I’m not asking to do the assignment for me. I already finished it a long time on it. My conclusion is that they’re the same. I have found some sources. With any type of search engines you should find many sites about this. I just want to know what you guys think about shrimp and prawn. I mean it’s an international debate in biology. I’ll just write what my assignment says. Then can you make any conclusions please. Tell me what is right and what is wrong. Many people in the world are questioning about this….

What written in my assignment:
Crustaceans are Arthropods that have an ecoskeleton (like a permanent suit of armour). It’s not water tight however, which differentiates them from insects. Crustaceans also have gills and a special aquatic larval stage.
Dividing Crustaceans up gives us 6 classes. Basically, these groups cover:
* Copepods (planktonic swimmies)
* Ostrocods (small marine swimmies)
* Branchiopods (brine shrimp and Daphnia)
* Barnacles
* Branchiurans (parastic)
* Malacostracans (lobster, crabs, woodlice etc.)
It’s the Malaconstracans you’ve asked about, so they divide even further (a very diverse group!)
Here we have Isopods, Amphipods and Decapods. It’s the Decapods (meaning 10 legs) that contain all the lobsters, crabs, shrimp and prawns.
So, Mantis shrimp, king prawns, and snapping shrimp are all Decapods
(think of that classic “prawn” body plan – long slender body with lots of
legs and the head at the front with all the antennae). They’re all quite
closely related – at least with respect to their “order”. After “order”,
we divide organisms up into “family”, then “genus” and “species”.
Prawns and shrimp are very closely related – belonging to the same order (Decapoda). Both can occur in marine, estuarine and freshwater
environments, depending in the species in question.
What are prawns?
They are small ‘crustaceans’ (like crabs and lobsters) found in both marine and fresh water environments around the world. Two main groups of prawn are produced commercially: small ‘caridean’ prawns (from tropical and temperate waters) and larger ‘penaeid’ prawns (from tropical and subtropical waters).
What’s the difference between a prawn and a shrimp?
The distinction between prawns and shrimps can be confusing. In some countries the bigger penaeid species are referred to as ‘prawns’ and smaller carideans as ‘shrimp’. In other parts of the world (such as some areas of the USA), this differentiation is the other way around. As many people use the words shrimp and prawn interchangeably, EJF makes no distinction between the two.
A shrimp is a shrimp; a prawn is, well, a shrimp. The two words are used interchangeably in markets and restaurants everywhere. The textbooks may agree that a shrimp is a shrimp, but many people (and quite a few cookbooks) refer to this most popular of shellfish as a prawn.
Some people say the difference is size. In many parts of the country, small and medium shrimp are sold simply as shrimp, while large, extra-large, and jumbo shrimp are called prawns. Unfortunately, this “rule” doesn’t always hold. In some areas, all shrimp, small and large, are sold as shrimp, while in other regions, all you’ll find are prawns. The Food and Agriculture Organization of the United Nations has attempted to clear things up with definitions of its own.
According to the FAO, a shrimp is a saltwater crustacean and a prawn is a freshwater crustacean.
So according to me…. They’re basically the SAME.

The question:
What is wrong, what is right.
What is the difference between shrimp and prawn.