1. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Morphometrics
Morphometric characters - measurable features.
Measuring the linear dimension - widely used technique in finfish taxonomy.
Use
(i) total length, (ii) standard length and (iii) fork length.
Total length - related to many factors such as weight, age, fecundity, maturity, etc.
Total length easy to measure
Larger species with a deeply forked caudal fin - fork length
In large specimens standard length is not used - difficulty in ascertaining the posterior margin of the hypural plate.
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

2. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Methods of Measuring
Measurements - with special measuring boards – nose block (head piece).
Mouth – closed
Fish body and tail - straightened along the mid-line and the readings - recorded from the scale.
Record to the nearest 0.5 mm with a fine draftsman dividers
Disc width rather than overall length is sometimes used as linear dimension of rays.
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

3. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Measuring Board
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

4. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Definitions of Linear Measurements
Standard Length: Taken from U to the tip of the hypural bone (urostyle).
Fork Length: Measured from U or L to the cartilaginous tip of shortest or median caudal ray.
Total Length: Measured from U or L to the longest caudal fin ray, upper or lower, or an average of both of them.
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

5. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Positions
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

6. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Definitions of Position
U Maxillary symphysis L Mandibular symphysis O Anterior edge of orbit O’ Posterior edge of orbit J Posterior edge of mandible (buccal commissure) Y Gill-cover notch G’ Posterior bony edge of operculum G Posterior membranous edge of gill cover P Anterior point of insertion of the first pectoral fin ray D1 Insertion of anterior dorsal
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

7. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Definitions of Position (contd..)
F Cartilaginous tip of shortest (median) caudal ray F’ Membranous edge of caudal fin at fork N Distal tip of the longest caudal fin ray with lobe normally extended N’ Distal tip of the longest ventral fin ray with lobe normally extended M Point where line NN’ intersects median longitudinal axis M’ Mid point of line MN’ X Distal tip of longest dorsal caudal fin ray, with lobe brought to the median longitudinal axis X’ Distal tip of the longest ventral fin ray, with the lobe
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

8. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Overall Length Measurements
LT and UT Total length (any extreme or normal length) LX Dorsal extreme length LX’ Ventral extreme length LX’’ Greater extreme length (LX or LX’, whichever is greater) LN Dorsal normal length LN’ Ventral normal length LN’’ Greater normal length LN or LN’, whichever is greater LM Median normal length LM’ Mean normal length LP Mid caudal length LP’ Fork length LS Standard length to urostyle LS’ Standard length to peduncle LS’’ Standard length to keel LS’’’ Standard length to silvering LB (Dorsal) Body length
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

9. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Longitudinal Measurements
UJ Maxillary sheath length LJ’ Mandibular length UO Snout length UY Upper head length LG Opercular head length LG’ Greatest head length OO’ Orbital diameter ID Longitudinal iris diameter Ed Longitudinal pupil diameter O’Y Postorbital dorsal distance UDI Preanterior dorsal distance UP Prepectoral distance UV Preventral distance UD2 Preposterior dorsal distance D1D1’ Anterior dorsal fin base length D2D2’ Posterior dorsal fin base length UA Preanal distance AA’ Anal fin base length
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

10. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Vertical Measurements
Oh Orbital depth (from orbital crest to lower edge of maxillary, passing over middle of pupil) Ih Perpendicular Iris Diameter. Eh Perpendicular pupil diameter YJ’ Head length DIP Back depth (oblique) DIV Anterior dorsal depth (or dorsoventral depth) h Greatest depth D2Z Posterior dorsal depth D2A Dorsoanal depth (slightly oblique) h’ Perpendicular anal depth q (Least) peduncle depth
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

11. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Lateral Measurements
PP Pectoral breadth b Greatest breadth OO Inter-orbital distance (at level of pupil centre)
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

12. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Other Measurements
D1h Anterior dorsal height (distance from insertion to tip of longest spine) D2h Posterior dorsal height (distance from insertion to tip Ph Pectoral fin length Vh Ventral fin length Ah Anal fin height Ch Dorsal caudal fin length Ch’ Ventral caudal fin length Ch’’ Greater caudal fin length Ig Greatest iris diameter Eg Greatest pupil diameter g Greatest girth VV Length of interventral flap NN’ Spread caudal distance
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

13. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Morphometric Measurements of a Teleost
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

14. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Morphometric Characters of a Teleost
1. Total length 11. Base A2 fin 2. Fork length 12. Pelvic fin length 3. Head length 13. Pectoral fin length 4. Orbit 14. Curved lateral line (CLL) 5. Depth D1 – P2 15. Snout to D1 fin 6. Depth D2 - A2 16. Snout to D2 fin 7. Snout length 17. Snout to pelvic fin 8. Upper jaw length 18. Snout to pectoral fin 9. Base D2 fin 19. Snout to A2 fin 10. Straight lateral line (SLL)
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

15. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Parameters to be Calculated
In % of Total Length – each species
Range of ratio, Mean ratio, Standard deviation and Standard error - each species
Range of overlapping ratio, Overlapping ratio, Range of extreme ratio, Extreme ratio and % of overlapping – for two different species for comparison
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

16. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Morphometric Measurements of a Shark
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

17. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Measuring Total Length of a Shark
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

18. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Morphology and Morphometric Measurements of Rays
Preorbital length – Distance between snout to orbit
Postorbital length of disc – Distance between posterior part of orbit to anus
Body depth – Maximum distance across the body
Tail length – Distance between anus to the tip of posterior part of tail.
Other characters - similar to that of sharks and bony fishes.
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

19. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1
Morphology and Morphometric Measurements of Rays
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH

20. Author: Dr. JAWAHAR -TAXONOMY OF FINFISH
DEVELOPMENT OF E-COURSES FOR B.F.Sc COURSES TOPIC TOPIC: Classical Taxonomy- Morphometrics COURSE ID: DFB1 .
Thank you
Author: Dr. JAWAHAR -TAXONOMY OF FINFISH