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My experience has been that small (#8 - #4) circle hooks don't work well for catch and release.The hook gap isn't wide enough to readily catch in corner of the fishes jaw and if swallowed or hooked deep in the mouth a circle hook is a nightmare to get out. Use light wire, bronze hooks , flatten the barb and be ready to cut the line if the fish has swallowed it.I understand that treble hooks are illegal with live bait?? Dick
How many trout get deep hooked when your fishing with bait and traps? Should I use circle hooks if I want to release most of the fish? I've only caught one brook trout (in a spot that shouldn't have trout) on a minnow/trap and it swallowed the bait, so we kept it. Do most trout, swallow the bait?
Red Gamakatsu #10 octopus for trout.
Circle hooks limit catch and release mortality according to several studies, probably because of fishing with an active line and a fishing rod (less chance of deep ingestion of bait). Using a circle hook on a static line on a tip-up, with the associated delayed hook set, will likely not result in less gut hooked fish.http://www.wildnh.com/Fishing/Fishing_PDFs/Circle_Hooks_brochure.pdf