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FRESH WATER

Fishes

Harlequin rasbora
(Trigonostigma heteromorpha)

francais anglais
Harlequin rasbora

Harlequin rasbora
(Trigonostigma heteromorpha)

This beautiful Asian fish will gently animate your aquarium all day. Its beautiful colour will highlight its environment, so this little fish does not lack charm!

Discover in this sheet how to offer your Harlequin Rasbora a pleasing lifestyle!

Scientific name

Trigonostigma heteromorpha
Rasbora heteromorpha

Common name

Harlequin rasbora
Harlequin fish

Origin

what are its countries of origin?

Origin: Malaysia, Thailand, Indonesia
Biotope: Asian

Dimorphism

what are the physical differences between males and females?

The male is slenderer. The female is slightly larger and its abdomen is more bounced

Group

Group

Cyprinidae

Volume

what is the minimum volume for this species?

100 L / 22 imp gal / 26 US gal

Water parameters

what are the water parameters for the maintenance of this fish?

T°: 24 à 28°C or 75 to 82°F
pH: 6 to 6.5
Hardness: 1 to 5°dGH

Difficulty

Difficulty

Easy

Size

what is the maximum size of this fish?

3 to 5cm (1.2 to 2")

Life expectancy

what is the average life expectancy of this fish?

3 to 6 years

Living zone

in which area of the aquarium does this fish live?

Middle

Individuals

sociability of the species

12

Food

How to feed the Harlequin rasbora?

Food

How to feed the Harlequin rasbora?

Omnivorous: all forms of food are accepted. However, to enhance their colour, regularly offer them live or frozen food such as daphnids, bloodworms or brine shrimp.

Behavior

What kind of behavior does the Harlequin rasbora have?

Behavior

What kind of behavior does the Harlequin rasbora have?

The Harlequin Rasbora is peaceful, calm and gregarious. It must imperatively be maintained in groups (10 to 12 individuals minimum). Nevertheless, this group will not form a shoal strictly speaking (like that of the Neons for example).

group of Trigonostigma heteromorpha
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Cohabitation

Who can live with the Harlequin rasbora?

Cohabitation

Who can live with the Harlequin rasbora?

This species is a very good choice for a community aquarium (independent, it does not care about the other inhabitants). In addition, its wide tolerance with the parameters of its water allows the association with many species. If you want to make an Asian biotope, you can make it cohabit with species of the genus Osphronemidae (colisa and gourami) or other small Cyprinidae (bearded).

In a general aquarium, the Harlequin Rasbora can easily live with dwarf cichlids, catfish, loaches and many others, provided the water parameters are consistent.

Breeding

How to breed the Harlequin rasbora?

Breeding

How to breed the Harlequin rasbora?

Breeding in captivity is possible. It will be in groups (2 males for 1 female) or in pairs but only individuals over one year will breed. Prepare your spawning tank (15 L / 3.3 Imp Gal / 4 US Gal or more) with a protective grid and large-leaved plants (Cryptocorynes or Microsorium for example).

Temperature 26/28°C or 79/82°F, pH between 5.8 and 6.4 and very soft water (less than 5°f). The quality of the water must be irreproachable. You can separate the sexes 15 days before spawning and condition them (live food 2 to 3 times a day). Introduce the selected individuals into the breeding tank. A change of water with cooler water encourages spawning.

The females stick the eggs under the leaves, and the males fertilise them afterwards. It is interesting to watch these fish turn around completely for spawning. The couple/group will stay 3 to 4 days in the spawning tank, but if no eggs are observed, it will be necessary to try with other individuals. On the other hand, if you notice the presence of eggs, remove the parents and place the egg tray in the dark. The incubation lasts 24h at 28°C or 82°F. After hatching, the fry remain sensitive to light for the first few weeks.

Fry food: nauplies of artemia and cyclops.

Its aquarium

Which aquarium for the Harlequin rasbora?

Its aquarium

Which aquarium for the Harlequin rasbora?

This species likes dark substrates and dense vegetation (Anubia, Cryptocoryne, Microsorum, Taxiphyllum or Echinodorus). Also introduce some floating plants that will sift the lighting.

Harlequin Rasbora will be perfectly at home in a 100% Asian biotope. For a more natural effect, assemble your branches so that they form many paths and hiding places.

Do not hesitate to add also dried oak or beech leaves, or even ketapang almonds. These elements will make a good microbial support, will enrich the chemistry of the water and will disturb it somewhat (the colour of the water turns brown). These leaves must be replaced before they rot.

Good to know

Good to know

Find all additional information!

Harlequin Rasbora is particularly susceptible to velvet disease (Oodinium). There are selected black, purple, blue and golden varieties of this species.

Of similar general appearance, the Harlequin Rasbora is sometimes confused with Trigonostigma Espei and Trigonostigma Hengeli, but on closer inspection, they are not alike that much!

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