a fillet board for filleting fish having spines or horns on their pectoral fins extending outwardly from the sides of the fish body . the board defines apertures each sized to receive the horn of a fish laid flat on one side with the horn secured by the board . a plurality of apertures are sized and spaced along a portion of the length of the board to accommodate fish of different sizes . the fillet board has a spacer element to elevate the board above a supporting surface to provide clearance for fish horns to extend below the board . the fillet board includes a tail clamp for securing the tail of a fish .