Coon-striped shrimp, aka dock shrimp are common to WA waters. Prawns ARE shrimp if you talk to a scientist. Prawns DO tend to be bigger than shrimp. Calling shrimp prawns is the same as calling rockfish rockcod or sea bass. They're all the same, just different marketing strategies. However, if you eat at a restaurant, there IS a definite difference between shrimp and prawns.