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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; the Antarctic toothfish is subject to greater illegal fishing by unregulated vessels.

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.

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References in periodicals archive ?
Allozyme and microsatellite DNA markers of toothfish population structure in the Southern Ocean.
What better guarantee of the future health of the toothfish stock could you ask for?
Sanford, one of two fishing companies in New Zealand licenced to catch toothfish in the Ross Sea, has welcomed the news of the navy tracking the movements of the three fishing vessels.
The Ross Sea is home to 6 percent of the world's Antarctic minke whales, perhaps 50 percent of Type C orcas, known as the "Ross Sea killer whale," which feed primarily on toothfish instead of seals or whales), and tens of thousands of Weddell seals, about half the population in the South Pacific sector of the Southern Ocean.
Oxygen and carbon stable isotopes in otoliths record spatial isolation of Patagonian toothfish (Dissostichus eleginoides).
It was pulled in from the Ross Sea, near Antarctica, and was chewing on a 30 kg toothfish when it was found.
The fishermen were catching Patagonian toothfish in Antarctic waters south of New Zealand when they got the unexpected bite.
More copies are available at] When in doubt, I whip it out, and I feel great about catfish and crawfish, Pacific oysters and Dungeness crab, domestically farmed tilapia and Manila clams, and I remember to steer clear of grouper and snapper, Chilean sea bass (its other aliases include Patagonian toothfish, Antarctic cod, and icefish), orange roughy (sounds like a synthetic rockfish and tilefish (sound like fabric), construction materials), Atlantic cod and halibut (sound like The Perfect Storm).
John Davis of the Australian Fisheries Management Authority said that the Australian Government is pursuing all legal avenues available to at least control toothfish pirating in the Heard Island and MacDonald Island fisheries.
The lists discourage consumers from purchasing bluefin tuna, cod, farm-raised (Atlantic) salmon, orange roughy, swordfish, toothfish (Chilean sea bass), wild caviar, King crab, and imported shrimp.
Activists have urged South American countries to work together on conservation and sustainable use goals for the fishery and trade in Patagonian toothfish, sold in the US as "Chilean sea bass."
5 PATAGONIAN TOOTHFISH: The toothfish, or Chilean sea bass, has suffered for its popularity with seafood lovers in the US and Japan.