All fish / Cyprinidae

Blackfin Rasbora

Rasbora atridorsalis

Also known as black-finned rasbora, blackfin rasbora, black fin rasbora, 黑背鲃, 黑鳍波鱼

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A slim silvery rasbora with a dark lateral stripe and a dark-tipped dorsal fin, which gives the species its name. It comes from clear, flowing hill streams and suits peaceful community tanks with gentle current and plenty of swimming space.

Care at a glance

Care level

Easy

Temperament

Peaceful

Adult size

7 cm

Temperature

20 to 26 °C

pH

6 to 7.5

Smallest tank

80 litres

Keep as

Shoal of 8 or more

Diet

Omnivore: quality flakes and small pellets, plus live or frozen bloodworm, daphnia and brine shrimp

Swims

Middle of the tank

Lifespan

4 to 6 years

Water

Freshwater

Wild range

Northern Laos and Yunnan, China (Mekong basin)

Breeding

It scatters its eggs among plants or over gravel and gives no parental care. Captive spawning has rarely been documented. Well-conditioned adults in a separate tank with fine-leaved plants may spawn, but the adults should then be removed.

Good to know

This fish is rarely sold and is sometimes confused with other striped Rasbora species. It prefers cooler, well-oxygenated water, so avoid very warm tanks.