| Summary: | Progress Code: completed Statement: There are no problems with the file, but a copy of the Echoview(R) software (https://www.echoview.com/) is required to open the file and an Echoview(R) license is necessary to access all the functionality in the file. Purpose The purpose of this file is to detail the workflow for krill identification and echo integration used during the BROKE-West survey. The file has the workflow for noise removal, surface and seabed echo removal, krill identification and echo integration. The attached file details the workflow for the processing and analysis of active acoustic data (Simrad EK60; 12, 38, 120 and 200 kHz) collected from RSV Aurora Australis during the 2006 BROKE-West voyage. The attached file is in Echoview(R) (https://www.echoview.com/) version 8 format. The Echoview file is suitable for working with fisheries acoustics, i.e. water column backscatter, data collected using a Simrad EK60 and the file is set-up to read 38, 120 and 200 kHz split-beam data. The file has operators to remove acoustic noise, e.g. spikes and dropped pings, and operators for removing surface noise and seabed echoes. Echoes arising from krill are isolated using the ‘dB-difference’ method recommended by CCAMLR. The Echoview file is set-up to export the results of krill echo integration as both intervals and swarms. Full details of the method are available in Jarvis et al. (2010) and the krill swarms methods are described in Bestley et al. (2017).
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