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. 2020 Mar 13;20(6):1614. doi: 10.3390/s20061614

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Seasonal dynamics of biomass in the water column (vertical axis) as observed in the acoustic records from October 2013 to June 2014 (horizontal time axis). The acoustic system also observes with seconds and cm resolution giving access to, for example, individual fish behavior information by depth (vertical axis). High biomass densities are defined by red color and biomass is gradually decreasing when the color goes towards blue. No biomass is recorded when the echogram is white (processed from LoVe data by E. Johnsen, Institute of Marine Research, Bergen).