Traits-3AStandardLength
type: Ontology
creation date: 2026-08-21T21:20:54+02:00
imports: http://semantic-mediawiki.org/swivt/1.0

Traits:StandardLength
type: Subject
type: Category-3AMarine species traits
type: Category-3AMstconcepts
wiki namespace: 200
wiki page content language: en
collection: Traits-3ABiological Descriptors
concept type: Property
definition: 1) The measurement from the most anterior tip of the body to the midlateral posterior edge of the hypural plate (in fish with a hypural plate) or to the posterior end of the vertebral column (in fish lacking hypural plates). It may be restricted to the tip of the snout if the lower jaw projects. The base of the caudal fin (end of the vertebral column or posterior edge of the hypural plate) is determined by flexing the tail up while the caudal peduncle is held down. The resultant wrinkle or caudal flexure indicates the caudal base. It may also be determined by probing or dissection. Sometimes the posteriormost point is the last scale, the last pored scale or the beginning of the caudal fin rays. It is the usual scientific measurement for length of a fish except in Myxini, Petromyzontiformes, Elasmobranchii and Holocephali. This measurement is used because long-preserved fish often lose the tips of the caudal fin rays through breakage after the desiccation effect of alcohol. See total length and fork length. In Holocephali the length is usually taken from the tip of the snout to the origin of the upper caudal fin because the caudal filament breaks off frequently. In Scaridae it is taken back to the rear margin of the second to last lateral line scale, because the large scales obscure the point of caudal flexure. In small dead fish, the end point is detected by bending the caudal fin to one side. In fishery work, as a result of the use of the measuring board, standard-, fork- and total length are taken from the most anterior part of the head. Abbreviated as SL. (FishBase) 2) Standard length (SL) refers to 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. Simply put, this measurement excludes the length of the caudal fin. (Wikipedia) Standard length measurements are used with Teleostei (most bony fish), while total length measurements are used with Myx…
is trait of: Traits:TaxonSpecificBodySizeFish
label: Standard length (SL)
reference: https://en.wikipedia.org/wiki/Fish_measurement
reference: http://www.fishbase.org/Glossary/Glossary.php
wiki page modification date: 2016-12-19T14:22:17Z
modification date-23aux: 2457742.0988079
wiki page sort key: StandardLength
URL: http://www.marinespecies.org/traits/wiki/Traits:StandardLength

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