Max Size: up to 6 cm

Fireline Danio (Devario sondhii)

The Fireline Danio is a comparatively new species in the aquarium hobby. These Danios are peaceful, reasonably hardy and active, making them suitable for the beginner aquarist and an excellent addition to a spacious, peaceful community aquarium.

Fireline Danios are a shoaling species in nature; therefore, it would be better to maintain them in groups of six individuals, preferably more if possible. Suitable tankmates for these Danios could include other small Cyprinids, Danios, most livebearers, Rasboras, Tetras, bottom-dwellers such as Loaches and Catfish, Gobies, and Dwarf shrimp. You can also keep these Danios with the most commonly available Dwarf Cichlids and Gouramis. However, tiny species, slow-moving fish or fish with intricate finnage are not recommended.

The aquarium should be well oxygenated, well-filtered and have a reasonable flow rate as these fish will enjoy swimming against the current. In addition, the aquarium's back and sides need to be well planted, leaving a decent sized open swimming space in the centre.

Since these Danios naturally occur in pristine habitats, they are intolerant to the buildup of organic pollutants. Therefore these fish require spotless water to thrive, and you should never introduce them into a biologically immature aquarium. Performing weekly water changes is a must, and the aquarium will need to have a tight-fitting lid as these Danios can have bouts of skittish behaviour and quickly jump out of the aquarium.

Fireline Danios can differ in colouration depending on their mood and condition. However, these Danios usually have a dark, lateral stripe on the body, extending into the caudal fin and possess a prominent cleithral spot just behind the gill cover. The top and front half of this fish is a silvery colour, contrasted with a reddish-orange colouration on the lower back half of the body. All their fins are transparent except the caudal fin that has some orange shading.

Quick Facts
Scientific NameDevario sondhii
Other NamesBurmese Gold Line Rose Danio
OriginsSoutheast Asia
Aquarium LevelMiddle - Top
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan5 - 8 years
Water Parameters
Water TypeFreshwater
Temperature68 - 79 ℉ (20 - 26.1 ℃)
PH6.5 - 7.5
GH5 - 12
TDS18 - 90
Fireline Danio


Fireline Danios are native to the Southern Shan State Myanmar and the Salween Basin in Southeast Asia. They inhabit shallow, transparent water in wetlands and ponds that are rich in plant life and contain dense vegetation.

Other Danios of interest

Bengal Danio(Devario devario)
Celestial Pearl Danio(Danio margaritatus)
Emerald Dwarf Danio(Danio erythromicron)
Giant Danio(Devario aequipinnatus)
Glowlight Danio(Celestichthys choprae)
Lake Inle Danio(Devario auropurpureus, Inlecypris auropurpurea, Barilius auropurpureus)
View All Danios

Diet & Feeding

In the aquarium, Fireline Danios are not fussy eaters and will accept most foods. Therefore, you should use high-quality dried products such as flakes, granules, or pellets as the staple diet. However, it would be best if you extend this with frequent meals of small live and frozen food such as daphnia, bloodworm, and artemia, resulting in the best colours and condition of your fish.

Sexual Dimorphism

It is pretty straightforward to distinguish a male from a female Fireline Danio. Males tend to be more petite, more slender, and more vibrantly coloured than females. In contrast, sexually mature females will be rounder-bellied, duller and a little larger than males.


Like most small Cyprinids, Fireline Danios are egg-scattering free spawners that exhibit no parental care. However, when in good condition, these Danios will often spawn, and in a well-planted, established aquarium, small numbers of babies may start to appear without interference. However, if you want to maximise the yield, a more controlled plan will be required.

You can still condition the adult group together, but you will need to set up a separate breeding tank and fill it with mature water. The breeding tank will need to have a mesh or some pebbles on the bottom, enabling eggs to fall through. First, however, you need to make sure the adults cannot reach them.

Plastic grass type matting can also be used and works well, so does a layer of glass marbles. Alternatively, you can fill up much of the tank with fine-leaved plants or spawning mops because these also return decent results.

The water should have a slightly acidic to neutral pH, and the temperature needs to be somewhat higher than their usual aquarium. You should also include an air-powered sponge filter or an air stone to provide water movement and oxygenation.

Once the adults have been well-conditioned with live and frozen food and the females are noticeably full of eggs, you should introduce one or two pairs into the breeding tank. If the fish are ready, spawning will usually occur within 24 hours, and after 48 hours, you should remove the adults.

The incubation period is temperature-dependent but typically lasts 24 to 36 hours, with the young becoming free-swimming a few days after that.

Initial food should be infusoria or Paramecium, introducing Artemia nauplii, microworm and powdered dry foods once the fry is large enough to accept them.

You may enjoy the following profiles

Porthole Rasbora(Rasbora cephalotaenia)
Zebra Pleco(Hypancistrus zebra)
Black Widow Tetra(Gymnocorymbus ternetzi)
Delphax Corydoras(Corydoras Delphax)
Neon Tetra(Paracheirodon innesi)
Glowlight Rasbora(Trigonostigma hengeli)
View More Species
Date Added: 16/07/2021 13:07:38 - Updated: 16/07/2021 16:38:57