I agree of the premise that freshwater parasites cannot live in saltwater, however, there are always exceptions. And with our limited resources of animals I don't think that is a risk I would be willing to take. Also, I think that what jw said about the nutrition content and inherent risks and consequences is valid. Some people may boo-hoo this, but, if you want to see your animals hunt choose saltwater fishes. More costly...yes..but more in line with their natural environment. JMO. HTH.