A good pair of needle nose pliers, a small pair of Xuron Brand sprue cutters and two chain saw files tightly wired together at both ends as a hook sharpener.
Sometimes if you have a fish hooked in a difficult spot you can use the Xuron Cutters to perform "minor surgery" by snipping a small section inside the fishes mouth to allow you to more easily get the hook loose.
And you do need a emergency kit somewhere in your boat with a bic lighter, fire starter material, aspirin, tobacco for stings, small flashlight, granola bars and some paper towels all this in a zip lock bag.