Scarlet Badis (Dario dario) Care Guide
One of the smallest known percoid fish, the male displays stunning scarlet-red and blue barred coloration. Shy and retiring, it thrives in heavily planted nano tanks with gentle filtration.
Compiled by Aquairi from published sources · Published · Updated
Overview
Dario dario is a species in the family Badidae. One of the smallest known percoid fish, the male displays stunning scarlet-red and blue barred coloration. Shy and retiring, it thrives in heavily planted nano tanks with gentle filtration. Often requires live or frozen foods as it may refuse dried foods.
Taxonomy
- Family: Badidae
- Genus: Dario
- Scientific name: Dario dario
- Other names: Dario Dario, Scarlet Gem Badis
- Origin: South Asia, India
Habitat
Native to shallow, heavily vegetated streams and tributaries of the Brahmaputra drainage in West Bengal, India, and adjacent Bhutan. Inhabits clear, slow-moving water over sand and leaf litter among dense marginal plants. Among the smallest known percoid fishes.
Tank requirements
- Minimum tank volume: 20 L
- Temperature: 20-26 °C
- pH: 6-7.5
- GH: 2-10 °dGH
- Water flow: low
- Adult size: 1.5-2 cm
- Lifespan: 3-5 years
- Difficulty: intermediate
Diet
Classified as carnivore. Recommended feeding frequency: 2x daily. In captivity, offer a varied diet appropriate to the species — quality prepared foods supplemented with frozen or live items of suitable size.
Compatibility
- Temperament: peaceful
- Swimming level: middle
- Compatible tank mates: Ember Tetra, Cherry Shrimp, Pygmy Corydoras, Chili Rasbora
- Avoid with: Large Fish, Betta, Aggressive Species
Breeding
- Breeding strategy: egg-layer
- Breeding difficulty: intermediate
Scarlet Badis Breeding Guide
Overview
Dario dario is one of the smallest percoid fishes, with males not normally exceeding 2 cm and females smaller still at around 1.3 cm. The vivid scarlet-and-blue colouration and the extended fins of conditioned males make breeding both possible and visually distinctive. The species spawns in the manner of a substrate-spawner, with the male holding a small territory.
Sexing
Sexes are easy to distinguish once mature. Males develop seven iridescent blue vertical bars on the flanks and show extended pelvic, dorsal and anal fins. Females are smaller and far less colourful, lacking the red and blue pigmentation of the male.
Conditioning
Condition adults heavily on live and frozen foods, as this species rarely accepts dry food. Well-fed females fill with eggs and males intensify in colour and hold territory.
Breeding Setup
Provide a densely planted tank that lets each male claim a territory; roughly 30 square cm per male is suggested for groups. Suitable parameters are a temperature of 18-26 C, pH 6.5-8.5 and hardness of about 18-268 ppm. Broad-leaved plants give the male a spawning surface.
Spawning Behavior & Trigger
A male in condition makes a non-aggressive approach toward the female and appears to invite her into the centre of his territory. Spawning lasts only a few seconds, with eggs scattered in random fashion on the underside of a solid surface such as a plant leaf. The female is then ejected and the male takes sole responsibility.
Egg & Fry Care
The incubation period is 2-3 days, after which the fry may need up to a week to fully absorb the yolk sac. Start the fry on an infusoria-grade diet, moving on to microworm and Artemia nauplii once they are large enough to take them.
Common Challenges
Males are territorial toward each other, so a breeding setup must give enough space to avoid conflict. The reliance on live foods for both conditioning adults and feeding the very small fry is the main practical hurdle.