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Chilean Sea Bass

Chilean sea bass is the market name commonly used for the Patagonian toothfish, a deep-water fish from cold Southern Hemisphere waters.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

Chilean sea bass is the market name commonly used for the Patagonian toothfish, a deep-water fish from cold Southern Hemisphere waters. It is not a true bass; the name was adopted for marketing, and in the United States it is used as an alternative market name for Patagonian toothfish. The species is valued as a food fish but has also been associated with overfishing and illegal, unreported, and unregulated fishing.

Naming and classification

Chilean sea bass is a trade name for Patagonian toothfish. Sources note that it is not a true bass and belongs to the family Nototheniidae.

Habitat and biology

The species lives in cold, deep waters of the Southern Hemisphere, including around Antarctica and the southern oceans. It is described as a slow-growing fish adapted to deep-water conditions.

Culinary use

Chilean sea bass is prized as a food fish for its mild flavor and rich texture. Its commercial popularity rose sharply in the late 20th century.

Conservation issues

Commercial demand led to heavy fishing pressure, and sources describe significant concerns about overfishing and poaching. Management has been complicated by illegal and unreported catches.

Key facts

  • The fish sold as Chilean sea bass is generally the Patagonian toothfish, not a bass.
  • The name was created as a more marketable label for consumers.
  • It lives in cold, deep ocean waters in the Southern Hemisphere.
  • The species is a slow-growing deep-water fish.
  • Sustainability has been a major issue because of overfishing and illegal fishing.
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Canadian context

In Canada, Chilean sea bass is sold in seafood markets and restaurants and may be labelled under its market name or as Patagonian toothfish. Canadian readers may also encounter sustainability advisories because the species has been linked to illegal and overfished stocks.

Frequently asked questions

Is Chilean sea bass actually a bass?
No. It is the market name for the Patagonian toothfish, not a true bass.
What is its scientific name?
The main species sold as Chilean sea bass is Dissostichus eleginoides.
Where does it live?
It lives in cold, deep waters of the Southern Hemisphere, including areas near Antarctica and the southern oceans.
Why is it called Chilean sea bass?
The name was adopted as a more attractive marketing term for consumers.
Is it sustainable?
The fish has been associated with overfishing and poaching, so sustainability depends on source and fishery management.

References

  1. Greenpeace — https://www.greenpeace.org/static/planet4-usa-stateless/2024/11/ff9054c8-chilean-sea-bass-factsheet.pdf
    Supports: Common name, deep-water habitat, marketing history, and sustainability concerns.
  2. Vital Choice — https://www.vitalchoice.com/articles/food-facts/chilean-sea-bass-vs-sea-bass
    Supports: Scientific name, habitat, and clarification that it is not a true bass.
  3. Wikipedia — https://en.wikipedia.org/wiki/Patagonian_toothfish
    Supports: Scientific classification, distribution, and use of the name Chilean sea bass in North America.
  4. Science of Cooking — https://www.scienceofcooking.com/food-encyclopedia/chilean_sea_bass.htm
    Supports: Trade name usage, habitat, and commercial fishery context.
  5. Vital Choice — https://www.vitalchoice.com/articles/food-facts/chilean-seabass-facts
    Supports: Deep-water habitat, not a true bass, and sustainability concerns.
  6. The Daily Meal — https://www.thedailymeal.com/what-is-chilean-sea-bass/5714/
    Supports: Marketing origin of the name and general culinary description.