Mystacoleucus Atridorsalis

Datasheet

General Description

Mystacoleucus atridorsalis is a small cyprinid species characterized by its body depth fitting 2.5-2.7 times in its standard length (SL), 28-31 +2-3 lateral line scales, a triangular distal blotch on the dorsal fin, and a dark posterior margin on the caudal fin. This species possesses a unique trait of a procumbent predorsal spine which can be challenging to spot without close observation, a feature shared with other genera like Tor, Spinibarbus, and Paraspinibarbus.

Aquarium Setup

The ideal aquarium setup for M. atridorsalis involves a well-maintained tank with ample swimming space and areas for hiding. A gravel substrate and natural aquatic plants should be incorporated to mimic the fish's natural habitat. Water parameters should be closely monitored to ensure they are within the specified range (see table).

Behaviour

Being a pelagic species, M. atridorsalis prefers flowing lowland river channels but shows flexibility by moving into flooded forests during the wet season. It has also been observed in swiftly-flowing forest streams with gravel substrates. Care must be taken when handling the fish due to the entangling nature of its predorsal spine.

Feeding and Diet

In the wild, M. atridorsalis exhibits omnivorous feeding habits, consuming a variety of aquatic invertebrates, organic detritus, and algae. In an aquarium setting, a balanced diet consisting of high-quality flake food, pellets, and occasional live or frozen foods like bloodworms and brine shrimp is recommended to maintain its health and vitality.

Reproduction & Dimorphism

Information regarding the reproduction and dimorphism of M. atridorsalis is not detailed in the available data.

Habitat and Distribution

Endemic to the lower Mekong River basin spanning Laos, Thailand, and Cambodia, M. atridorsalis can be found in major tributaries such as the Xe Bang Fai in Laos and the Mun and Songkhram watersheds in Thailand. It is important to note that records from central and western Thailand are often misidentifications and do not represent M. atridorsalis.