Fresh raw prawns arranged on ice at a seafood counter

Prawns vs Shrimp: Are They Actually the Same Thing?

October 28, 2026

The short answer

Prawns and shrimp are not the same animal, biologically — but in everyday kitchen and market use, the words are used interchangeably and the distinction rarely matters for cooking. The naming is a genuine mess caused by the fact that the same words mean different things in different countries. Understanding the real difference is useful, but you do not need it to shop or cook well.

The biological difference

Prawns and shrimp are both decapod crustaceans (ten-legged), but they belong to different sub-orders with a few consistent anatomical differences.

Body segments: in shrimp, the second abdominal segment overlaps both the first and third segments. In prawns, each segment overlaps only the one behind it, giving a straighter body.
Legs and claws: prawns have claws on three pairs of legs, with the front pair often larger. Shrimp have claws on two pairs. Prawns also tend to have longer legs.
Gills: the two groups have different gill structures, which is the formal scientific basis for the distinction.
Habitat tendency: prawns are more often found in fresh or brackish water, shrimp more often in saltwater, though there are many exceptions.

In practice, prawns tend to be larger, but size is not a reliable distinguisher — there are large shrimp and small prawns.

Why the naming is so confusing

The confusion is regional. In British, Australian, and Singapore English, prawn is the default word for almost all of these crustaceans, large or small. In American English, shrimp is the default word, and prawn is often reserved for larger specimens or freshwater species. So the same animal on a plate might be called a prawn in Singapore and a shrimp in the United States.

This is why the words are functionally interchangeable in most conversations. When a Singapore hawker stall, supermarket, or recipe says prawn, it is using the standard local term, not making a biological claim. The label is about language, not species.

Does it matter when cooking?

For cooking purposes, the prawn-versus-shrimp distinction is far less important than size, freshness, and whether the shell is on. What actually affects your cooking:

Size: larger specimens take longer to cook and are better for grilling and feature dishes; smaller ones cook in seconds and suit stir-fries, fried rice, and pasta.
Shell-on versus peeled: shell-on protects the flesh, adds flavour, and makes better stock from the heads and shells; peeled is more convenient. Cooking shell-on then peeling at the table retains more flavour and moisture.
Freshness: far more important than the species name. Fresh prawns smell of clean sea; old ones smell of ammonia.

Buying and cooking well, regardless of the name

Whatever the label says, the same principles apply. Look for firm, translucent flesh and shells that are intact and tightly attached. Avoid any specimen with black spots spreading on the shell (a sign of age, though a little is harmless), a slippery texture, or any ammonia smell. Do not overcook — prawns and shrimp both cook in two to four minutes and turn rubbery the moment they are overdone. They are ready when the flesh turns from translucent to opaque and the body curls into a loose C. A tight O shape means overcooked.

Frequently asked questions

Are prawns bigger than shrimp?

On average, prawns tend to be larger, but it is not a reliable rule. Size depends on species and age, not on whether the animal is technically a prawn or a shrimp. There are large shrimp and small prawns.

Is one healthier than the other?

Nutritionally they are essentially the same — both are low in fat, high in protein, and a good source of selenium and vitamin B12. Neither has a meaningful health advantage over the other.

Why does Singapore say prawn and America say shrimp?

It is a difference in regional English. British-influenced English (used in Singapore, the UK, and Australia) defaults to prawn; American English defaults to shrimp. The same animal gets different names depending on where you are.

Can I substitute one for the other in a recipe?

Yes, freely. Match the size called for in the recipe rather than worrying about the name. A recipe calling for large prawns works perfectly with large shrimp and vice versa.

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