A fish scaler is a kitchen tool which is designed to remove the inedible outer scales from fish, leaving soft skin behind. These scales are usually removed as a part of the cleaning process, during which the fish will be gutted in preparation for cooking or freezing. There are a number of different kinds of fish scalers on the market, ranging from large motorized commercial versions designed for cleaning multiple fish at once to simple hand held models. The end goal is to quickly and painlessly remove the scales from a fish.

Some fishermen simply use the blade of a knife to remove scales. The knife is gently but firmly scraped along the body of the fish, pulling scales with it. However, people can injure themselves doing this, either on the blade of the knife, which must be extremely sharp, or on the sharp fins which some fish have. Therefore, some fishermen prefer to use a specialized tool for comfort.

The most basic fish scaler is a handheld version which looks rather like a rasp. A comfortable handle is firmly gripped while the fisherman drags the fish scaler down the body of the fish. This design is usually very efficient and easy to use, and a skilled handler can remove all the scales from a single fish very quickly. Since removing fish scales is a rather onerous task, this type of fish scaler makes the cleaning process much more enjoyable.

Some companies make small electric fish scalers which rotate or vibrate, almost like electric sanders. To use this type of fish scaler for removing scales, the fisherman lightly pulls it down the body of the fish, with the fish scaler cleanly pulling scales off. Typically the device is waterproofed and battery operated for convenience.

A commercial fish scaler, on the other hand, is designed differently. The fish are put inside a large tumbling drum with rough rides. As the drum turns, the sides of the drum pull the scales off, and after a set period of time, the scaled fish are removed. This type of fish scaler is not always practical, as some fish may be damaged by passing through the drum. Commercial fishers and people who catch a high volume of fish both use tumbling drums.

As a general rule, fish is scaled and cleaned before it reaches the market, so most consumers do not need a fish scaler. People who do their own fishing, however, will benefit from the purchase of a fish scaler, and although the tool is not intended for multipurpose use, it is certainly useful when it is needed.