Devario Laoensis

Datasheet

General Description

Devario laoensis, commonly known as the Lao Danio, is a small fish from the Cyprinidae family typically growing up to 6.5cm in length. It features a dark, horizontal P stripe along its body, extending to the base of the caudal fin, and is distinguished from other species by its color pattern. The species is schooling by nature and thrives in larger aquariums with robust, similarly-sized tankmates.

Aquarium Setup

The Devario laoensis is likely to thrive in an aquarium setup resembling a flowing stream or river. The tank should have a substrate of variably-sized, water-worn rocks, sand, and fine gravel, potentially with driftwood roots or branches. Although most aquatic plants may struggle, hardy varieties like Microsorum, Bolbitis, or Anubias spp. can be attached to the decor. The fish require spotless water conditions with a high proportion of dissolved oxygen and moderate water movement. Regular water changes of 30-50% volume are recommended, and a secure cover is essential due to the species' tendency to jump.

Behaviour

Considered non-aggressive, but due to their constant activity and vigorous feeding behavior, Devario laoensis may disturb slower or timid tankmates. Maintaining them in a group of at least 8-10 individuals can reduce skittishness and create a more natural display. In a group setting, aggression is typically contained as the fish establish a hierarchical structure, with males displaying enhanced colors in the presence of rivals.

Feeding and Diet

In the wild, Devario laoensis predominantly feeds on insects and larvae. In an aquarium, they are versatile eaters readily accepting various foods. A staple diet of high-quality dried products can be supplemented with live or frozen options like bloodworm, Daphnia, or Artemia to enhance coloration and overall conditioning.

Reproduction & Dimorphism

Sexual dimorphism in Devario laoensis is evident in sexually mature females, which are rounder-bellied, less colorful, and slightly larger than males. During breeding, dominant males display bright orange on the lower half of their bodies. Successful reproduction can be encouraged in a well-established group with appropriate breeding conditions.

Habitat and Distribution

Devario laoensis is native to northwestern Laos and various locations within the upper Mekong watershed in Laos and Thailand. It prefers hill streams and small rivers with gravel substrates, rocks, and marginal vegetation. The species is known to occur alongside other fish species like Danio roseus and Schistura sertata in its natural habitat.