Scale of fish is removed simply by scraping it in the opposite direction, ie from tail to the head. Using the fish scaler or knife always make the scales flying all around, on your face, hair, and everywhere around the kitchen sink, worst, leaving a fishy smell in the kitchen sink. To prevent this, simply fill up a basin of water, and scale the fish underwater, all the scale will be in the water. After scaling, simply pour the water over a sieve, and discard the scales in the sieve. Another way is use a big plastic bag, hold the fish 1 hand, and scaler in the other and do the scaling under cover of the plastic bag to prevent the scales from flying all around.