
Source: Wikimedia Commons
Epalzeorhynchos frenatum
A bottom-dwelling cyprinid, grey-green to dark brown with red fins. Easier in a community than its congener the red-tailed black shark, though it too becomes territorial with age.
Epalzeorhynchos frenatum occurs in the Mekong, Chao Phraya, Xe Bang Fai and Mae Klong basins. FishBase records a maximum of 15cm TL, pH 6.0-8.0, 5-12 dH and 24-27C, finding it at mid-water and bottom depths near any solid surface over sand, moving into seasonally flooded habitats and feeding on algae, periphyton and phytoplankton. Seriously Fish gives 150mm SL, 20-26C, pH 6.5-8.0, 2-15 dGH and a 120 x 45cm base of about 243 litres, with a potential age beyond fifteen years. The body is grey-green to dark brown with red fins, and more intensely coloured forms are traded. It is a better community fish than the red-tailed black shark, but aggression towards similarly shaped fish still grows with age. The IUCN rates it Least Concern and it is not listed by CITES.
Source: Wikipedia (CC BY-SA 4.0)
The Rainbow Shark lives Over 15 years.
The Rainbow Shark grows to Up to 15cm TL.
The ideal temperature for the Rainbow Shark is 20〜26℃.
Origin
Southeast Asia (Mekong, Chao Phraya and Mae Klong basins)
Lifespan
Over 15 years
Size
Sources: FishBase / Seriously Fish
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Sources: CITES Appendices (species not listed) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
Up to 15cm TL
Temperature
20〜26℃
Sinking dried foods, frozen foods and vegetable matter
Seriously Fish suggests a 120 x 45cm base of about 243 litres. Sight-breaking driftwood and rock with several refuges reduce territorial friction. It works the bottom, so prioritise floor area.
Seriously Fish gives 20-26C, pH 6.5-8.0 and 2-15 dGH, while FishBase records pH 6.0-8.0, 5-12 dH and 24-27C. It prefers a mature, settled tank and dislikes abrupt changes.
A better community choice than the red-tailed black shark, though tank mates still need care. Grown fish harry similarly shaped species, so never keep it with its own kind or congeners. Loaches of Chromobotia, Botia, Syncrossus and Yasuhikotakia are usually left alone.
In the wild it eats algae, periphyton, phytoplankton and some zooplankton. Use a sinking dried food with plant content as the staple plus frozen bloodworm or Artemia. Its algae-grazing is limited.
Traded fish are produced on Southeast Asian farms with hormone induction. Adults fight hard, so home breeding is almost unreported.
It can live beyond fifteen years, so plan long term, and remember that a shy, docile juvenile is no guide to the adult temperament. An albino strain is also traded. The IUCN rates it Least Concern and it is not listed by CITES.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Rainbow Shark is 20〜26℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Rainbow Shark is Over 15 years. With proper care and nutrition, they can live a long and healthy life.
Rainbow Shark typically reaches Up to 15cm TL as an adult. Size may vary depending on care conditions and individual genetics.
Rainbow Shark feeds on: Sinking dried foods, frozen foods and vegetable matter. Aim for a balanced diet with appropriate feeding frequency.
The price of Rainbow Shark varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 16, 2026