How to Identify Red Tail Rasbora

To identify Red Tail Rasbora (Rasbora borapetensis), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The body is generally silvery-gold to olive-brown, with a prominent dark lateral stripe extending from behind the gill cover to the base of the caudal fin. Above this stripe, there is often a thinner, iridescent golden-orange stripe. The most striking feature is the caudal fin (tail), which is bright red-orange, sometimes with black markings at the base of the lobes. The dorsal fin may have a reddish tint, and other fins are typically hyaline (clear).

Scale type

cycloid

Mouth position

terminal

Distinctive features

Bright red-orange caudal fin, Dark lateral stripe with an iridescent golden stripe above it, Slender, torpedo-shaped body

Dorsal fin

Single, relatively small, located mid-body, often with a reddish tint.

Tail fin

Forked, bright red-orange, sometimes with black markings at the base of the lobes.

Pectoral fin

Small, clear, positioned ventrally.

Distinctive fins

The vibrant red-orange caudal fin is the most distinctive feature, giving the fish its common name. The dark lateral stripe is also a key identifier.

Identification Tips

1. 1

   Caudal Fin Coloration

   The most reliable identifier is the bright red-orange caudal fin, which is often bordered by black at the base of the lobes.

2. 2

   Lateral Stripe Pattern

   Look for a distinct dark lateral stripe running from the operculum to the caudal peduncle, often accompanied by a thinner, iridescent golden stripe directly above it.

3. 3

   Body Shape and Size

   It has a slender, elongated body, typically reaching a maximum standard length of 3.5-4.0 cm (1.4-1.6 inches).

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