If fishing is slow, why complain about the fight that fish has given you. Unless you plan on keeping that carp you gaff, then it wouldn't be a good idea. I don't believe in just killing a fish just because it happens to be the wrong kind, ugly, or some think it's useless, not to mention if you buy a commercial gaff, odds are it's not gonna be as good as you would like. Having made many a gaff while working on sportfishing boats in S.Cal, those gaffs are crap, the hook is normally too big, and depending on your state fishing regulations, IE, Cal, it's illegal to gaff ANY freshwater fish. Get a net and release your opponent safely and be thankful for the fight it gave you. It maybe annoying when you hook them, but it's still fun to pull on something that pulls so hard without giving up.