Lobster vs Crawfish

Lobsters and crawfish are close cousins, both in the infraorder of clawed crustaceans, and they look like scaled versions of each other. The simplest difference is where they live: lobsters live in the ocean, and crawfish live in streams, swamps and ditches. Size follows, with lobsters many times bigger.

Names add confusion. Crawfish is also called crayfish or crawdad, depending on region, and Louisiana is the country's biggest producer. A lobster can live a very long time, while crawfish are short-lived by comparison. When cooking either, you are looking for opaque flesh, not a time on the clock.

Lobster vs Crawfish side by side

Last verified October 2026. Typical values; individual animals, products and local prices vary.

When you are looking at which

Lobster (American)

• The animal came from salt water, and a trap or boat catch is involved.
• It is longer than a foot, with one noticeably huge pair of claws.
• It is a single animal, sold or served whole and priced each or by the pound.
• It has two claws that are far larger than any of its other legs.

Crawfish (crayfish)

• It came from a bayou, stream, swamp or ditch, in fresh water.
• It is about the length of your finger, 3 to 6 inches.
• It is cooked in large numbers together, as in a Louisiana boil.
• The claws are small and the tail is the main part you eat.

How this works

This page compares American lobster and common crawfish on habitat, size, claws, lifespan and names, using federal fisheries material and reference entries. The quiz asks five questions that you can answer from the animal itself or from how it is sold.

Species vary: a few crawfish are far larger than a typical one, and some lobsters are small. Spiny lobsters have no big claws and are a different group. Use size and water together, and do not rely on size alone.

Where these numbers come from

The figures and defaults on this page are based on:

• NOAA Fisheries: American lobster, Lobster claws, size, lifespan, molting, habitat and taste (checked October 2026)
• Britannica: Crayfish, Crayfish size, freshwater habitat, pincers and relation to lobsters (checked October 2026)
• Wikipedia: Crayfish, Regional names, Louisiana production and freshwater range (checked October 2026)
• FoodSafety.gov: Safe minimum internal temperatures, Lobster and shellfish doneness cues (checked October 2026)

Identification and kitchen guide. Species and regional names vary.