Measurement of fish is the determination of the size of individual fish, different parts of their anatomy and the relationship between body parts. It is used in the study of the exterior and fatness of fish. It is necessary for various purposes: determining the allowable mesh size of fishing gear, studying the growth of fish, establishing a fishing measure for catching fish of a given species, as well as for the recognition of individual subspecies and local forms.

Fish body length - measured from the beginning of the snout to the end of the scales.