Trigonopoma gracile (Kottelat 1991)

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Slender Rasbora gracilis

Trigonopoma gracile is one of two Trigonopoma species found in Indonesia and Malaysia, Trigonopoma gracile can be found in peat swamps and forest streams of Borneo, Sumatra and Malay Peninsular, known to grow between 4.5-5.5.0cm.

Submitted by
Andre Chandra
0.2781000, 109.0746994
Geographical region
Southeastern Asia
Drainage Basin
Kapuas River
River catchment
Kapuas River
Water body type
Water body name
Sungai Pinyuh
Water body part
Water body course
Water body: tributary of
Tributary name
Type locality
Sungei Kepayung, 7 kilometers southeast of Anjungan on road to Pontianak, 0°20'N, 109°08'E, Kalimantan Barat, Borneo, Indonesia.
Conservation status/IUCN Red List
Not Evaluated (NE)

Water Chemistry

Water information

Water type
Fresh water
Water color
Black water
Water transparency
Concentration of sediments
Water temperature
25-27 °C
Water flow/curent

Chemical parameters

Dissolved Oxygen


Standard length
4.0 cm
Water volume (min. aquarium)
120 l
Social behaviour
Group fish
Behaviour description

An active mid-water dwelling fish and also a good addition to a peaceful community of Southeast Asian fishes with comparably-sized cyprinids, small loaches, and certain anabantoids.

A schooling species by Nature and the purchase of at least 10 specimens is recommended. By maintaining it in larger numbers will not only make the fish less nervous but will result in a more effective, natural-looking display.

Males will also display their colours as they compete with one other for female attention.

This fish is easy to care for – they prefer a slightly acidic water and best thrive with lower PH, can also be kept in densely planted aquarium as they appreciate vegetations for hiding or cover, water temperature can be kept between 25-27°C.

Aggression grade
Day active
Sexual dimorphism

Trigonopoma gracile female will have rounder belly while male exhibit a great colouration and have slimmer body.

Nutrition in Nature

In its natiral biotope the Slender Rasbora gracilis feeds on zooplankton, worms and small crustaceans.


Breeding tank set-up

A tank of at least 30x20cm in size, media such as moss, dried cattapa leafs and also mesh for aquarium base, prepare 3 females and 2 males.

Nutrition parents

Life foods such as tubifex worms, daphnia and brine shrimp.

Mating type
Spawning behaviour

Like most small cyprinids Trigonopoma gracile are egg-scattering free spawners exhibiting no parental care. When in good condition they will spawn often and in a mature aquarium it’s possible that small numbers of fry may start to appear without intervention.

However for maximum yield a tighter approach is needed.

Breeding habits
Egg scatterer
Hatching period
Number of eggs in average
Parental care
Fry number
Nutrition fry

The infusoria for 10 days then brine shrimp after 10 days.

Notes on reproduction