Résultats de la recherche

1. Broadbandwidth total target strength measurements of Antarctic krill (Euphausia superba) from reverberation in a cavity

   Abstract:  Total scattering cross-sections (st) of Antarctic krill, Euphausia superba, were ... strengths (??10log(??4?) t TTS), were measured from groups of 57 to 1169 krill (average standard length ... omnidirectional emitter into one of three glass carboys containing groups of krill swimming in 9.3, 19.3 or 45.9 l ... of seawater (0.6??temperature??3.6 °C). Between each pulse, the krill moved within the fixed-boundary ...

   Meeting Document : WG-EMM-02/49 : Auteur(s): D.A. Demer and S. G. Conti (USA)

2. An acoustic estimation of krill densities to the north of South Georgia in January 1994

   krill from other acoustic targets. A generic target strength to weight relationship was used to derive ... krill densities from 120 kHz signals attributed krill. At less than 1 g m-2, mean weighted krill ... provide further evidence of an extreme krill paucity around South Georgia in the 1993/4 season. Author(s ... ):  Watkins, J.L., Brierley, A.S. Title:  An acoustic estimation of krill densities to the north of South ...

   Meeting Document : WG-EMM-95/74 : Auteur(s): Watkins, J.L., Brierley, A.S.

3. A simulation study of krill fishing by an individual Japanese trawler (SC-CAMLR-VI/BG/37)

   Japanese krill trawler over a half-month period. It is based on an underlying krill distribution model ... : artificially elongating krill swarms, and allowing hauls to continue through more than one swarm. Twenty four ... candidate abundance indices (generally of a CPUE form) for krill biomass in the 600 n.mile square oceanic ... overall krill biomass might decline is investigated. Generally the indices respond by dropping relatively ...

   Meeting Document : WS-KCPUE-89/04 : Auteur(s): D.S. Butterworth (South Africa)

4. A simulation study of krill fishing by an individual JAPANESE trawler

   Japanese krill trawler over a half-month period. It is based on an underlying krill distribution model ... : artificially elongating krill swarms, and allowing hauls to continue through more than one swarm. Twenty four ... candidate abundance indices (generally of a CPUE form) for krill biomass in the 600 n.mile square oceanic ... overall krill biomass might decline is investigated. Generally the indices respond by dropping relatively ...

   Meeting Document : SC-CAMLR-VII/BG/37 : Auteur(s): D.S. Butterworth (Invited Expert)

5. Updating the Antarctic krill biomass estimates for CCAMLR Subareas 48.1 to 48.4 using available data

   Abstract:  We present a novel index of Antarctic krill biomass in CCAMLR subareas 48.1 to 48.4 ... variation was significant (CV=73%) but no systematic change in krill biomass was evident during the period ... yield estimate for the krill fishery (which is 9.3%). Biomass indices from local scale acoustic surveys ... the krill stock. This evidence suggests that the trigger level is a highly precautionary operational ...

   Meeting Document : WG-EMM-15/28 : Auteur(s): S. Hill, A. Atkinson, C. Darby, S. Fielding (United Kingsom), B. Krafft, O.R. Godø, G. Skaret (Norway), P. Trathan, J. Watkins (United Kingdom)

6. Evaluation of Antarctic krill biomass and distribution off the South Orkney Islands 2011-2015

   Abstract:  Annual acoustic trawl surveys for krill monitoring have been carried out by the ... early in the fishing season (January/February), using two different krill fishing vessels as platforms ... and abundance of krill near the South Orkneys among years, we here attempt to generate a coherent ... series of krill density estimates from the 5 years of surveys. We follow the CCAMLR protocol for biomass ...

   Meeting Document : WG-EMM-15/54 : Auteur(s): G. Skaret, B.A. Krafft, L. Calise (Norway), J. Watkins (UK), R. Pedersen and O.R. Godø (Norway)

7. A simulation study of krill fishing by an individual Japanese trawler

   Paper Title:  A simulation study of krill fishing by an individual Japanese trawler Abstract ... krill trawler over a half-month period. It is based on an underlying krill distribution model whose ... elongating krill swarms, and allowing hauls to continue through more than one swarm. Twenty four candidate ... abundance indices (generally of a CPUE form) for krill biomass in the 600 n mile square oceanic sector ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 1–108 : Auteur(s): Butterworth, D.S.

8. Circumpolar connections between Antarctic krill (Euphausia superba Dana) populations: Investigating the roles of ocean and sea ice transport

   Abstract:  Antarctic krill, Euphausia superba Dana, has a heterogeneous circumpolar distribution ... in the Southern Ocean. Krill have a close association with sea ice which provides access to a ... pathways of krill have until now been on regional scales and have not taken explicit account of sea ice ... potential roles of the ocean and sea ice in maintaining the observed circumpolar krill distribution. We show ...

   Meeting Document : WG-EMM-07/P10 : Auteur(s): S.E. Thorpe, E.J. Murphy and J.L. Watkins (United Kingdom)

9. On possible influence of continuous krill fishing technology with the use of ‘air-bubbling suspension system’ on ecosystem elements

   Abstract:  It was shown that potential increase in krill fishery in the immediate future ... -krill- fishery interactions. In this case, apart from traditional commercial statistics (vessels ... of studying the krill fishing technology. It is just trawl design and fishing method that will ... , immature and adult krill and other small pelagic species. Obviously, ecological compatibility of krill ...

   Meeting Document : WG-EMM-06/27 : Auteur(s): S.M. Kasatkina and V.A. Sushin (Russia)

10. An 8-year cycle in krill biomass density inferred from acoustic surveys conducted in the vicinity of the South Shetland Islands during the austral summers of 1991/1992 through 2001/2002

    delineating volume backscattering due to Antarctic krill, adjusting for signal contamination due to noise, and ... compensating for diel vertical migration of krill outside of the acoustic observation window. Intra-and inter ... -seasonal variations in krill biomass density and dispersion were derived from the re-processed data set for ... variability may be attributed to changes in the spatial distribution of krill relative to the survey area ...

    Meeting Document : WG-EMM-03/6 : Auteur(s): R.P. Hewitt, D.A. Demer and J.H. Emery (USA)

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