If you feed the trout with pellets, you'd be fine adding them. Stock as many or as little trout as you want. I'd stock no more than around 100 if feeding. If you don't think you'll eat that many trout, then stock less. A consideration is if the trout will survive your summer temps. If they won't, spring usually isn't the best time to stock trout. Most stock them in the fall to enjoy them for a longer period of time.
All it takes are just a few males to do the job for your YP. At 30 adult YP, if you do have a least a few males, I think you will be good. Just make sure the YP have a good place to spawn in your pond.
