I've tried all kinds of knifes to do the job and just about every one has needed to be re-sharpened in the middle of the job with the exception of a brand new knife. They always work great. I usually use filet knives and they work quite well. The latest greatest is a folding filet knife I picked up at Meijer for $15. That this is real nice for cheap. Comes with a sharpener that works well too.

Tom