Patagonian weasel not been thoroughly studied in the wild, and knowledge of its behavioral patterns is unsure. It reportedly has been kept as a working pet by local ranchers to destroy rodents. Patagonian weasel The Patagonian weasel ("Lyncodon patagonicus") is a small mustelid that is the only member of the genus "Lyncodon". Its geographic range is the Pampas of western Argentina and sections of Chile. An early mention of the animal is in the Journal of Syms Covington, who sailed with Charles Darwin on his epic voyage aboard "HMS Beagle". The Patagonian weasel has a head and body length of , with
Patagonian toothfish sea bass" before settling on "Chilean sea bass". In 1994, the U.S. Food and Drug Administration (FDA) accepted "Chilean Seabass" as an "alternative market name" for Patagonian toothfish, and in 2013 for Antarctic toothfish. In the UK, the approved commercial designations for "D. eleginoides" and "D. mawsoni" are "icefish" and "toothfish". This has created some confusion as there is a genuine "icefish" ("Champsocephalus gunnari") caught in subantarctic waters, which does not resemble toothfish in any way. Patagonian toothfish spawn in deep water (around 1,000m) during the austral winter, producing pelagic eggs and larvae. Larvae switch to a demersal habitat at