Same as any other seafood: A mixed-species group swimming together is called a shoal. A group of the same species swimming together in a synchronized manner is a school. So, the answer to your question is school. read more
Other decapod crustaceans also called shrimp, are the ghost or mud shrimp belonging to the infra-order Thalassinidea. In Australia they are called yabbies. The monophyly of the group is not certain; recent studies have suggested dividing the group into two infraorders, Gebiidea and Axiidea. read more