Dendrobranchiata are commercially fished and are used for cooking. The difference between prawns and shrimp is usually that prawns are larger than shrimps. Prawns are crustaceans similar in appearance to shrimps, but they can be distinguished by the gill structure which branches out in prawns but not in shrimps. Prawns are also related to crabs and lobsters. Prawns have two pairs of antennae.