I have a few fishing buddies that I can hear saying: "I didn't need a study to tell me circle hooks catch fewer fish." I have met plenty of guys that straight-up scorn the things. As for me, I believe there is a time and a place for circle hooks, it's just not every time and every place. In terms of their effectiveness offshore, they are terrific for chunking tuna that will grab a bait and take off. On the trolling front, I once fished a local billfish tourney where not one of the 7 white marlin raised managed to get the hook. I've used circle hooks for everything from stripers to catfish to sharks, and in my opinion, they need a little time to set. So when they're being pulled behind a boat at 8 knots and a fish comes screaming in, a lot of things have to go right for that hook to work properly. It's just not the kind of fishing they were desinged for.