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

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• 作者：Roger P. Hewitt ; Jon Watkins ; Mikio Naganobu ; Viacheslav Sushin ; Andrew S. Brierley ; David Demer ; Svetlana Kasatkina ; Yoshimi Takao ; Cathy Goss ; Alex ; er Malyshko ; Mark Br ; on ; So Kawaguchi ; Volker Sieg
• 关键词：Sea breeze ; Onshore transport ; Drifters ; Neuston ; Baja California
• 刊名：Deep Sea Research Part II: Topical Studies in Oceanography
• 出版年：2004
• 出版时间：June 2004
• 年：2004
• 卷：51
• 期：12-13
• 页码：1215-1236
• 全文大小：635 K

文摘

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 g m⁻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.