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Queen Danio Fact Sheet

The Queen Danio, Devario regina, is a reasonably peaceful but extremely active little fish, growing up to about 10 cm (4 inches) long.


The Queen Danio is native to India, Myanmar, Thailand and Malaysia.  Its habitat is mountain streams where the water tends to be very well oxygenated.

Water Conditions

In the wild this fish comes from fast flowing well oxygenated steams often with a sandy bottom and not very many plants.

In an aquarium it needs plenty of space and is suitable for aquariums at least 90 cm (3 feet) long to accommodate its fast swimming and lively nature.  The tank water should be clean and well oxygenated.  This fish does better with a strong current in the aquarium.

It is a tropical fish and a temperature of between 21 and 26 degrees C (between 70 and 79 degrees F) is suitable although it will survive a little outside this range.  In the wild it is usually found in soft, slightly acidic water, but seems to have no trouble in adapting to neutral or slightly alkaline water with up to 15 degrees of hardness.  A ph of 6.0-7.5 is suggested.

Although in the wild it is frequently found in places without many plants, in captivity it does well in well planted tanks with adequate space for swimming.


This is a very easily fed omnivore which takes all common aquarium food of the right size readily.  I make sure that my Queen Danios have a varied diet including live food like Daphnia and frozen food including Bloodworms and Brine shrimp.


The Queen Danio is a schooling fish which should be kept in groups of at least 4.  It is a peaceful community fish, but its boisterous nature makes it an unsuitable tank mate for slow moving fish like guppies, Siamese Fighting Fish and Discus.  I would also avoid putting very small fish with it, but it can be kept with a wide variety of the larger tetras (but not the Vampire Tetra), danios, barbs, rainbow fish, etc.  Naturally, do not put it with large aggressive fish.


The female Queen Danio tends to be noticeable plumper than the male.


This is an easily bred egg scattering species.  It is one of the species that often lay eggs in a community aquarium without their owner being aware of it.  Of course the eggs or very young babies get eaten very quickly.   In the wild they are believed to spawn in schools rather than pairs, but in captivity they can be spawned either in pairs or in schools.  The fish should be well conditioned first, but this is easy because the Queen Danio is such an easily fed fish.

To stimulate breeding in the breeding tank, increase the temperature a couple of degrees.  They are most likely to spawn in the early morning.  These fish are avid egg eaters and need to be removed after spawning.

Raising the Babies

The first food, once they are free swimming, needs to be the mixture of microscopic organisms generally called infusoria.  As they get bigger, they will be able to eat things like newly hatched brine shrimp or screened Daphnia.  They will grow quickly if they have plenty of live food.


Devario regina usually known as either the Queen Danio, or Fowler’s Danio in English.  Its scientific name is now Devario regina (Fowler, 1934).  Previously it was known as Danio regina (Fowler, 1934).

Conservation Status

This species is listed as being of least concern.  It is not one of the more common Danios in aquarium shops, but its relatively low price when it is available suggests that it is not rare.  It is reported as being a common fish in Thailand.

Pest Fish

Although I do not know of any cases of the fish getting into ecosystems it is not native to, I can imagine that it could easily cause problems if someone carelessly or maliciously introduced it into local waterways.

Queen Danios with Croaking Gouramis and Pristella Tetras Eating Frozen Blood Worms