Red tailed harlequin
Red tailed harlequin | ||||||||||||
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Red tailed harlequin ( rasbora borapetensis ) |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Rasbora borapetensis | ||||||||||||
HM Smith , 1934 |
The red-tailed harlequin ( Rasbora borapetensis ), also known as red-tailed rasbora or red-finned rasbora , is a small freshwater fish that occurs in Thailand in the Mekong , Mae Nam Chao Phraya and in the north of the Malay Peninsula as far as Kuala Terengganu .
features
The red tailed harlequin has an elongated, laterally flattened body that reaches a maximum length of 5 cm. The body is from olive to greenish-yellow basic color. A dark brown to black longitudinal band, which is bordered at the top by a green-gold line, extends from the rear edge of the gill cover to the base of the caudal fin. Black lines run along the midline of the back and along the base of the anal fin. The fins are colorless, the base of the caudal fin is red. The extent of the red coloration varies from population to population. In some populations, the dorsal fin or just its base is also red. Females are fuller than males. The mouth is terminal. The red-tailed harlequin is one of the few longitudinally striped Rasbora species that only have an incomplete sideline . It only extends to the front edge of the anal fin.
- Fin formula : dorsal 2/7, anal 3/5, pectoral 1/12, ventral 2/8.
- Scale formula : mLR 29–30, SL 10–15.
Way of life
Red-tailed rasbora live in larger and smaller social groups in running waters and stagnant waters. They stay near the surface or in middle water zones. They mainly feed on insects that have fallen on the surface of the water, zooplankton, crustaceans and worms.
Aquaristics
The red-tailed harlequin was introduced to Germany for the first time in 1954.
literature
- Hans A. Baensch , Rüdiger Riehl : Aquariums Atlas, Volume 1 . Mergus Verlag, 1997, ISBN 3-88244-101-1 .
- Günther Sterba (Ed.), Gert Brückner: Encyclopedia of Aquaristics and Special Ichthyology. Neumann-Neudamm, Melsungen u. a. 1978, ISBN 3-7888-0252-9 .
- Günther Sterba: The world's freshwater fish. 2nd Edition. Urania, Leipzig / Jena / Berlin 1990, ISBN 3-332-00109-4 .
- Axel Zarske: Rasbora borapetensis HM Smith, 1934. Redfin Rasbora. In: Claus Schaefer, Torsten Schröer (Hrsg.): The large lexicon of aquaristics. Eugen Ulmer, Stuttgart 2004, ISBN 3-8001-7497-9 , p. 847.
Web links
- Red tailed harlequin on Fishbase.org (English)
- Rasbora borapetensis inthe IUCN 2013 Red List of Threatened Species . Listed by: Vidthayanon, C., 2011. Retrieved December 17, 2013.