- Scientific name: Epalzeorhnychos kalopterum
- Synonyms: Epalzeorhynchos kalopterus, Barbus kalopterus
- Common name: Flying Fox
- Group: Cyprinids
- Habitat: Asia; southern Thailand, Malaysia, Borneo, Sumatra and Java
- Size: 16 cm
- Biotope: Inhabits over sandy or rocky substrates in fast-flowing streams and rivers in foothill areas.
- Social behavior: The small specimens are rather shy, and tend to hide during the day, but they often become territorial towards similar-looking species as they get older. In nature they live a solitary lifestyle, so it should be kept singly in the aquarium.
- Diet: Omnivorous; in nature they eat alage, insects and invertebrates. In the aquarium give them live and frozen foods, quality dried foods, vegetables and fruits.
- Breeding: It has not been bred in aquaria.
- Tank: Minimum 250 litres
- Population: 1 fish for 250 litres
- Decoration: Use a sand or gravel substrate with some larger smooth rocks. Decorate the aquarium with some bogwood or roots. Provide plenty of hiding places and shady areas.
- Temperature: 22-26 °C
- pH: 6-7.5
- Hardness: 5-12 NK°
- Lifespan: 8-10 years
Description: The flying fox has an elongated body with a flat belly. The back of the fish is light brown or dark brown, while under the lateral line it is light yellow or white. A dark lateral band extends from the snout, through the eye to the caudal fin. Above the dark line there is a slender gold stripe. It is very similar to the Siamese algae eaters (Crossocheilus oblongus), but the simplest way to identify the flying fox is by the characteristic white-edged, red and black coloured fins and the two pairs of barbels. The iris of the eye may be red.
It is possible to keep a small group of flying fox in a large aquarium with lots of hiding places, but each specimen needs a large territorry. Sexually mature females are noticeably thicker-bodied than males but it is impossible to accurately sex young fish.