I don't know where it is in the reg book, but if you go to any of the lakes and spillways here, like Carters, Allatoona, Lanier, Ocoee and Blue Ridge, they have large signs up that say you cannot release carp, buffalo or gar back into the water once you've caught them. You must also release Grass Carp, and sturgeon, and must report the catch to a particular phone number or website listed on the sign. You must also report any sighting or catches of snake-heads, walking catfish, zebra mussels or Pacu. Failure to do so can result in up to a $500 fine and loss of fishing licence for 2 years. They have pictures of all of them posted for identification.
I don't know how much plainer they can be than that.
I keep forgetting that everyone doesn't understand how it is in Ga. Just because something isn't written down somewhere, doesn't mean they can't or won't take you to jail, fine you and confiscate your property. Law Enforcement, especially the DNR have VERY, VERY wide descretion on what they do, and the courts will back them up in this state. Half the time, you will never even get to go to court to fight it. Example: If you are observed with a loaded weapon within 50' of any dirt road, trsil or anything that could be interpreted as a road, even if you have a CCW, you will be charged with hunting from the road. You do not go to court. You either pay it, or lose your drivers, hunting and fishing licences and maybe have your equipment confiscated.
So in Ga., when they put a sign out telling you not to do something, whethter it is a law or not, we just don't do it, and don't question it much.
Semper Fi!