Glad you asked...
Shocking fish can be done by dipping a live wire into the water from the side of the boat. You should never do this type of fishing in a metal boat unless you want to be shocked as well. Website with instructions to fish shocking: http://www.ehow.com/how_2312278_make-fis...
Then again, this answer might help you...
You can easily shock a fish by abruptly changing his environment. For example, putting a fish in direct sunlight or by cold air vents will shock him. If you put a fish in water that is too cold, it will also shock him.

