Dario dayingensis

Overview

The small Yunnan badid Dario dayingensis was once misidentified as Dario dario but is closer to Dario hysginon. A retiring manner and deliberate feeding favor a dedicated aquarium for monitoring condition and attempting reproduction.

Distribution & habitat

The type locality is a small Daying tributary near Jiucheng in Yingjiang County, Yunnan, China; additional records come from Tengchong farther north. The Daying belongs to the Ayeyarwady system.

The agricultural stream lies just above 900 m elevation, measures about 2 m across and under 30 cm deep, and flows briskly over stones, sand, leaves, and mud. Fish gather among submerged bankside plants rather than remaining exposed in the main current. Collections have also included introduced fishes, so not every recorded companion represents an undisturbed native assemblage.

Aquarium setup

Provide soft substrate or fine gravel with extensive planted shelter. Cryptocoryne, attached Microsorum, Anubias, and Taxiphyllum are suitable; moss also offers potential spawning surfaces. Branches, floating cover, and leaves help divide the aquarium.

A pair or one male with several females can start in a 45 cm tank. More males require additional space and visual barriers. Spread caves, boundaries, and spawning material around separate areas. Maintain appropriate stable soft water rather than using seasonal field extremes as everyday targets.

Diet & feeding

The genus takes small aquatic crustaceans, worms, insect larvae, and zooplankton. Offer appropriately small live or frozen foods, including Artemia nauplii, Daphnia, microworms, and banana worms.

These cautious feeders must receive food before companions consume it. Bloodworms and Tubifex are associated with obesity and health concerns and are best omitted.

Behaviour & compatibility

Prefer a species aquarium. It is not a shoaling fish; a pair or single male with several females suits limited space. Rival males can fight strongly, so several require independent territories and cover.

If companions are included, choose peaceful small upper-water fishes or suitable miniature loaches. Avoid large, busy, or strongly competitive feeders. Continued access to food matters even when no obvious chasing is visible.

Sexual dimorphism

Mature males become much more colorful and develop extended pelvic, dorsal, and anal fins. Females are smaller and have a shorter, rounder profile.

Breeding

Reproduction is expected to resemble that of congeners, but the method is not confirmed for this species. Relatives form temporary pairs and spawn on solid surfaces. Males establish territories and intensify their colors; courtship may alternate rejection and renewed invitations for several days. A dominant male usually gains most breeding opportunities.

In those relatives, brief spawning deposits eggs beneath leaves or other solid surfaces. The female is then excluded while the male retains the territory. Moving egg-bearing material into a container with spawning-tank water, or removing the adults, can preserve young from predation.

As a comparative guide, eggs hatch after roughly two to three days and yolk absorption may take another week. First foods must be infusoria-sized, followed by microworms and Artemia nauplii as the young grow. Application here requires direct observation rather than assuming the same timetable.

Notes

Differences from Dario hysginon include palatine teeth and counts of scales and vertebrae. Color alone may not establish identity. Historical use of Badis dario for this fish is not evidence that they are the same species.