Found from the surface to about 1,640 ft (500 m) depth. They congregate under and around sea ice edges to feed. Swarms may extend under the sea ice to about 8 mi (13 km) in from the edge, especially in the winter. Areas just south of sea ice edges have been found to have especially high krill densities. Juveniles in particular seek haven from predators in small crevices in the ice. Larger topographical features under the ice such as keels and pressure ridges also attract higher krill densities.

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