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Fish measurement is the measuring of individual fish and various parts of fish anatomy, for data used in many areas of ichthyology, including taxonomy and fishery biology.
Total length ( TL) is the length of a fish measured from the tip of the snout to the tip of the longer lobe of the caudal fin, usually measured with the lobes compressed along the midline. It is a straight-line measure, not measured over the curve of the body.
Standard length measurements are used with Teleostei (most Actinopterygii), while total length measurements are used with Myxini (hagfish), Petromyzontiformes () and usually Elasmobranchii ( and batoidea), as well as some other fishes.
Total length measurements are used in slot limit and minimum landing size regulations.
Fishery biologists often use a third measure in fishes with forked tails, called fork length ( FL), the length of a fish measured from the tip of the snout to the end of the middle caudal fin rays, and is used in fishes in which it is difficult to tell where the vertebral column ends.
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