1. Shrimp as food:
A number of the larger species are caught commercially and used for food. All different cultures have reciepes for shrimp: examples include jambalaya, okonomiyaki, poon choi, bagoong, Kerala and scampi. Preparing shrimp for consumption usually involves removing the shell, tail, and "sand vein" (a euphemism for digestive tract). Removing the "vein" can be referred to as "de-veining". Yet, shrimp do not have any veins; they have an open circulatory system. To remove the "vein" make a shallow cut lengthwise down the outer curve of the shrimp's body. Pick out the dark ribbon-like vein running lengthwise along the shrimp's back with a pointed utensil. Then rinse the shrimp under cold running water. If the tail has been detached, the vein can be pinched at the tail end and pulled out completely with the fingers.
2. Shrimp as bait:
Shrimp are a popular choice of bait for most fishermen. They can catch fish such as snook, redfish, sea trout, and many other varieties of fish.
3. Shrimp as cleaners:
Some species of shrimp are commercially sold for the fact that they clean bacteria and decay inside fish tanks. Shrimp also maintain symbiotic relationships in the wild with other organism that shrimp will clean in exchange for protection.