fillet knife.............

[SkunkBoat]

The high carbon wood handled dexters can be sharpened better but you really have to take care of them. I use the stainless with white handle. For Flatfish, the 9" with the straight narrow blade is best. For stripers I like a shorter curved blade, but it has to be really sharp. You can push a curved blade and cut the skin from the inside out without trying to cut scales.
Of course never use a good fillet knife to cut bait.