How to Identify Western Butterfish

To identify Western Butterfish (Pentapodus vitta), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The body is generally silvery-white to pale yellow, with a prominent yellow or golden stripe running horizontally from the snout through the eye to the caudal peduncle. Above this stripe, there is often a darker, sometimes purplish-brown, stripe. The fins are typically yellowish, with the caudal fin often having a darker margin or blotch. Juveniles may exhibit more pronounced banding.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Elongated, fusiform body., A single, prominent yellow or golden stripe along the flank., Upper lobe of the caudal fin extended into a long filament., Small, conical teeth in both jaws.

Dorsal fin

Single dorsal fin with 10 spines and 9 soft rays. The spines are relatively strong, and the soft-rayed portion is slightly higher.

Tail fin

Forked caudal fin, with the upper lobe extended into a long, filamentous streamer, particularly noticeable in adults.

Pectoral fin

Pectoral fins are moderately long and pointed, typically with 16-17 rays.

Distinctive fins

Pelvic fins are thoracic, located below the pectoral fins, with 1 spine and 5 soft rays. Anal fin has 3 spines and 7 soft rays.

Identification Tips

1. 1

   Body Stripe

   Look for the distinctive bright yellow or golden stripe running horizontally along the side of the body, from the snout to the tail base. This is the most reliable field mark.

2. 2

   Caudal Fin Filament

   Observe the upper lobe of the caudal fin for a long, trailing filament. This feature is more pronounced in adult specimens.

3. 3

   Overall Body Shape

   Note the elongated, somewhat slender body shape, typical of whiptail breams.

4. 4

   Geographic Location

   Confirm the location of observation is within its known range in the Indo-West Pacific, particularly Western Australia.

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