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Biomass of Antarctic krill in the Scotia Sea in January/February 2000 and its use in revising an estimate of precautionary yield

Hewitt, Roger P.; Watkins, Jon; Naganobu, Mikio; Sushin, Viacheslav; Brierley, Andrew S.; Demer, David; Kasatkina, Svetlana; Takao, Yoshimi; Goss, Cathy; Malyshko, Alexander; Brandon, Mark; Kawaguchi, So; Siegel, Volker; Trathan, Philip; Emery, Jennifer; Everson, Inigo; Miller, Denzil. 2004 Biomass of Antarctic krill in the Scotia Sea in January/February 2000 and its use in revising an estimate of precautionary yield. Deep-Sea Research Part II, 51 (12-13). 1215-1236. 10.1016/j.dsr2.2004.06.011

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Abstract/Summary

In January and February 2000, a collaborative survey designed to assess the biomass of Antarctic krill across the Scotia Sea was conducted aboard research vessels from Japan, Russia, the UK and the USA using active acoustic and net sampling. Survey design, sampling protocols, and data analysis procedures are described. Mean krill density across the survey area was estimated to be 21.4 gm(-2), and total biomass was estimated to be 44.3 million tonnes (CV 11.4%). This biomass estimate leads to a revised estimate of precautionary yield for krill in the Scotia Sea of 4 million tonnes. However, before the fishery can be permitted to expand to this level, it will be necessary to establish mechanisms to avoid concentration of fishing effort, particularly near colonies of land-breeding krill predators, and to consider the effects of krill immigrating into the region from multiple sources.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.dsr2.2004.06.011
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Dynamics and Management of Ocean Ecosystems
ISSN: 0967-0645
NORA Subject Terms: Marine Sciences
Biology and Microbiology
Ecology and Environment
Date made live: 18 Jan 2012 09:59
URI: http://nora.nerc.ac.uk/id/eprint/12186

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