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Fish measurement is the measuring of individual fish and various parts of their anatomies, for data used in many areas of ichthyology, including
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 bony fish), while total length measurements are used with Myxini (
File:Black Drum Length vs. Age.png,
File:Red Snapper Length vs Age.png,
Diagram of fish measurements
- Florida Museum of Natural History Ichthyology Department {{DEFAULTSORT:Fish Measurement Ichthyology Fishkeeping Fish anatomy Fisheries science
taxonomy
image:Hierarchical clustering diagram.png, 280px, Generalized scheme of taxonomy
Taxonomy is a practice and science concerned with classification or categorization. Typically, there are two parts to it: the development of an underlying scheme o ...
and fishery biology.
Overall length
Standard length (SL) is the length of a fish measured from the tip of the snout to the posterior end of the last vertebra or to the posterior end of the midlateral portion of the hypural plate. This measurement excludes the length of the caudal (tail) fin.
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 bony fish), while total length measurements are used with Myxini (hagfish
Hagfish, of the Class (biology), class Myxini (also known as Hyperotreti) and Order (biology), order Myxiniformes , are eel-shaped Agnatha, jawless fish (occasionally called slime eels). Hagfish are the only known living Animal, animals that h ...
), Petromyzontiformes ( lampreys) and usually Elasmobranchii (shark
Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the ...
s and rays), 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.
Fin lengths and eye diameter
Other possible measurements include the lengths of various fins, the lengths of fin bases and the diameter of the eye.
See also
* Ichthyology terms * Standard weight in fishReferences
External links
Diagram of fish measurements
- Florida Museum of Natural History Ichthyology Department {{DEFAULTSORT:Fish Measurement Ichthyology Fishkeeping Fish anatomy Fisheries science