Floatable FIAP Fish Grader has been made from impregnated wood. The gap widths of FIAP Fish Grader‘s grid can most easily be adjusted. A lever mounted to the handle is thumb tripped. Pressing the lever up or down at respective notches will diagonally adjust FIAP Fish Grader like a rhomb. Accurate gap widths in between the grading slats is ensured. All metal parts mounted to FIAP Fish Grader are corrosion-resistant (aluminum and brass).