How to Identify Yellowback Damsel

To identify Yellowback Damsel (Pomacentrus notatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Body generally dark brown to black, often with a bluish sheen. The most distinctive feature is a bright yellow to yellowish-orange area on the posterior dorsal region, extending onto the soft-rayed portion of the dorsal fin. The caudal fin is typically dusky to translucent, sometimes with a yellowish tinge. Juveniles may exhibit a more pronounced yellow coloration.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Bright yellow to yellowish-orange patch on the posterior dorsal region and soft dorsal fin., Dark body coloration, often with a bluish cast., Relatively small size, reaching up to 10 cm (4 inches) in total length.

Dorsal fin

Single dorsal fin with 13 spines and 14-16 soft rays. The soft-rayed portion is often yellow.

Tail fin

Caudal fin emarginate to slightly forked, typically dusky or translucent.

Pectoral fin

Pectoral fins are clear to slightly dusky.

Distinctive fins

Anal fin with 2 spines and 14-16 soft rays. Pelvic fins are dark.

Identification Tips

1. 1

   Dorsal Coloration

   Look for the prominent yellow to yellowish-orange patch on the posterior back and soft dorsal fin. This is the most reliable distinguishing feature.

2. 2

   Body Color

   The rest of the body is typically dark brown to black, sometimes with a subtle blue iridescence.

3. 3

   Size

   Adults are relatively small, usually not exceeding 10 cm (4 inches).

4. 4

   Habitat

   Observe its behavior in rocky or coral reef environments, often darting among crevices.

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