Utah certainly is one of the strictest states I have seen in their regulations for what can be stocked and how to source those fish. It's a shame Utah doesn't have Kokanee on their approved list. The state stocks them in several of their public fishing lakes. The reason I would want them in my pond si they taste great. They may be more delicate than trout, but I like the way they taste.
I am still trying to understand why you would want to stock Utah chubs? Particularly when even the Utah DWS states they compete with game fish for food and space and can reach 16" in size, far larger than all but a world record rainbow trout or splake could eat. Trout, particularly rainbow trout can do quite well in the absence of any forage fish. They feed on aquatic insects and their many different larval forms along with other invertebrates found in a pond or lake.
http://wildlife.utah.gov/fishing/fish_ponds.php Your family should be able to find out most information they need from this link. Lot's of great information related directly to Utah there. Each state is very unique in their laws and regulations. We must remember that...