All these replies only confirms my thoughts about whether or not fish feel pain.In short my answer would be "NO" If a fish feels pain when it has just been stabbed in the mouth with a fish hook............why would it want to continue feeding ? Can't be in that much pain that it overides it's hunger.
Had a similar experience on Seaham S pier years ago. Got a bite, hooked the fish, but it got snagged up on the way in. Got my sinker back, but the hook length and fish had broke free. Next cast...........another bite, hooked the fish and this time landed it (a codling about 2 lbs) went to get the hook out, and my previous hook length was still in it's gob with the worms still wriggling. It was definitely my previous hook trace. That fish had been hooked and dragged about 20 yds in, then was snapped off, but still was not in that much distress that it did,t want to continue feeding.
Might start a debate here, but does anyone else have any views as to whether or not fish feel paain ?
Having stated my view I still kill a fish as quickly as possible if I'm going to keep it.