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Trigonostigma heteromorpha - Harlequin rasbora


  • Trigonostigma heteromorpha - Harlequin rasbora

    Photo thanks to Watfish

    Scientific name: Trigonostigma heteromorpha
    Common name: Harlequin rasbora
    AKA: Harlequin tetra/ Rasbora heteromorpha

    Country of origin: South-East Asia

    pH: 5.0 - 7.5
    Temperature: 21 - 28c
    Hardness: 18 - 215ppm
    Water flow: low - standard
    Oxygenation: standard

    Maximum size: 5cm

    Diet: Live, frozen, flake & pellet foods.

    Breeding: Males have a larger black body patch than females. Breeds at 28c in soft acidic water.
    Pairs spawn on the underside of leaves, crypts are ideal. The eggs stick to the leaves.
    Remove the parents once they have spawned to prevent predation on eggs & fry.
    Feed fry on infusoria, then BBS.

    Tank companions: It lives in a similar habitat to South American fish, and goes well with other peaceful tetras, cardinals, corydoras, even discus.

    It is a shoaling fish, and should be in a group of 6 or more.

    Photo thans to Bardus71, of his Walstad tank

    DSC_0383 by enigma--, on Flickr
    Photo thanks to Enigma

    It is often confused with:
    Trigonostigma heteromorpha - copper with black triangle
    Trigonostigma hengeli - clearer fish, copper above & below black lambchop mark
    Trigonostigma espei - copper with black lambchop mark
    Trigonostigma somphongsi - the black is a thin stripe only. Extremely rare in the trade.

    Trigonostigma heteromorpha are legal imports to Australia as of 20/10/2013:
    however, as Australian natives, they can legally be purchased from Australian stock.

    The IUCN Red List reports Trigonostigma heteromorpha as a species of least concern, with a stable population at 20/10/2013:

    It is very important not to release any aquarium specimens into our waterways. Any that are not sold or re-homed/ given away, can often be re-sold to aquarium stores. If they are homed in ponds, care should be taken that they cannot escape in run-off into our waterways. Even if fish are native & local they should not be moved from one waterway to another, as this can transfer disease. If they are not local fish, they can both spread disease and either out-compete or eat local fish, shrimp & plants, causing their demise.

    It is a good fish for beginners.

    • DiscusEden
      DiscusEden commented
      Editing a comment
      There are aquarium bred variants:
      blue - indefined blue/ black over the back half of the fish
      black - undefined black over the majority of the fish's side
      golden (leucistic) - does not have the black mark

      Photo thanks to greenfinger - black harlequin

      Photo thanks to Greenfinger - black harlequin

      Photo thanks to briztoon - standard

    • d_golem
      d_golem commented
      Editing a comment
      A more suitable common name is Harlequin rasbora, as "tetra" is used for describing the South-American & African characins.

    • DiscusEden
      DiscusEden commented
      Editing a comment
      Thankyou for clarification - article adjusted.
    Posting comments is disabled.



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