I wouldn't chance it, most commercially prepared foods are freeze dried to keep most of the nutrients intact. The dried shrimp from china town are usually soaked in a brine or the like then sun dried leaving them open to parasites and whatnot.
I've fed them to my fish with no ill effects. Check the bags. If it says freeze-dried, they're OK straight from the bag. If it says just 'dried', soak the shrimp 1st in fresh water to leech out most of the salt. Then, feed them to your fish.
I wouldn't chance it, most commercially prepared foods are freeze dried to keep most of the nutrients intact. The dried shrimp from china town are usually soaked in a brine or the like then sun dried leaving them open to parasites and whatnot.