Denison barb
Dawkinsia denisonii
The Denison barb (Dawkinsia denisonii), often called Sahyadria denisonii in older literature, is a large, active shoaling fish from southern India. Its red stripe runs above a dark lateral band. Seriously Fish reports about 11 cm standard length and recommends a base of at least 120 × 45 cm, around 243 litres. Keep a group and provide ample swimming room, oxygen and clean water. This species is not suited to a small community aquarium, even though it is generally peaceful. It is a powerful swimmer and does best in a mature, spacious setup with long open lanes. A shoal also needs varied, balanced feeding. Plan around adult size from the outset rather than the smaller juveniles commonly seen in shops.
Plan your aquarium →At a glance
- Temperature
- 15–25 °C
- pH
- 6.5–7.8
- GH
- 5–25 °dGH
- Aquarium length
- At least 120 cm
- Minimum aquarium volume
- At least 243 L
- Adult size
- Up to 11 cm
- Group size
- At least 6–10 individuals
- Temperament
- Peaceful
About this species
The species was described as Labeo denisonii in 1865. Eschmeyer's Catalog of Fishes currently uses Dawkinsia denisonii, while the specialist aquarium profile Seriously Fish retains Sahyadria denisonii and was last revised in 2015. Puntius denisonii also appears in older literature. These are combinations for the same species, not separate aquarium forms. The red stripe and dark lateral band are characteristic. Confusion with the close relative D. chalakkudiensis is possible; that species may behave differently.Natural habitat
Dawkinsia denisonii is endemic to Kerala and Karnataka in southern India. It inhabits clear, fast-flowing hill streams and rocky pools with high oxygen levels and riparian vegetation. Its range is now fragmented. This setting explains the importance of clean water, good aeration and moderate flow in captivity. There is no need to reproduce one exact stream: prioritize stable water quality, open swimming space and sheltered margins.Aquarium and layout
Follow the generous recommendation of a base at least 120 × 45 cm and about 243 litres. This gives an active adult shoal room to swim; a smaller tank does not become suitable merely by adding a more powerful filter. Use dependable filtration, good surface movement and high oxygen availability. Keep long swimming lanes open and place plants, wood or stones mainly around the edges. Keep organic waste low and maintain the aquarium regularly.Water conditions
The specialist profile gives 15–25 °C, pH 6.5–7.8 and GH 5–25 dGH. These are broad reported aquarium ranges, not targets to adjust constantly. Stability, clean conditions and ample oxygen matter most. Check water with reliable tests and acclimate new fish gradually. Choose tankmates that tolerate the same temperature long-term; an overlapping pH range alone does not establish compatibility.Behaviour and group size
The Denison barb is generally peaceful but very active and relatively large. Keep a shoal of at least six; ten may be appropriate when aquarium space and filtration are generous. Choose robust companions of similar size that can share the swimming space and temperature. Small, shy or slow-feeding fish may be harassed or outcompeted at meals. No individually checked pairings are linked here, so no species is presented as guaranteed compatible.Feeding
The species is described as herbivorous in the wild, although other specialist accounts also mention small animal prey. Offer varied complete food with plant ingredients as the staple, supplemented with suitable small frozen or live foods such as Daphnia or Artemia. Sinking foods can help when fish near the surface take food first. Distribute small portions so the whole shoal can feed and remove leftovers to protect water quality.Breeding
Commercial captive production is reported, but detailed, reliable home-breeding protocols for this species are limited. Related cyprinids often scatter eggs without parental care, but that does not justify exact claims about triggers, egg numbers, hatch times or fry care for D. denisonii. Treat breeding as a specialist project and use species-specific literature for procedures. Adults may eat eggs; raise fry only when appropriately fine food and stable water quality are available.Suitable products
Recommended staple foods
Tropical Supervit Basic 100ml
Complete staple food with plant ingredients for a varied omnivorous diet.
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Tropical Dafnia 100ml
Daphnia as a supplementary small animal food alongside a complete staple.
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Sources & review
This care guide draws on several specialist sources and was last checked on .