There is so many different types of ghost shrimp, im not exactly sure which species the ones commonly sold in aquariums is. I think the species in the trade may be Palaemonetes paludosus, but im not entirely sure. This species is native to USA, Im assuming that most ghost shrimp are actually native to the USA (because they grow in the wild here so it would be cheaper to raise and catch them here then import them) I've heard from people on here that they have caught ghost shrimp in Florida.