Echogram noise removal can remove significant amounts of krill backscatter

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Numéro du document:

WG-ASAM-2021/07

Auteur(s):

G. Macaulay, G. Skaret and B. Krafft

Soumis par:

Gavin Macaulay

Approuvé par:

Bjørn Krafft (Norvège)

Point(s) de l'ordre du jour

WG-ASAM-2021 - 3 - Survey design for future routine biomass estimates

Résumé

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.