The Canadian Encyclopedia — neutral, cited, updated
July 26, 2026Sources cited
Canadianwire.
Canada’s encyclopedia & explainer
HomeScience & NatureCrustaceanCrawfish
Science & Nature • Crustacean

Crawfish

Crawfish is a common name for several freshwater crustaceans, especially crayfish, and in some regions also for certain marine crustaceans such as spiny lobsters.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Crawfish is a common name for several freshwater crustaceans, especially crayfish, and in some regions also for certain marine crustaceans such as spiny lobsters. They are not fish; they are shellfish related to lobsters, crabs, and shrimp. In North American usage, especially in the Southern United States, the term often refers to edible freshwater crayfish.

Name and classification

Crawfish is a regional name for crayfish, which are small decapod crustaceans related to lobsters. Some dictionaries also note a saltwater meaning, especially spiny lobster, depending on the region.

Habitat and ecology

Most crawfish live in freshwater environments such as streams, rivers, lakes, swamps, and muddy or slow-moving waters. They are benthic animals that feed on a mixed diet of living and decomposing plant and animal matter.

As food

Crawfish are widely eaten, often boiled or steamed and served in seasonal boils or seafood dishes. Culinary use is especially associated with the Southern United States, particularly Louisiana.

Regional usage

The word crawfish is used differently by region and can overlap with crayfish or, in some places, spiny lobster. This makes it a common example of regional vocabulary variation in English. In Canada, crawfish is less common than crayfish in general usage, and some Canadian regional dictionaries note unrelated slang or regional meanings in Quebec.

Key facts

  • Crawfish is another name for crayfish in many English varieties.
  • Crawfish are crustaceans, not fish.
  • They live mainly in freshwater such as rivers, streams, lakes, swamps, and ditches.
  • Crawfish are commonly eaten boiled or steamed, especially in Louisiana and other parts of the Southern United States.
  • They feed on both plant and animal matter, including detritus.
🍁
Canadian context

In Canada, crawfish is less common than crayfish in general usage, and some Canadian regional dictionaries note unrelated slang or regional meanings in Quebec.[6]

Frequently asked questions

What is a crawfish?
A crawfish is a crustacean, usually another name for a crayfish; in some regions it can also refer to a spiny lobster.
Are crawfish and lobster the same?
No. Crawfish are generally smaller freshwater crustaceans, while lobsters are marine crustaceans, though both are related.
Where do crawfish live?
Crawfish usually live in freshwater habitats such as rivers, streams, lakes, swamps, ditches, and rice fields.
How do you eat crawfish?
They are commonly boiled or steamed, then the tail meat is eaten; they are also served in crawfish boils and other seafood dishes.
What do crawfish eat?
Crawfish eat both plants and animals, including living and decomposing material and detritus.
Is crawfish a fish?
No. Crawfish are crustaceans, not fish.

References

  1. Merriam-Websterhttps://www.merriam-webster.com/dictionary/crawfish
    Supports: Defines crawfish as crayfish sense 1 and also notes a spiny lobster sense.
  2. Vocabulary.comhttps://www.vocabulary.com/dictionary/crawfish
    Supports: Describes crawfish as a freshwater shellfish/crustacean resembling a small lobster and notes culinary usage.
  3. Cambridge Dictionaryhttps://dictionary.cambridge.org/us/dictionary/english/crawfish
    Supports: Defines crawfish as a small animal similar to a lobster that lives in rivers and streams and is eaten as food.
  4. Dictionary.comhttps://www.dictionary.com/browse/crawfish
    Supports: States crawfish is another name for crayfish and says crawfish are shellfish, not fish.
  5. The Spruce Eatshttps://www.thespruceeats.com/what-are-crawfish-4771895
    Supports: Explains crawfish as freshwater crustaceans, notes they are boiled or steamed, and mentions habitat and culinary popularity.
  6. Wiktionaryhttps://www.wiktionary.org/wiki/crawfish
    Supports: Shows regional senses including freshwater crayfish, marine crustaceans in some regions, and Quebec slang usage.
  7. Oxford Learner's Dictionarieshttps://www.oxfordlearnersdictionaries.com/us/definition/english/crayfish
    Supports: Defines crayfish as an animal like a small lobster that lives in rivers and lakes and can be eaten.
  8. Wikipediahttps://en.wikipedia.org/wiki/Crayfish
    Supports: Summarizes crayfish biology, habitat, and diet; useful for general ecological context.