How to Identify Galaxy Rasbora

To identify Galaxy Rasbora (Celestichthys margaritatus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dark, iridescent blue-black body with numerous small, pearlescent (white to golden) spots. Fins are typically red-orange with two distinct black bands, particularly on the dorsal and anal fins. Males exhibit more intense coloration, especially during breeding.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Small size, typically 2-2.5 cm (0.8-1 inch) standard length., Distinctive 'galaxy' pattern of pearlescent spots on a dark body., Red-orange fins with black banding., Males have brighter red fins and a more intense body coloration, particularly on the belly which can be reddish-orange during spawning., Females are generally duller in color, with a less vibrant belly and a rounder body shape.

Dorsal fin

Single, relatively short dorsal fin, typically red-orange with black banding.

Tail fin

Forked caudal fin, often with red-orange coloration and clear margins.

Pectoral fin

Small, clear to slightly reddish pectoral fins.

Distinctive fins

Anal fin also exhibits red-orange coloration with black banding, similar to the dorsal fin. Pelvic fins are small and often clear or faintly colored.

Identification Tips

1. 1

   Size and Shape

   Look for a very small, slender fish, typically under 2.5 cm. Its body is somewhat compressed laterally.

2. 2

   Coloration and Pattern

   The most defining feature is the dark, almost black, body covered in numerous small, iridescent white or golden spots, resembling a star-filled night sky. This pattern is unique among similar small cyprinids.

3. 3

   Fin Coloration

   Observe the fins, especially the dorsal and anal fins, which are typically red-orange with two prominent black bands. This combination of body spots and fin coloration is diagnostic.

4. 4

   Sexual Dimorphism

   Males are more intensely colored, particularly the red in their fins and a reddish flush on their belly, especially when breeding. Females are rounder and less vibrant.

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