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Identification of Fishes:
To identify species of a fish following tools are used.
 Morphometric
- measurements relative to length
 Meristic
- counts
 Anatomical traits - shape, presence/absence
 Color patterns
Meristic: (Counting)
1. Scale counts:
Lateral line scale count
Scales above lateral line
Scales below lateral line
Scales before dorsal fin
Identification of Fish Species
2. Fin (Ray and Spines) count:
 Spines: Single‐shafted, entire composition,
designated by roman numerals.
 Soft rays: Bilaterally paired, segmented, branched,
flexible, designated by Arabic numerals.
 Fin formulae: Counting of each fin ( number of Spines and
Rays)
 A fin may contain them both.
 Example: D XIII 12, A III 15, P 6, V I 6, C 9
 (D dorsal, A – anal, P – pectoral, v – ventral or pelvic, C –
caudal).
Morphometric: (Measurement)
 Standard length (From snout to base of caudal fin)
 Head length ( Snout to Operculum)
 Snout length (Diatance between eye orbit and mouth tip)
 Dorsal Fin Length
 Pelvic fin length
 Pectoral fin length
 Caudal fin length
 Anal fin length
Eye orbit Length
Upper jaw length
Body depth
 Pointed dividers or dial‐reading
calipers are used.
Measurements are recorded in% of
Standard length.
Procedure:
 Take sample fish, Take more then one fish
as sample.
 Collect Required Standard data bout fish
in published form.
 Take observation of Morphometric and
meristic.
 Tele your observations with standard
readings.

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Identification of Fish Species

  • 1. Identification of Fishes: To identify species of a fish following tools are used.  Morphometric - measurements relative to length  Meristic - counts  Anatomical traits - shape, presence/absence  Color patterns
  • 2. Meristic: (Counting) 1. Scale counts: Lateral line scale count Scales above lateral line Scales below lateral line Scales before dorsal fin
  • 4. 2. Fin (Ray and Spines) count:  Spines: Single‐shafted, entire composition, designated by roman numerals.  Soft rays: Bilaterally paired, segmented, branched, flexible, designated by Arabic numerals.  Fin formulae: Counting of each fin ( number of Spines and Rays)  A fin may contain them both.  Example: D XIII 12, A III 15, P 6, V I 6, C 9  (D dorsal, A – anal, P – pectoral, v – ventral or pelvic, C – caudal).
  • 5. Morphometric: (Measurement)  Standard length (From snout to base of caudal fin)  Head length ( Snout to Operculum)  Snout length (Diatance between eye orbit and mouth tip)  Dorsal Fin Length  Pelvic fin length  Pectoral fin length  Caudal fin length  Anal fin length
  • 6. Eye orbit Length Upper jaw length Body depth  Pointed dividers or dial‐reading calipers are used. Measurements are recorded in% of Standard length.
  • 7. Procedure:  Take sample fish, Take more then one fish as sample.  Collect Required Standard data bout fish in published form.  Take observation of Morphometric and meristic.  Tele your observations with standard readings.