How to Identify Harlequin Rasbora

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

Physical Characteristics

Body shape

compressed

Coloration

The body is typically coppery-orange to reddish, sometimes with a pinkish hue. The most prominent feature is a large, triangular or wedge-shaped black patch on the posterior half of the body, extending from just behind the dorsal fin to the caudal peduncle. The fins are generally translucent, sometimes with a reddish tint.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Prominent black triangular patch on the flank, Coppery-orange to reddish body coloration, Small, slender body reaching up to 4.5 cm (1.8 inches) in 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 or slightly tinted, lacking prominent markings other than the body coloration.

Identification Tips

1. 1

   Black Triangular Patch

   The most definitive feature is the large, wedge-shaped black marking on the posterior half of the body. This patch is unique in its shape and placement among similar small cyprinids.

2. 2

   Body Coloration

   The vibrant coppery-orange to reddish body color, especially when healthy, is a strong indicator. This color can vary in intensity depending on diet, water parameters, and stress levels.

3. 3

   Size and Shape

   Its small, compressed body, typically reaching 4-4.5 cm, helps distinguish it from larger or differently shaped rasbora species.

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