No, prawns and shrimp are not the same animal; they are distinct biological species with different gill structures, claw arrangements, and reproductive habits, though the terms are often used interchangeably in cooking.
Walk down the seafood aisle and you’ll spot bags labeled “shrimp” and a few labeled “prawns.” Pick one for your pasta and wonder—are you choosing two different animals or just two names for the same thing? The short answer is that they are biologically distinct, but the longer answer involves anatomy, geography, and what your local supermarket actually stocks.
What Is the Biological Difference Between Prawns and Shrimp?
Both creatures are decapod crustaceans (ten-legged shelled animals), but they split into different suborders a long time ago. Shrimp belong to Pleocyemata, while prawns belong to Dendrobranchiata. This family-tree split shows up in three clear physical features:
- Gills: Shrimp have flat, plate-like gills (lamellar); prawns have branching gills that look like tiny ferns.
- Claws: Shrimp carry claws on two pairs of legs, with the front pincer being the biggest. Prawns carry claws on three pairs of legs, and the second pincer is larger than the front.
- Body shape: Shrimp have a pronounced curve in their body and can bend deeply. Prawns have a straighter body where each segment overlaps the next, which limits how much they can curl.
How Can You Tell Them Apart at the Store?
Unless you’re a biologist with a magnifying glass, you probably won’t inspect gills or count claw pairs on a tray of peeled tail meat. One practical clue is the tail segment structure. On a shrimp, the second tail segment overlaps the first and third. On a prawn, each segment overlaps the one behind it evenly. But honestly, most cooks rely on size and labeling.
The table below lays out the differences side by side for quick reference:
| Feature | Shrimp | Prawn |
|---|---|---|
| Scientific suborder | Pleocyemata | Dendrobranchiata |
| Gill structure | Plate-like (lamellar) | Branching |
| Claw pairs | Two pairs, front pair largest | Three pairs, second pair largest |
| Body curve | Strong curve, flexible | Straighter, less flexible |
| Eggs | Carried under tail | Released into water |
| Typical habitat | Mostly saltwater | Mostly freshwater |
| Typical size | Smaller to medium | Medium to large |
Why Do Menus and Markets Use the Words Differently?
This is where science meets shopping. The terms “shrimp” and “prawn” are common names, not scientific classifications, and their use varies wildly by region. In the United States, almost every species sold is called “shrimp,” regardless of its biological group. The word “prawn” rarely appears unless a fishmonger is selling a very large freshwater species or using it as a fancy-sounding size label.
Which Term Is Used in Different Parts of the World?
Regional naming flips the script depending on where you’re cooking:
- United States: “Shrimp” is the standard word for all sizes. “Prawn” is uncommon and usually means a larger shrimp.
- United Kingdom, Australia, New Zealand, Ireland: “Prawn” is the everyday term for both large and small swimming crustaceans. In Australia, locals rarely say “shrimp” for anything.
- Commercial fishing: The Food and Agriculture Organization (FAO) uses both terms interchangeably in its species catalogs.
Is There a Difference in Taste or Texture?
For practical cooking purposes, no. Prawns and shrimp taste nearly identical, with the same firm, mildly sweet meat. Some cooks swear that larger prawns taste slightly sweeter, but that’s a size effect, not a species difference. Nutritionally, both are excellent sources of lean protein (around 20 grams per 100 grams) and low in calories, with nearly identical vitamin and mineral profiles. You can swap one for the other in any recipe without changing the result.
Common Misconceptions About Prawns and Shrimp
A few myths keep circling kitchen conversations. Here’s the reality behind them:
| Misconception | Reality |
|---|---|
| “Prawn is just a marketing name for big shrimp.” | They are biologically different animals, though many “prawns” sold in the US are indeed large shrimp. |
| “All prawns are bigger than shrimp.” | True as a general rule, but size varies widely by species. Some shrimp species are larger than some prawns. |
| “Shrimp and prawn are scientific groups.” | They are common names, not taxonomic ranks. Crustacean taxonomist Tin-Yam Chan has confirmed this. |
What This Means for Your Cooking
When a US recipe calls for shrimp, buy what your market labels as shrimp—it’s what was intended. If the recipe says “prawns,” you’re looking for something large. Either way, cook them the same way: a quick sear in butter or oil, a few minutes per side until pink and firm, and they’re done. Overcooking turns both tough and rubbery, so watch the timer.
The One Safety Note That Matters
Both prawns and shrimp are crustaceans and contain the same allergenic proteins. If you or your guests have a shellfish allergy, both foods carry the same risk. No safe swap exists between the two for allergy sufferers.
References & Sources
- Food Network. “Prawns vs Shrimp: What’s the Difference?” Covers the biological and culinary differences between the two.
