Search results
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A perspective on steepness, reference points, and stock assessment
these patterns. For the production model, we derive explicit relationships for steepness and life ... history parameters and then for steepness and major reference points. For the age-structured model, we are ... required to generally use numerical computation, and so we provide an example that complements the ... analytical results of the production model. We discuss what it means to set steepness equal to 1 and how to ...
Meeting Document : WG-FSA-14/P05 : Author(s): M. Mangel, A.D. MacCall, J. Brodziak, E.J. Dick, R.E. Forrest, R. Pourzand and S. Ralston
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Relative selectivity of four sampling methods using traps and trawls for male snow crabs (Chionoecetes opilio)
deployed during the day. and (4) bottom trawl deployed at night. Catches were characterized in terms of ... , were larger than those caught in the trawl; the size of crabs caught in the trawl at night was larger ... than those caught during the day; 2) large-clawed crabs predominated in the catches from traps whereas ... small-clawed animals predominated in the trawl catches; 3) soft-shell crabs were more common in trawl ...
Meeting Document : WS-CRAB-93/11 : Author(s): J.M. Hoenig and E.G. Dawe (USA)
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Part 1. Seabird assemblages during trawling operations
Abstract: Our knowledge of seabird assemblage composition and abundance at-sea is limited by the ... the stern rather than the bow of the vessel. The information was collected as part of the project ... "Finfish distribution and abundance in Subareas 48.1 and 48.2" developed by the Pontificia ... Universidad Católica de Valparaíso on board the fishing vessel Cabo de Hornos, between January 21 and February ...
Meeting Document : WG-FSA-16/20 : Author(s): J.A. Arata
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Light levels experienced by foraging Antarctic fur seals, Arctocephalus gazella
Abstract: This study examined the feasibility of using time depth recorders (TDRs) to measure ... (Arctocephalus gazella) at Bird Island, South Georgia (54° 00' S 38° 02' W) in the 1994/5 austral ... the surface illumination when diving. Illuminance ranged from full sunlight (102 lux) at the surface ... to minimum starlight (10-6 lux) at night and during deep daytime dives. The change in il1uminance ...
Meeting Document : WG-EMM-99/28 : Author(s): D.J. McCafferty, I.L. Boyd and T.R. Walker (UnitedKingdom)
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On influence of acoustic survey methodology improvement on krill biomass estimation. (A comparison of results of acoustic surveys based on single-frequency and double-frequency algorithms)
krill surveys have taken place for the recent twenty years. It has been attempted to determine the ... influence of such improvements on krill biomass estimation. The letter seems to become useful in comparative ... analysis of krill biomass data from the results of different acoustic surveys. There have been presented ... the results of krill biomass comparative estimation by single-frequency and double-frequency ...
Meeting Document : WG-EMM-01/41 : Author(s): S.M. Kasatkina and A.P. Malyshko (Russia)
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Oxygen and carbon stable isotopes in otoliths record spatial isolation of Patagonian toothfish (Dissostichus eleginoides)
Abstract: Strong contrasts in ambient isotope ratios and in diet suggest stable isotopes in the ... Patagonian toothfish (Dissostichus eleginoides) sampled off the Patagonian Shelf and South Georgia, on either ... distinguish South American-caught fish from those taken in the Antarctic. Values of δ18O and δ13C predicted ... capture area with 100% success, validating their use for distinguishing provenance and corroborating the ...
Meeting Document : WG-FSA-08/P03 : Author(s): J.R. Ashford and C.M. Jones
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Variation in reproductive performance of seabirds and seals at South Georgia, 1976–1986 and its implications for southern ocean monitoring studies
Abstract: Aspects of the reproductive performance of Black-browed, Grey-headed and Wandering ... Georgia over the last decade (and similar data for Adelie and Chinstrap Penguins at Signy Island, South ... Orkney Islands) are summarised and reviewed. Breeding success of the Wandering Albatross, which breeds in ... significantly. The other species at South Georgia, which breed in summer and for which krill forms a significant ...
Meeting Document : SC-CAMLR-VI/BG/15 : Author(s): J.P. Croxall, T.S. McCann, P.A. Prince and P. Rothery (United Kingdom)
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Variation or reproductive performance of seabirds and seals at South Georgia, 1976–1986 and its implication for Southern Ocean monitoring studies
Abstract: Aspects of the reproductive performance of Black-browed, Grey-headed and Wandering ... Georgia over the last decade (and similar data for Adelie and Chinstrap Penguins at Signy Island, South ... Orkney Islands) are summarised and reviewed. Breeding success of the Wandering Albatross, which breeds in ... / significantly. The other species at South Georgia, which breed in summer and for which krill forms a significant ...
Meeting Document : WG-CEMP-87/13 : Author(s): J.P. Croxall, T.S. McCann, P.A. Prince and P. Rothery (United Kingdom)
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Interactions between seabirds and deep water hake trawl gear: an assessment of impacts in South African waters 2004/05
Abstract: This study estimates the mortality of seabirds in the South African deep water hake ... of fishery wastes. Using a bootstrapping approach to estimate 95% confidence intervals (CI), the ... the total impact of the fishery requires assumptions about total fishing effort, the proportion of ... trawls where dumping takes place and the average duration of dumping. A simple model was developed which ...
Meeting Document : WG-FSA-06/41 : Author(s): B.P. Watkins, S.L. Petersen and P.G. Ryan (South Africa)
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Target strength of Antarctic krill
=-69db). Net samples obtained immediately before the experiment indicate that the animals were ... target strength based on extrapolations of other field experiments using the bent cylinder model of sound ... scattering by elongated zooplankters. The modal value of the measurements is 6.7dB lower than that predicted ... by the BIOMASS equation for 47.44mm krill. Author(s): R.P. Hewitt and D.A. Demer (USA) Title ...
Meeting Document : WG-KRILL-91/13 : Author(s): R.P. Hewitt and D.A. Demer (USA)