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An investigation of avoidance by Antarctic krill of RRS "James Clark Ross" using the Autosub-2 autonomous underwater vehicle

Record type: Article

The autonomous underwater vehicle (AUV) Autosub-2 was deployed on eight missions ahead of RRS James Clark Ross in the northern Weddell Sea and in the Bransfield Strait, Southern Ocean, to assess avoidance of the research vessel by Antarctic krill Euphausia superba. The AUV was equipped with the same type of scientific echosounder as the research vessel (Simrad EK500 operating at 38 and 120 kHz) and measured the density of krill along transect acoustically (g m-2 wet mass) prior to the ship's arrival. We hypothesised that if krill avoided the ship, perhaps in response to radiated noise, then the ship should detect less krill than the AUV which is known to have much lower noise levels than the ship. We were unable to detect any significant difference between the density of krill detected by the ship or the AUV, either at the transect level or at finer scales within transects. We conclude, therefore, that avoidance by krill of RRS James Clark Ross will not significantly bias acoustic estimates of krill abundance by this vessel.

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Citation

Brierley, A.S., Fernandes, P.G., Brandon, M.A., Armstrong, F., Millard, N.W., McPhail, S.D., Stevenson, P., Pebody, M., Perrett, J.R., Squires, M., Bone, D.G. and Griffiths, G. (2003) An investigation of avoidance by Antarctic krill of RRS "James Clark Ross" using the Autosub-2 autonomous underwater vehicle Fisheries Research, 60, (2-3), pp. 569-576. (doi:10.1016/S0165-7836(02)00144-3).

More information

Published date: 2003
Keywords: acoustic survey, avoidance, autosub, antarctic krill, biomass estimate, euphausia superba, vessel noise

Identifiers

Local EPrints ID: 1297
URI: http://eprints.soton.ac.uk/id/eprint/1297
ISSN: 0165-7836
PURE UUID: 54a8c7c0-a430-4515-ae88-6a14e04f192e

Catalogue record

Date deposited: 15 Apr 2004
Last modified: 17 Jul 2017 17:17

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Contributors

Author: A.S. Brierley
Author: P.G. Fernandes
Author: M.A. Brandon
Author: F. Armstrong
Author: N.W. Millard
Author: S.D. McPhail
Author: P. Stevenson
Author: M. Pebody
Author: J.R. Perrett
Author: M. Squires
Author: D.G. Bone
Author: G. Griffiths

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