Scuds are very popular with duck hunters and apparently are stocked as a way to attract ducks. There must be something about ponds in the plain states and MN that attract the Gammarus species. I did stock some in my pond but never saw them again. Probably need correct water quality, hardness, pH, and above all, plenty of cover for them to hide in.

If the pond owner wanted to get in business of selling them they are fairly easy to ship and I think there still would be a market for them as well.