How to Freeze Shrimps:
Water: Put the shrimp in a container and fill it with water. Freeze them with the container, and the shrimp stays fresh until thawed.
Air-tight Bag: you can pat dry the shrimps and put them on a baking tray. Put the tray in the freezer until the shrimps start to harden. Put them in an air-tight bag and freeze for as long as you like. Putting them in a tray at first prevents them from clumping with each other.
Freeze in Brine: storing raw shrimps in brine solution not only keeps them fresh. You can clean the shrimps and put them in an air-tight container leaving no space between them.