How to Identify Hengeli Rasbora

To identify Hengeli Rasbora (Trigonostigma hengeli), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is generally translucent, ranging from a silvery-pink to a coppery-orange hue. A prominent, elongated, wedge-shaped black marking extends from the mid-body towards the caudal fin, tapering to a point. Above this black mark, there is often a distinct iridescent orange or copper stripe, which gives rise to its 'Glowlight' or 'Copper Harlequin' common names. Fins are typically hyaline (transparent) with a slight reddish tint, especially in males.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Elongated, wedge-shaped black marking on the flanks, tapering towards the caudal fin., Iridescent orange/copper stripe above the black marking., Small adult size, typically reaching 2.5-3 cm (1-1.2 inches) in total length.

Dorsal fin

Single, relatively small, located mid-body.

Tail fin

Forked, symmetrical.

Pectoral fin

Paired, small, located ventrally behind the operculum.

Distinctive fins

All fins are generally transparent, sometimes with a faint reddish or yellowish tint, especially during breeding.

Identification Tips

1. 1

   Body Markings

   Look for the distinct, elongated, wedge-shaped black mark that starts roughly mid-body and extends towards the caudal peduncle, tapering to a point. This mark is typically bordered dorsally by an iridescent orange or copper stripe.

2. 2

   Size

   Adults are small, usually not exceeding 3 cm (1.2 inches) in total length.

3. 3

   Coloration

   The overall body color is translucent, often with a coppery or pinkish sheen, especially under certain lighting conditions.

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