I did it with a zander, much 'arder than a pike...
I have already trained a zander, how do you think i got the fish to photograph to train the pike??. Doh !
I had some Perch that would take worms out of your hand. They were kept in a tank with a Large Axolotl and they used to play shaking tug o war with the worms until they broke. They were proper 'ard.