I've used a 6 wt. for Pinks often but seriously, if you plan to release them, you might consider a 7 or 8 wt. so you don't tire the fish out so much. I used a 7 wt. most of the last run and while my arms got a little tired, the fish at least had a chance for survival. It's one thing to catch and release but still another to release and kill. Remeber, the hook-up is what counts.