. In both krill ... length and bycatch fish number, the parameters estimated by MCMC hardly show difference among years, sub ...
Meeting Document : WG-EMM-12/68 : Autor(es): T. Okuda and M. Kiyota (Japan)
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Distribution, density and relative abundance of Antarctic krill estimated by maximum likelihood geostatistics on acoustic data collected during commercial fishing operations
Abstract: There is a substantial harvestfor Antarctic krill in the Southern Ocean, butlittle ... regular scientific monitoring of the resource. Recently, however, the Commission for the Conservation of ... fisheries to increase the amount of relevant information available for making management decisions. We here ... the vessel ‘Saga Sea’ were processed to produce probability of presence, conditional density and ...
Meeting Document : WG-EMM-16/P12 : Autor(es): E.J. Niklitschek and G. Skaret
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Evaluation of some processing techniques applied to acoustic recordings from two krill fishing vessels
Abstract: Acoustic data from krill fishing vessels have the potential to provide useful ... contributions to assess local krill abundance and distribution, and even as input to the CCAMLR feedback ... management system under development. The possibility to collect such data from the fleet has been ... demonstrated through a CCAMLR proof of concept, but processing is in most cases essential before any use of the ...
Meeting Document : SG-ASAM-17/03 : Autor(es): X. Wang, G. Skaret and O.R. Godø
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Assessing data requirements for tag-based estimates of local biomass in data-poor and exploratory fisheries
Research Block 5843a_1 with a fixed exploitation rate and various tagging rate scenarios to assess the ... impact on the numbers of tagged fish recaptures and accuracy of tag-based estimates using the Chapman ... estimator. The results showed that tag-based biomass estimates obtained from a low numbers of recaptures ... Chapman-estimates to achieve a 25% level of accuracy at least 50% of the time, required a minimum of 6 ...
Meeting Document : WG-SAM-17/13 : Autor(es): L. Robinson, P. Burch and K. Reid
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WS-BSO-07
Full Name: Workshop on Bioregionalisation of the Southern Ocean Location: Brussels, Belgium Date ... mega fauna on shelf areas of the Southern Ocean Atlantic sector S.J. Lockhart and C.D. Jones (USA) WS ... and H.J. Griffiths (UK) WS-BSO-07/12 Spatial disposition of euphausiid larvae in relation with the ... diversity G.W. Hosie (Australia) WS-BSO-07/5 Spatial patterns of temporal relationships in the Southern ...
Meeting
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Developing priority variables (“ecosystem Essential Ocean Variables” – eEOVs) for observing dynamics and change in Southern Ocean ecosystems
underlying causes are needed to report on their status and to guide management. Here we use the Framework on ... Ocean Observing (FOO) to begin developing ecosystem Essential Ocean Variables (eEOVs) for the Southern ... appropriate spatial and temporal scales and are useful to the extent that they contribute to direct estimation ... support assessments. In this paper we outline the rationale, including establishing a set of criteria, for ...
Meeting Document : WG-EMM-16/P11 : Autor(es): A.J. Constable, D.P. Costa, O. Schofield, L. Newman, E.R. Urban Jr., E.A. Fulton, J. Melbourne-Thomas, T. Ballerini, P.W. Boyd, A. Brandt, W. de la Mare, M. Edwards, M. Eléaume, L. Emmerson, K. Fennel, S. Fielding, H. Griffiths, J. Gutt, M.A. Hindell, E.E. Hofmann, S. Jennings, H.S. La, A. McCurdy, B.G. Mitchell, T. Moltmann, M. Muelbert, E. Murphy, T. Press, B. Raymond, K. Reid, C. Reiss, J. Rice, I. Salter, D.C. Smith, S. Song, C. Southwell, K.M. Swadling, A. Van de Putte and Z. Willis
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On peculiarities of icefish (Champsocephalus gunnari) vertical distribution in different habitats
Abstract: The significant similarity of Kerguelen and South Georgia icefish Ch.gunnari ... populations ecology has been revealed. Fish of all lengths and ages are planktonphages. Fish of the first two ... age groups have been continuously found in the pelagic layer off South Georgia and Kerguelen-Heard ... . Immature fish also partially distribute in the pelagic layer both in the daytime and at night. Mature fish ...
Meeting Document : WG-FSA-03/54 : Autor(es): J.A. Frolkina (Russia) and V.V. Herasimchuk (Ukraine)