I believe ghost shrimp and grass shrimp are the same animal- Palaemonetes Paludosus . At least, I believe the trade name for grass shrimp is ghost shrimp and they will breed in fresh water. Central and South Florida lakes and creeks are usually littered with them, especially in hydrilla beds as well as val flats. We used to seine them by the pound when I was growing up.
Amano shrimp, on the other hand, need brackish water to spawn.