Electric fillet knives take most of the work out of cleaning fish at the end of the day. They’re designed like reciprocating saws, with two thin blades mounted side by side on the knife’s handle. When the knife is turned on, one blade pushes forward while the other blade pulls backward. This helps the knife cut through skin and flesh without much pressure applied to the blade, which lets you easily maintain control of the knife throughout the cleaning process. They're a good choice if you're planning to clean lots of fish.