How to Identify Harlequin Rasbora

To identify Harlequin Rasbora (Rasbora heteromorpha), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is generally a coppery-orange to pinkish-red, fading to a lighter belly. The most prominent feature is a large, triangular to hatchet-shaped black patch on the posterior half of the body, extending from below the dorsal fin to the caudal peduncle. The fins are typically hyaline (clear) with a reddish tint.

Scale type

cycloid

Mouth position

superior

Distinctive features

Prominent black triangular patch on the flank., Coppery-orange to pinkish-red body coloration., Small adult size, typically 2.5-3.5 cm (1-1.4 inches) standard length.

Dorsal fin

Single, relatively small, located mid-body.

Tail fin

Forked, with rounded lobes.

Pectoral fin

Small and clear, positioned ventrally.

Distinctive fins

All fins are generally clear to slightly reddish, lacking prominent markings other than the body patch.

Identification Tips

1. 1

   Black Triangular Patch

   The most definitive feature is the large, distinct black triangle or 'hatchet' shape on the posterior half of the body. This patch is typically bordered by a thin, iridescent golden line.

2. 2

   Body Coloration

   Observe the overall body color, which ranges from a coppery-orange to a reddish-pink, especially when healthy and in optimal conditions.

3. 3

   Size and Shape

   Note the small, compressed body shape, typically reaching an adult size of 2.5-3.5 cm (1-1.4 inches) standard length.

4. 4

   Mouth Position

   The mouth is slightly upturned (superior), indicating a feeding preference for surface or mid-water prey.

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