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Echogram noise removal can remove significant amounts of krill backscatter

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Document Number:
WG-ASAM-2021/07
Author(s):
G. Macaulay, G. Skaret and B. Krafft
Submitted By:
Dr Gavin Macaulay
Approved By:
Dr Bjørn Krafft (Norway)
Agenda Item(s)
WG-ASAM-2021 - 3 - Survey design for future routine biomass estimates
Abstract

A maximum threshold setting in the noise removal part of the Echoview template used for acoustic krill biomass estimation can remove significant amounts of krill backscatter. A revised threshold setting is proposed and applied to the 2019 International Synoptic Krill survey in Area 48, resulting in a 16% increase in the biomass estimate.