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Small schooling fish from Southeast Asia. Espei and harlequin rasbora most popular. Perfect for planted tanks.
Rasboras are a group of small cyprinid fish native to freshwater habitats of South Asia, Southeast Asia, and southern China, encompassing dozens of species. The harlequin rasbora (Trigonostigma heteromorpha) is the most widely kept, recognized by its copper-orange body and bold black triangular patch. Most species remain under 10 cm and are naturally schooling fish that display their finest behavior in groups of ten or more. Adaptable to slightly acidic to neutral water (pH 5.5–7.5) at 22–28°C, they are among the more forgiving community fish. Their peaceful temperament makes them compatible with virtually all small tropical fish, and they are a staple of the community aquarium. Body colors pop against dark substrates, driftwood, and lush plantings, making rasboras ideal for planted tanks. They feed readily on fine granules, flake food, and small frozen foods such as daphnia. Breeding involves scattering eggs on the undersides of broad plant leaves in soft, acidic water. Taxonomy within this group is actively evolving, with many species recently reclassified into the genus Danio or related genera.
Source: Wikipedia (CC BY-SA 4.0)
Origin
freshwater habitats in South and Southeast Asia, as well as southeast China
Lifespan
3-5 years
Size
2-5cm
Temperature
22〜28℃
Pellets, frozen food
Sources: Seriously Fish
Edited & verified by: br-choku editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Primary sources
「ラスボラ」は総称。代表種で確認。該当する複数属(Trigonostigma/Rasbora/Boraras)に CITES 掲載種なし。
Sources: Seriously Fish / CITES Appendices (Checklist)
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
45cm+ for schooling
10+ for beautiful schooling display
Soft, slightly acidic water best
24-28°C
Small size — avoid keeping with large fish
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Rasbora is 22〜28℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Rasbora is 3-5 years. With proper care and nutrition, they can live a long and healthy life.
Rasbora typically reaches 2-5cm as an adult. Size may vary depending on care conditions and individual genetics.
Rasbora feeds on: Pellets, frozen food. Aim for a balanced diet with appropriate feeding frequency.
The price of Rasbora varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: June 23, 2026