DonC, so 'bream' will be a general term for various types of bluegill-type fish. Most likely, it wouldn't hurt to add some more bluegill; if you've got existing bass, then you would benefit from stocking larger bluegill and you'd have to find out what Dunn's is going to have.
Stocking fatheads doesn't hurt, but they can get pretty quickly cleaned out by existing bass populations.
Those cormorants would have done a good bit of damage to your pond if they were able to stay there unmolested, but like it was said, they wouldn't have gotten every single fish. But you need more than just a 'few' bluegill in your pond.
