Your getting some bad advice in this thread...NEVER EVER release a fish into the wild. Not only is that illegal almost everywhere, that is a great way to spread exotic diseases/parasites into the local ecosystem. Especially since you have been feeding it feeder fish (they are common carriers of many ailments).
In California, it is illegal to remove any fish from the wild alive, so technically you broke the law by keeping that bass. I would be more careful about posting illegal activities on here, several forum members have gotten in trouble with the law for just that.