How to Identify Opah

To identify Opah (Lampris guttatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Vibrant, iridescent coloration. Dorsal surface is typically dark blue to purplish, fading to silvery-orange or rose on the flanks and belly. Covered with numerous white spots. Fins are bright red or orange.

Scale type

none

Mouth position

terminal

Distinctive features

Large, disc-shaped, laterally compressed body., Large eyes., Small, protractile mouth., Absence of scales on the body, though some sources describe minute, deciduous scales., Vibrant red or orange fins., Unique endothermic physiology, maintaining a body temperature several degrees warmer than ambient water.

Dorsal fin

A single, long-based dorsal fin, often with a high anterior lobe, extending along much of the back. No spines.

Tail fin

Large, deeply forked caudal fin, bright red.

Pectoral fin

Long, scythe-like pectoral fins, inserted high on the body, bright red.

Distinctive fins

Pelvic fins are also long and red, positioned ventrally. Anal fin is long-based and red, mirroring the dorsal fin.

Identification Tips

1. 1

   Body Shape

   Look for its distinctive, large, disc-shaped, and laterally compressed body, resembling a large, colorful dinner plate.

2. 2

   Coloration

   Identify by its striking iridescent blue-purple dorsal, silvery-orange flanks, and bright red/orange fins, often adorned with white spots.

3. 3

   Fin Structure

   Note the long, scythe-like pectoral fins and the deeply forked caudal fin, both typically bright red.

4. 4

   Size

   Adults can reach up to 2 meters (6.6 feet) in length and weigh over 270 kg (600 lbs), making it a very large fish.

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