IMO Freshwater drum (sheepshead) is great as table fare. Sounds like stocking them is a win win!
Problem with that is, mussels are a filter feeder. They are loaded with whatever contaminants are in their environment. Fish that feed on them magnifies that contamination thousands of times over. That's one of the reasons round gobies entering the picture here locally is a big concern. Before them, the contaminants stayed in the mussels, not the bass, perch, walleyes, etc. The gobies eat primarily mussels, get loaded with bad stuff... Then get eaten by our gamefish. Bad combo.
