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common name for a genus (Dissostichus) of deep-water marine ray-finned fishes found in waters off S South America to Antarctica. The Patagonian toothfish, D. eleginoides, is the northerly of the two species; the Antarctic toothfish, D. mawsoni, is found only in circumpolar waters. The fish have thick scales, large eyes on the top of the head, and sharp teeth. The firm, bright white meat has made the fish a popular food fish since the 1990s; in the United States it is usually known as Chilean sea bass, but it is not related to the bassbass
, in musical harmony, the part of lowest pitch. The term is used for the lowest-pitched male voice and for instruments of low pitch, such as bass clarinet, bass drum, bassoon (bass oboe), and bass trombone.
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. The toothfish can take 10 years to reach sexual maturity, grow to weigh up to 200 lbs (90 kg), and live up to 50 years, but due to overfishing the average catch now measures about 2 ft (60 cm) long and weighs about 10 lbs (4.5 kg). Since 2000, however, increasing attempts have been made, with partial success, to regulate the catch.

Toothfish are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Actinopterygii, order Perciformes, family Nototheniidae.

References in periodicals archive ?
The TAC for the Heard and McDonald Islands (HIMI) Fishery season for Patagonian toothfish will be 3 525 tonnes, which is an increase of 120 tonnes, and the TAC for mackerel icefish will be 526 tonnes, which is a reduction of 35 tonnes.
He describes how South Korea had actually extracted the most toothfish in the area during the 2014-2015 fishing season (some 780 tonnes) but even it had assented to the Ross Sea MPA.
Director James Wallace said: "Our South Georgia Toothfish, which is MSC certified and WWF-listed, is a cod-like benthopelagic fish found in cold deep water at depths of up to 2,000m.
For example, in 2000, the Commission for the Conservation of Antarctic Marine Living Resources (60) (CCAMLR) introduced a "Catch Documentation Scheme" (CDS) for all toothfish species (Dissostichus spp.
All genetic diversity estimates were within the ranges published in previous works on Patagonian toothfish from geographic areas other than the Chilean coast, where observed heterozygosities ranged from 0.
Greenpeace, said: "This is a victory for the whales, toothfish and penguins that live in the Ross Sea, as well as for the millions of people who supported this effort.
There are also a special research zone and a krill research zone which permit limited fishing of toothfish and krill for research purposes.
Image Credit: Berger's winning dish of Patagonian toothfish with cured goose.
Highlights on the dinner menu include the tuna ceviche and the Patagonian toothfish with white fennel.
And the Patagonian toothfish found an unlikely champion in Prince Charles.
In Antarctica's cold, where fish have natural antifreeze in their blood, McClintock accompanied other researchers as they angled for giant Antarctic toothfish by dropping a 450-meter-long line through a meter-wide hole drilled in the sea ice about five kilometers offshore.