Crayfish vs Crawfish: What's the Difference?

Crayfish vs crawfish is a question of dialect, not biology: crayfish, crawfish, crawdads and mudbugs are all the same freshwater crustaceans, and the word you use depends on where you grew up. Louisiana and the rest of the South say crawfish, the Northeast and Great Lakes say crayfish, and the Plains and the West say crawdad.

For a diner the practical answer is short. At a boil, on a sack or on a Cajun menu the word is “crawfish,” and whichever name your seafood counter prints, you are buying the same animal.

Crayfish vs crawfish vs crawdad at a glance

	Crayfish	Crawfish	Crawdad
Who says it	Northeast, Great Lakes, scientists worldwide	Louisiana, the Gulf Coast, Florida, the South, menus everywhere	Plains, Midwest, Mountain West, West Coast
Share of US survey respondents	32.5%	38.8%	19.5%
Where you see it in print	Field guides, biology papers	Menus, markets, boil invitations	Creek-fishing stories, bait shops

The percentages come from question 66 of the Harvard Dialect Survey, answered by 10,684 people. “Mudbug” scored 0.1 percent as a first-choice word; it survives as a Louisiana nickname, and the University of Kentucky lists it with “crawdaddies” among the animal’s other names.

The animal behind all three names

	Crawfish, crayfish or crawdad
Taxonomy	Order Decapoda, superfamily Astacoidea; North American species mostly in family Cambaridae
Where it lives	Fresh water: swamps, ponds, ditches, rice fields; Louisiana’s crop comes from flooded ponds and the Atchafalaya Basin
Size	Red swamp adults 2.2–4.7 in; market size starts near 3 in, 10–35 per pound
Flavor	Sweet, mild tail meat; the orange head “fat” adds a rich, savory note
Texture	Tender and springy, closer to shrimp than to lobster
Price	Varies weekly; Louisiana prices drop 40–55% for several weeks at peak season
Best cooking methods	Seasoned boil, étouffée, bisque, crawfish pies
Nutrition (100 g, farmed, cooked)	87 kcal, 17.5 g protein, 1.3 g fat, 137 mg cholesterol, 97 mg sodium

Are crayfish and crawfish the same thing?

Yes. The University of Kentucky’s entomology department places crayfish in the order Decapoda alongside lobsters, crabs and shrimp, and names “mudbugs, crawfish, crawdaddies, or crawdads” as alternate names for the same animals. The roughly 530 species worldwide fall into three families; Cambaridae, with more than 400 species, holds two-thirds of them and nearly all of the North American ones.

The LSU AgCenter’s crawfish production manual spells the split out: scientists in other parts of the world use the term “crayfish,” while the manual says “crawfish” because that is what Louisiana producers, marketers and consumers say. Same genus, same species, different spelling.

Where do people say crawfish, crayfish or crawdad?

The Harvard Dialect Survey asked Americans what they call “the miniature lobster that one finds in lakes and streams.” Crawfish won with 38.8 percent, crayfish took 32.5 percent and crawdad 19.5 percent. The survey’s map shows crawfish densest across the South, the Gulf Coast and Florida, crayfish concentrated in the Northeast and the Great Lakes states, and crawdad spread through the central Plains, the Midwest and the West.

Louisiana usage sets the menu word nationwide because Louisiana supplies the crawfish. The state’s Department of Wildlife and Fisheries counts more than 1,300 farmers and 1,000 fishermen producing 100 to 120 million pounds a year, and the LSU AgCenter estimates Louisiana accounts for 90 to 95 percent of US production.

What are crawdads?

Crawdads are the same animals; the word marks a speaker from the Plains, the Ozarks or the West. If a Midwestern friend caught crawdads in a creek as a kid, they caught wild crayfish, most likely a Cambaridae species of 2 to 4 inches. The University of Kentucky notes the largest local species reaches 6 inches, but most adults are far smaller than the farmed crawfish on a boil table.

Which crawfish species do we actually eat?

Two. The LSU AgCenter says Louisiana’s harvests, farmed or wild, consist of the red swamp crawfish (Procambarus clarkii) and, to a lesser extent, the white river crawfish (Procambarus zonangulus). Red swamp adults run 2.2 to 4.7 inches, according to the USGS, which also notes the species is sold as “freshwater lobster” in the aquarium trade.

Louisiana Sea Grant gives the easiest field mark: a blue-gray line on the underside of a red swamp crawfish’s tail. White river crawfish lack it, have longer and rounder claws, and show no red pigment as adults. Both land in the same sack, and most eaters never notice.

When is crawfish season?

Farm ponds flood in October, harvest begins in November or December once catches justify running traps, trapping peaks in March and April, and ponds drain in May or June, per the LSU AgCenter’s production calendar. Mississippi State Extension says about two-thirds of the crop lands between March and June. Wild crawfish from the Atchafalaya Basin typically run February to May, depending on water levels.

Buyers talk in counts. The LSU AgCenter says consumers typically prefer 23 or fewer crawfish per pound (3 1/2 inches and longer), and 10- to 15-count “selects” command premium prices. Minimum marketable size is about 3 inches, or 35 to the pound.

What do crawfish taste like?

Sweet and mild, with shrimp-like texture and a lobster-like flavor. The tail is the sweet part; the yellow-orange head “fat” (the hepatopancreas) is what the LSU AgCenter calls “an important flavoring condiment in Louisiana cuisine,” savored for its rich flavor. Expect about 15 percent of live weight as tail meat, so a 3-pound boil serving yields a bit under half a pound of meat. Our crawfish taste guide goes deeper, and the crawfish vs lobster and crawfish vs shrimp comparisons rank the three side by side.

Is crawfish healthy?

Yes. USDA FoodData Central lists 100 grams of farmed, cooked crawfish at 87 calories, 17.5 grams of protein and 1.3 grams of fat, with 137 mg of cholesterol and only 97 mg of sodium before seasoning. The same serving supplies 34 micrograms of selenium, 0.58 mg of copper and 3.1 micrograms of vitamin B-12, plus about 160 mg of EPA and DHA omega-3s. Boil spice and butter, not the crawfish, add the sodium and fat.

Can you get a crawfish boil in Orlando?

Yes, in season. Red swamp crawfish are native from the Florida panhandle west to Mexico and now live throughout peninsular Florida, per the USGS, but there is no Florida harvest to speak of. Orlando boil houses buy Louisiana sacks, which the LSU AgCenter says sell live mostly within a day’s drive of south Louisiana, so Central Florida pays freight on top of Lafayette prices. Expect the best supply from February through May, and read our seafood boil guide before you order by the pound. Outside the season, Fish On Fire’s menu covers the same craving with Gulf peel-and-eat shrimp.

Which should you order?

• A boil: whole live crawfish, ideally 15- to 20-count, bought by the pound with corn, potatoes and sausage.
• Étouffée, bisque or crawfish pie: peeled tail meat, sold cooked in 12-ounce or 1-pound packs; Louisiana-packed tails keep the fat.
• Somewhere that says crayfish or crawdad: order with confidence. The animal, the season and the cooking are identical.

Bottom line

Crayfish, crawfish and crawdad are three regional names for one freshwater decapod, and the two species that matter at the table are both Louisiana Procambarus. Use “crawfish” when you order, buy from February to May, and judge the plate by the count and the seasoning rather than the spelling.