Miscalculate it's medicine. I used 10 times too much and it worked a treat. It did one loop de loop and it was all over.
Over feed it.
Why poison? You could just give it to the cat!
You could batter it before you fry it. I tried a wild one that I caught that was about a foot long. Pretty tasteless, use lots of lemon and herbs. Watch out for the fine bones.
I hope that helps.
Cheers
Chris