How to Identify Korean Rainbow Shiner

To identify Korean Rainbow Shiner (Tanichthys chongqingensis), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The body is generally silvery-gold to olive-brown, with a prominent iridescent lateral stripe that can display hues of blue, green, and red, especially under certain lighting and when the fish is healthy and displaying. Fins are often translucent with reddish or yellowish tints, and the caudal fin typically has a distinct red spot or margin, sometimes bordered by white or yellow.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Iridescent lateral stripe extending from the operculum to the caudal peduncle., Reddish coloration on the caudal fin, often with a white or yellow margin., Small, slender body, typically reaching 2.5-3.5 cm (1.0-1.4 inches) in total length., Absence of barbels.

Dorsal fin

Single, short-based dorsal fin located posterior to the pelvic fins, typically with 7-8 branched rays.

Tail fin

Forked caudal fin, often with vibrant red and white/yellow coloration.

Pectoral fin

Small, clear pectoral fins, typically with 10-12 rays.

Distinctive fins

Pelvic fins are small and located abdominally. Anal fin is similar in shape to the dorsal fin but slightly longer, with 8-9 branched rays.

Identification Tips

1. 1

   Size and Shape

   Small, slender fish, rarely exceeding 3.5 cm (1.4 inches) in length. Body is fusiform.

2. 2

   Coloration

   Observe the iridescent lateral stripe and the distinct red and white/yellow markings on the caudal fin. The overall body color can vary from silvery to olive-brown.

3. 3

   Fin Structure

   Note the single dorsal fin and the forked caudal fin. The absence of barbels is a key characteristic for the genus Tanichthys.

4. 4

   Behavior

   Often seen schooling in the mid to upper water column, especially when kept in groups.

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