Morphometric measurement of fishes
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This document discusses various morphometric measurements that can be taken when analyzing fish specimens. It lists 31 specific linear measurements that are commonly used, such as total length, fork length, standard length, head length, pre-dorsal length, and measurements of fins and other body parts. The measurements are useful for identification, comparisons between specimens, and studies of growth and maturity. References are provided for additional resources on fish morphology and measurement techniques.
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Morphometric measurement of fishes
- 1. Morphometric measurement Presented by – Abhishek Giri M.Sc. (Part – II), SEM – IV R.K.Talreja College UNR-3 17/03/15
- 2. 17/03/15
- 3. Introduction • Linear measurement • Lowe-McConnel(1971) & Grant & Spain (1975). 17/03/15
- 4. Points to consider 1. Total length: Maximum elongation from end to end. Anterior most to the tip of the tail (0.1 cm), In case of differing length of caudal fin, the longest is taken. 2. Fork length: Distance from anteriormost part to the anterior limit of the median notch or the bifurcation of the caudal fin. 3. Standard length: measurement from the tip of the snout or premaxilla to the base of the caudal fin (hypural joint), where a groove forms. 4. Head length: Distance between the snout or premaxilla & the posterior most edge of the opercular bone. 17/03/15
- 5. 5. Pre-dorsal length: Distance from anteriormost part of the body to the first dorsal fin ray. 6. Pre-orbital or snout length: Distance from the anteriormost part of the body to the front margin of the orbit. 7. Post-orbital length: Distance from the posterior margin of the orbit to the end of the two orbitals. 8. Inter orbital width: from the upper margin of the right orbit to the upper margin of the left orbit as measured from the dorsal surface. This measurement is also called as the least distance between the two orbitals. 9. Eye diameter: Distance between the anterior & posterior rims of the eye in the longitudinal axis. 17/03/15
- 6. 10. Upper jaw length: from the anteriormost post of the premaxillary to posterior point of the maxillary. 11. Lower jaw length: Distance between the two end point along the margin of the lower jaw. 12. Anal length: Distance from the anteriormost part to the anterior limit of the anal aperture. 13. Girth length: circumference of the body at its deepest point. This measurement sometimes indicates maturity of the species particularly in females fishes. 14. Body depth: It is the deepest between the dorsal & ventral surface at the deepest point. 15. Head depth: Perpendicular distance from the nape to the ventral side of the head. 17/03/15
- 7. 16. Gape width: Also termed as width of mouth. It is the distance between the angles of the closed mouth. 17. Dorsal fin height: Length of the largest fin ray or spine of the dorsal fin. 18. Dorsal fin base: Distance between the anterior & posterior end of dorsal fin taken along the base of the fin. 19. Pectoral fin length: length of the ray from the dorsal base of the pectoral fin. 20. Pectoral fin base: Distance between the dorsal & ventral insertion of the anal fin. 21. Anal fin length: Length of the longest ray from the anterior insertion of the anal fin. 17/03/15
- 8. 22. Anal fin base: Distacne between the anterior & posterior insertion of the anal fin. 23. Ventral fin length: Length of longest ray from the anterior insertion of the ventral fins. 24. Ventral fin base: Distacne between the outer side bases of the ventral fins. 25. Depth of mouth: Distacne between the dorsal & ventral surface of the head, perpendicularly through th posterior angle og th emouth. 26. Depth at eye: Distacne between the dorsal & the ventral surfaces of the head, perpendicularly through the eye. 27. Depth at dorsal fin: depth of the body, perpendicularly trough the anterior insertion of the caudal fin. 17/03/15
- 9. 28. Depth at pectoral fins: Depth of the body, perpendicularly through the base of the pectoral fin. 29. Depth at anus: Depth of the body, perpendiculalrly through the anus. 30. Caudal fin height: Distacne between the stretched lobes of the caudal fin. 31. Length of the peduncle: Distance from the end of the anal fin the base of the median caudal rays. 32. Least height of the caudal peduncle: Also termed as least height of the body. Shortest height of the caudal peduncle between the end of the anal fin & origin of the caudal fin 17/03/15
- 10. 17/03/15
- 11. References • S.P. Biswas, Manual of methods in fish biology, South Asian publishers private Ltd., New Delhi. • courses.washington.edu/fish311/Lab1 7.pdf • cfcc.edu/faculty/rogers/courses/msc27 6/Meristics%20laboratory.doc 17/03/15