Rasbora
A diverse genus of small freshwater fish native to South and Southeast Asia.
Rasbora is a large group of small cyprinid fishes found in rivers across southern and eastern Asia. Many species are popular in home aquariums due to their peaceful nature and distinct markings. Taxonomic studies show the group contains many closely related genera that were once classified together.
- Most species stay under 10 cm in length.
- Native to freshwater habitats in South and Southeast Asia.
- Taxonomy revised in 2007 showing non-monophyletic origins.
- Popular choice for home aquarium enthusiasts.
- Maximum recorded length reaches 17 cm.
What it is
Rasbora represents a substantial collection of small freshwater fishes belonging to the family Danionidae. These animals typically display slender bodies with a prominent dark horizontal stripe running along their sides. While most individuals remain under ten centimetres in length, the largest recorded specimens reach seventeen centimetres. The common name applies broadly to this genus and several other related groups previously grouped within it. Their physical appearance varies by species but generally suits life in clear, flowing waters.
Where it lives
These fish inhabit river systems throughout South Asia and Southeast Asia. Their natural distribution extends into the southeastern regions of China. One historical record suggested a presence in Cameroon, Africa, based on an old specimen. Experts now consider that African location doubtful and likely incorrect. The primary range remains firmly within the Asian continent's tropical and subtropical zones.
How it lives
Members of this genus live in freshwater environments, often in rivers and streams. They are frequently kept in home aquariums because they are hardy and visually striking. Many species exhibit schooling behaviour, moving together in groups. Predators in their natural habitat include larger fish and birds. The taxonomic history is complex; a 2007 analysis revealed the genus was not monophyletic, meaning it did not share a single unique ancestor without excluding some relatives.
Breeding and life cycle
Specific spawning details vary significantly among the numerous species listed. Some species have been described relatively recently, indicating ongoing scientific discovery. Eggs are laid in freshwater habitats typical for cyprinids. Juvenile growth rates differ by species and environmental conditions. Detailed reproductive cycles for individual species are not universally documented in general summaries.
Fish and people
Aquarium hobbyists regularly keep many Rasbora species due to their attractive colours and manageable size. They are considered suitable for community tanks. The name is also used for several related genera like Boraras and Trigonostigma, which share similar traits. This broad usage can cause confusion in trade and identification. No significant food or medicinal uses are highlighted in standard references.
Status and threats
Conservation status varies by individual species and is not uniformly assessed for the entire genus. Some species have restricted ranges and may face threats from habitat loss. Overfishing for the aquarium trade could impact certain populations. Data deficiency exists for many newly described or rare species. Protection efforts depend on local regulations in their native countries.
Questions people ask about Rasbora
What kind of fish is a rasbora?
It is a genus of small freshwater fish in the family Danionidae. They are native to Asia and are known for their slender bodies and horizontal stripes. Most species are under ten centimetres long.
Are rasboras good for aquariums?
Yes, many species are regularly kept in home aquariums. They are valued for their peaceful nature and distinct markings. They thrive in community tanks with similar-sized fish.
Where do rasboras live naturally?
They are found in freshwater rivers across South and Southeast Asia, including parts of southeast China. A doubtful record exists for Cameroon, but this is not accepted as valid.
How big do rasboras get?
Most species do not surpass ten centimetres. However, the largest species can reach up to seventeen centimetres in length. Size varies significantly between different species in the genus.
Good reading and sources
The facts on this page come from the Wikipedia article "Rasbora", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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