[6] Champsocephalus esox is found at depths of 50–250 m (160–820 ft) in the oceans off Patagonia, the Falklands and rarely South Georgia.

[2] A South Georgian study in 1981 collected a specimen with stomach contents of 90% krill (Euphasia superba) and 10% fish.

Champsocephalus esox is of minor importance to commercial fisheries, with catches in 2008 amounting to a total of 90 tonnes.

This species is threatened by climate change leading to warmer water temperatures, mortality as a result of bycatch by artisanal fishers and by invasive salmonids.

The IUCN is listed as Vulnerable and state that additional survey work is required to monitor and understand population status wherever it occurs and that research on its life history and its response to warming waters should be undertaken.