The person that reels in the fish gets to take claim on it. If your worried about getting to lay claim on some fish them take turns reeling them in. That's the way I always do it. I never take first fish, guest always get first fish. I would hate to see you run a charter business, you would have a lot of unhappy clients when you tell them that you're keeping their fish of a lifetime because you "caught it" and want to get it mounted and need a skin mount.