Examples of fish distribution in different ice concentrations. Acoustic data (Sv) measured at 38 kHz in the depth interval of 12–450 m over a distance of 2 km. Two main scattering layers of fish are present: an epipelagic (red arrow) and a mesopelagic (pink arrow) layer. The hatched part of the echograms represents the top 12 m excluded from the analysis. Areas below the bottom or considered as noise are in black. For each panel (a–e), ice concentration (% ice cover) is followed by local time at the middle of the transect. DOI: https://doi.org/10.1525/elementa.339.f3