FilletA slice of fish flesh of irregular size and shape which is removed from the carcass by a cut made parallel to the backbone, usually 2 to 12 oz. Some fillets, especially of fresh fish and those used to make up the larger frozen blocks, may be larger than 12 oz. However, for most institutional foodservice and home uses, frozen fish fillets over 12 oz. are not generally available. Special cut fillets are taken from solid large blocks; these include a "natural" cut fillet, wedge, rhombus or tail shape.