[header] How to cook or grill a whole fish [title] Scale your fish. [step] Set the fish on a flat surface, like a clean countertop. Press the flat side of the knife against the fish, with the knife bent at a 45 degree angle. 
Pointing the flat end of the knife against the grain of the scales, scrape the knife over the fish's body in long, even strokes until all the scales are removed. Flip the fish over and repeat on the other side.