Blackline rasbora

Rotschwanzbärbling ( Rasbora borapetensis )

The Rotschwanzbärbling ( Rasbora borapetensis ), also called Rotschwanzrasbora or Rotflossenrasbora, is a small freshwater fish that occurs in Thailand in the basin of the Mekong River, the Chao Phraya and the north of the Malay Peninsula to Kuala Terengganu.

Features

The Rotschwanzbärbling has reached an elongated laterally flattened body of a maximum length of 5 cm. The body is oliver to greenish yellow color. A dark brown to black longitudinal band, which is bounded at the top of a golden green line, extending from the rear edge of the gill cover to the base of the caudal fin. Black lines are drawn along the midline of the back and along the anal-fin base. The fins are colorless, the tail fin base red. The extent of the red coloration varies from population to population. In some populations, the dorsal fin or only its base is red. Females are plumper than the males. The mouth is terminal. The Rotschwanzbärbling one of the few striped Rasbora species that have only an incomplete lateral line. It extends only to the anterior margin of the anal fin.

• Fins formula: Dorsal 2/7, Anal 3/5, pectoral 1/12, Anterior 2/8.
• Dandruff formula: MLR 29-30, SL 10-15.

Way of life

Rotschwanzbärblinge live in larger and smaller social groups in rivers and stagnant waters. Hold on near the surface or in mid -water zones. They feed mainly on insects that have fallen onto the water surface, zooplankton, crustaceans and worms.

Hunting and

The Rotschwanzbärbling was introduced in 1954 for the first time in Germany.