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ACOUSTIC CHARACTERIZATION OF SWARMS OF ANTARCTIC KRILL (EUPHAUSIA SUPERBA) FROM ELEPHANT ISLAND AND BRANSFIELD STRAIT

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ABSTRACT Time series of acoustic observations with three frequencies were made on Antarctic krill (Euphausia superba) near Elephant Island and in Bransfield Strait. Local changes of biomass were ten-fold over 2-3 days. The total biomass in a very large swarm near Elephant Island was 2.1 million metric tons distributed over 450 km2. The abundance in the swarm was 200–-500 g/m3 over a vertical extent from 10-240 m. Smaller patches were 40-150 g/m3 and often associated with the 100-150 m bottom contour. Assessing the distribution and abundance of very large swarms presents problems beyond those of routine acoustic surveys.

Affiliations: 1: (MCM) Northwest and Alaska Fisheries Center, Resource Assessment and Conservation Engineering Division, Seattle, Washington 98115;; 2: (TSE and OAM) School of Oceanography, College of Ocean and Fishery Sciences, University of Washington, Seattle, Washington 98105.

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/content/journals/10.1163/1937240x84x00480
1984-01-01
2016-12-11

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