Patagonian toothfish are large, slender fish with a broad head. The body is brownish-grey and covered in large smooth scales. They have large, fan-like pectoral fins. Patagonian Toothfish can gro to approximately two metres in length and weigh up to 200kgs. They are thought to live for up to 50 years and reach maturity from between 8-10.
Patagonian toothfish are a deepwater species that inhabits waters on seamounts and continental shelves. They are found at depths of 50‑3000 metres, with adults commonly being found at depths of 750-1000 metres.