You can try stocking bluegill, but I don't think they will survive in your pond's water chemistry... Bluegill are hardy and adaptable, but waters near coastal areas with lots of tannins aren't what BG are adapted to. Similar to the ponds near my dad's house I mentioned, my girlfriend's parent's live in a golf course community in southern NC right along the coast. There are some ponds in the neighborhood. Some support bluegill and the bluegill do fine. Some of the ponds, particularly the larger ones do not support bluegill. The only fish in them are largemouth bass, golden shiners, pumpkinseed sunfish and spotted sunfish. Again, its that dark black tannin stained water. However, with just that fish community the largemouth do great and get to a nice size with good relative weights.