老挝

Overview

The side stripe of Devario laoensis begins faintly near mid-body, then becomes broader and darker toward the tail base, where it ends. This active social fish is rarely encountered, so practical care should include close observation of the individuals obtained.

Distribution & habitat

Confirmed records lie in the upper Mekong drainage of Laos and Thailand, including Chiang Rai; Chiang Mai remains less certain. Upland rocky streams and small rivers with marginal cover are probable habitats, with flow responding to seasonal rain. Sites include waters below Kuang Si Falls and tributaries of the Nam Ou. An older Salween report lacks corroborating records.

Aquarium setup

Care used for relatives suggests a clean stream-style aquarium of sand, gravel, rounded stones, wood and hardy attached plants. Good oxygenation and moderate circulation are likely suitable. Weekly changes of around a third to half of the water help limit organic buildup. A secure lid is necessary, with the fish's adjustment monitored rather than assumed.

Diet & feeding

Insects and larvae are thought to dominate wild feeding. Aquarium fish generally accept a broad menu. Supplement good prepared food with regular small live or frozen meals.

Behaviour & compatibility

Major aggression is thought unlikely, but strong feeding and swimming activity may overwhelm slow or shy fishes. Robust companions of similar size and matching needs are more appropriate. A shoal of at least eight to ten helps improve confidence and encourages stronger male displays.

Sexual dimorphism

Mature females are expected to be slightly larger, fuller-bellied and paler. Dominant males in breeding condition develop bright orange across the lower body.

Notes

The rearward-thickening stripe that stops at the tail base is a useful field mark. In some similar fishes the stripe continues along the tail rays, so close examination is preferable to relying on a general resemblance.