Now you are opening up a can of worms with bycatch. Although nice in concept, do you have any idea what a nightmare for enforcement it would be if bycatch is allowed to be landed? Or what a process to set up and pay for a system would be? If you think there are few tuna now, wait until everyone starts landing them. By-catch is a necessary evil in commercial fishing. Ask any Maine lobsterman what he thinks about allowing trawlers to land lobsters as "bycatch".