OP also suggests that "bucket fishermen" stop fishing after they've caught their limit. I think that's a stretch. Just because you catch your limit, doesn't mean you stop fishing. I've seen people catch their limit in the first 10 min of the day and then do C&R for another 2+ hrs. No way around it that person kills more fish in a day than someone who does solely C&R. So yes, in response to your original post, C&R fishermen kill less fish. Are they better people? No. But they do use less of the resource. On a side note did they use a control for this experiment? Meaning did they put the same number of fish not caught on a hook in line in the cage and check mortality rates on them?