4ked Horn, Flourocarbon is new and improved monofilament. It can be snelled. I never snell, so I have no experience trying to snell it. I always crimp my line. A little secret with the flourocarbon, I would usually use 150-200lb leaders on my tuna rigs, but I will use 100-150lb flourocarbon. It is much stronger and near about invisible under the water. But about the hooks. WOW, 10/0, that is impressive. I would use those live baiting for marlin with a 5lb tuna. I do not have a printer right here with me, but look up these hooks, owner SSW in-line circle hook in maybe 5/0 or 6/0. Like I have said I have never fished for these fish. Ok, the herring or smelt, they are somewhat narrow, but a little broad, maybe 1" thick. Do you want your bait just twirling or drifting in the current, or do u want it to swim? I take it from what you said, there is not a real need for the fish to look alive, correct me if I am wrong though. Also, tell me if you need the hook tip inside the bait. Are there a lot of things to get snagged on or a lot of grass to get caught in?
Those fish should have a cartilage or bone structure around their mouth. These hooks target that structure and wrap around it. I have yet to see one fail, when the person did not try to jerk the fish out of the water. If you let the fish take the bait, turn and start swimming off, the hook with set perfectly in the corner of the mouth. Plus you sorta get a barb or safety catch, even after you press the so called barb. The tip acts as a second barb. But I am thinking that a 10/0 hook in a 6" bait is a little big. I use 10/0 on maybe a 12" bait. I am going to think and try to figure out which baits we use that are similar to the smelts that I could rig to show you. Do you know what a mullet is? If so, how does that compare anatomically with the smelt?