One of the problems with using circle hooks for pike is that for the circle hook to work effectively and actually take hold, you don't strike - the hooks are designed to turn and enter the flesh of a fishes mouth as they are pulled from the mouth - they were initially designed for commercial use in long set lines at sea, where a single line might hold several thousand baited hooks, left unattended. Fish takes the bait, swims off and hooks itself as the hook is pulled outwards.
Not sure at all whether that would work too wellwith pike and all their teeth, designed to clamp and hold before swallowing? (Though I have tried it)
The next issue you face is how to mount a relatively large bait on a circle hook (there are ways, most quite fiddly) that leaves the hook relatively exposed.
Then of course there is the hairy subject of traces - few would risk pike fishing without a wire trace (though I realise that heavy fluorocarbon is used by many anglers, particularly outside of the UK, and when fishing for sea predators), but not using one in deference to the catfish would almost certainly produces bite-offs from pike.
I've used them with livebaits for pike (with a wire trace), effectively hair-rigging the bait through the top lip and lobbing the bait rather than a hefty chuck at the horizon, not striking at bites but simply clamping down as a pike runs and letting the hook do its job.
Can't say I caught any more fish or less, and never deep hooked anything. Best benefit was that live baits stayed that way for hours unless taken ... and had several large bonus perch at times too, taking 4 / 5" livebaits complete with trace!
Edited by philocalist, 05 September 2017 - 11:29 PM.