Max Size: 6.5cm

Laos Danio (Devario Laoensis)

Laos Danios are peaceful, reasonably hardy and active, making them suitable for beginner hobbyists and an excellent addition to a spacious, peaceful community aquarium.

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

The aquarium should have a reasonable flow rate and be well-oxygenated as these fish will enjoy swimming against the current, like most Danio species. Since these Danios naturally occur in pristine habitats, they are intolerant to the buildup of extreme organic pollutants. Therefore these fish require good water conditions to thrive, and you should never introduce them into a biologically immature aquarium. The aquarium will need a tight-fitting cover as Laos Danios have periods of skittish behaviour and are inclined to leaping out of the aquarium.

Unfortunately, there is little to no information on how to care for these fish in captivity; however, they shouldn't be too difficult to keep in a well-maintained setup like other Danio species.

Laos Danios are likely to thrive in an aquarium setting resembling a flowing river or stream with a substrate of differently-sized smooth rocks, some sand or fine gravel and maybe some smallish stones. You can also add driftwood roots or branches and hardy aquatic plants like Anubias, Microsorum and Bolbitis.

Laos Danios have a silvery bronze body that displays a dark, lateral stripe on their mid-body that is relatively faint, extending through the body, becoming thicker and darker on the posterior part of the body and ending at the caudal fin. The dark lateral stripe also has two broken orange lines within it. In addition, these fish also have a central bar on their anal fin and a submarginal stripe on their dorsal fin.

Quick Facts
Scientific NameDevario Laoensis
Other NamesNone
OriginsLaos, Thailand
Aquarium LevelMiddle - Top
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan4 - 8 years
Water Parameters
Water TypeFreshwater
PH6.0 - 7.5
GH5 - 12
TDS18 - 179
73 - 79℉
22.8 - 26.1℃

Photos of the Laos Danio

Laos Danio
Laos Danio

Natural Habitat

Laos Danios are endemic to Ban Nam Khueng, which lies within northwestern Laos. However, these Danios have also been recorded in several localities within the upper Mekong watershed in Thailand and Laos in Southeast Asia.

These fish inhabit streams and rivers situated at relatively high altitudes and receive a great deal of rainfall between May and October. Consequently, the habitats of these fish are likely to be limited to hill streams and small rivers with substrates of gravel and different sized rocks. These areas also contain minimal over-hanging vegetation, and the water flow is constantly changing depending on the time of year.

What to feed the Laos Danio

Laos Danios mainly feed on insects and their larvae in the wild. However, in the aquarium, they are unfussy feeders and will accept most foods.

It would be best if you provide your fish with a good quality dried product as the staple diet; however, you should supplement this with regular meals of live, frozen or freeze-dried foods. These can include daphnia, bloodworm and brine shrimp for the best colouration and conditioning of your fish.

How to sex the Laos Danio

It can be somewhat challenging to distinguish the males from the female Laos Danios. Sexually mature females are usually rounder-bellied, less colourful and a little larger than males. Also, When in breeding conditions, the dominant males lower half of the body becomes bright orange.

How to breed the Laos Danio

Again, Unfortunately, there is no information on how to breed these fish or any records of the successful breeding of these fish; however, we can presume that they would produce similarly to other Davario species.

When Laos Danios are in a well-planted, established aquarium and are in tip-top condition, small numbers of fry may start to appear without any intervention. However, if you would like to increase the yield, a more controlled approach will be required.

You can still condition the group together, but you will need to set up a smaller aquarium filled with mature water. It would be best if you dimly lighted the aquarium and had the bottom covered with some mesh with big enough holes so that the eggs can drop through but small enough holes so that the adults can't get through.

Plastic grass matting or marbles can also be used as an alternative and works well. Finally, supplying fine-leaved plants such as java moss or spawning mops can again return satisfactory results.

The water will need to be slightly acidic to neutral, and you should raise the temperature by a few degrees. A small air-powered sponge filter or air stone is also recommended to provide water movement and oxygenation.

Once the adults are well-conditioned and the females appear to be full of eggs, you should then introduce one or two pairs into the breeding tank.

Spawning usually takes place within 24 hours, where the female will suddenly appear noticeably slimmer, then 48 hours later, you should remove the adults.

The incubation period is temperature-dependent to an extent but typically lasts around 24 to 36 hours. The fry will then become free-swimming a few days after that.

Initially, it would be best to feed the fry on Paramecium or similar and then introduce artemia nauplii, microworm, dry food or powdered foods once the fry is large enough to accept them.

Other Danios of interest

Assam Danio(Devario assamensis)
Barred Danio(Devario pathirana)
Bengal Danio(Devario devario)
Black Barred Danio(Danio absconditus)
Blood Tailed Danio(Devario annandalei)
Blue Danio(Danio kerri)
View all Danios
Date Added: 18/10/2021 11:09:18 - Updated: 05/01/2022 16:55:54