I have heard of people eating goo, but I don't know how they were fixed. Possibly as a fish stew? Going by how they smell when you pull em up, I don't think I'll ever try one. They stink!
DB, they are also called black drum. Depending on the water they are taken from, they can be anywhere from dark silver to dark purple.

From the TPWD Pamphlet:
"Although freshwater drum is considered a rough fish by many anglers, it is prized as a food fish in some areas. Drum are also sought after as bait for other species. In Texas the rod and reel record exceeds 30 pounds, and the trotline record is 55 pounds."

Kirk