半线

Overview

Devario interruptus is an upland fish with short broad flank bars and a rear stripe formed from adjoining dark blotches. Captive experience is limited, so housing and companion choices should remain open to adjustment as the fish are observed.

Distribution & habitat

Known sites cluster around the Husa valley of Longchuan and nearby Longling and Ruili in southwestern Yunnan. They belong to the upper Irrawaddy drainage near Myanmar. Most records concern shallow, narrow, clear streams over sand and stones, with moderate or brisk flow and little aquatic vegetation. Bankside plants may shade the water. A turbid irrigation channel has also yielded specimens.

Aquarium setup

A relatively cool, well-maintained stream aquarium is a reasonable approach. Use sand, gravel, smooth stones and wood, adding hardy attached plants if desired. Good oxygenation, moderate circulation and weekly changes of roughly a third to half of the volume are suggested. Secure the cover against jumping. These husbandry proposals derive mainly from relatives and need practical observation.

Diet & feeding

Insects and larvae are the probable main wild foods. Try quality prepared food supplemented with small live or frozen invertebrates, checking feeding response and condition.

Behaviour & compatibility

Aggression is thought unlikely, but constant movement and energetic feeding may still intimidate quiet companions. Robust, similarly sized fishes suited to cool flowing water are more promising choices. Eight to ten conspecifics are suggested; a group may help contain ranking disputes, though actual behavior needs monitoring.

Sexual dimorphism

Females are expected to become larger, fuller-bellied and less colorful. Dominant reproductive males develop strong orange coloration across the lower body.

Breeding

A trial may follow general devario egg-scattering methods: a separate dim aquarium with established water, gentle aeration and fine plants or mesh protecting the eggs. Introduce conditioned pairs and remove them after spawning, or after about two days if spawning was not observed. Begin fry feeding with microscopic foods and gradually progress to larger items. Outcomes should be established from observation rather than assumed.

Notes

Absent barbels, an incomplete lateral line and similarly deep, broad flank bars help distinguish the species. These structural and pattern features are more useful than reproductive orange coloration alone.