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Care guide · Freshwater · fish

Chalak barb

Dawkinsia chalakkudiensis

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The Chalak barb (Dawkinsia chalakkudiensis) is a large, active barb from Kerala in southern India. Older aquarium literature often calls it Sahyadria chalakkudiensis or Puntius chalakkudiensis. It is frequently confused with the Denison barb, but differs in features including an inferior mouth, a dark dorsal-fin mark and a duller red stripe. Seriously Fish reports about 12.5 cm standard length and calls for a base at least 120 × 45 cm, around 243 litres. The fish can be dominant and belligerent, so it is not a safe choice for an ordinary community aquarium. The fish is also sensitive to accumulating organic waste and needs routine maintenance. Do not buy juveniles without planning for the eventual space required by an adult group.

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At a glance

Temperature
15–25 °C
pH
6.5–7.5
GH
5–20 °dGH
Aquarium length
At least 120 cm
Minimum aquarium volume
At least 243 L
Adult size
Up to 12.5 cm
Group size
At least 5 individuals
Temperament
Aggressive

About this species

The species was described in 1999 as Puntius chalakkudiensis. Eschmeyer's Catalog of Fishes currently uses Dawkinsia chalakkudiensis, while the aquarium source Seriously Fish retains Sahyadria chalakkudiensis. These are combinations for the same species. Confusion with D. denisonii is not merely a naming issue: the fish differ visibly. D. chalakkudiensis has an inferior mouth, a dark mark in the dorsal fin and a duller red stripe that does not extend as far. Check those features when a trade identification is uncertain. The Catalog entry and the older profile name refer to the same described taxon; the genus change does not create a separate species. The species epithet refers to the Chalakudy River, its type locality.

Natural habitat

Dawkinsia chalakkudiensis is known from the Chalakudy, Periyar, Pamba and Achankovil river systems in Kerala, southern India. It is described from middle river reaches with rocky pools, sand, gravel or bedrock and dense riparian vegetation. This habitat supports an aquarium with oxygen-rich water, moderate flow and a substrate of rounded stones or fine gravel. Field records do not justify copying one exact river site. Clean water and adequate space matter more than décor that only resembles a stream. The specialist account also notes high oxygen needs and regular water changes because the fish is sensitive to pollution. Even in a naturalistic layout, maintain effective filtration and routine care. Current should circulate the aquarium without eliminating sheltered resting areas. After maintenance, check that all fish continue to swim and feed normally.

Aquarium and layout

Use at least the recommended 120 × 45 cm base and about 243 litres. Keep five or more conspecifics so the social hierarchy is not directed at one subordinate fish; the specialist source considers groups of two or three unsuitable. Set up a mature aquarium with long swimming lanes, rounded stones, sand or fine gravel and wood. Provide dependable filtration, high oxygen and moderate flow. The species can be intolerant and does not suit a small, crowded community tank.

Water conditions

The specialist source gives 15–25 °C, pH 6.5–7.5 and GH 5–20 dGH. No reliable KH range is established here. Treat these as reported aquarium limits rather than values to adjust constantly. Keep pH and water quality stable, limit organic pollution and maintain high oxygen availability. Test with appropriate kits and acclimate gradually. Do not choose tankmates solely because their water ranges overlap; behaviour and available space are critical for this barb.

Behaviour and group size

This barb is social but can be belligerent and dominant. The source recommends at least five conspecifics; in a small group, the hierarchy may lead to persistent harassment of weaker fish. Seriously Fish calls it unsuitable for a general community aquarium. If experienced keepers attempt companions, they should be robust and similarly sized, with ample room to retreat. No individually assessed pairings are linked here. Be prepared to separate fish if chasing, injuries or feeding exclusion occur.

Feeding

In the wild the species eats worms, insects, crustaceans, plant material and organic debris. In captivity, offer quality complete dry food as a staple and regularly vary it with suitable small portions of live or frozen foods such as Daphnia, Artemia or insect larvae. The specialist source recommends sinking foods. Distribute meals so subordinate fish can feed and remove leftovers. A single dry product or animal food alone does not provide a varied complete menu.

Breeding

The specialist source consulted records no established breeding account for this species. Seasonal spawning is only conjectured by comparison with a congener; it is not confirmed. There are therefore no reliable species-specific data here for spawning, eggs, incubation or fry care to present as a fixed protocol. Anyone attempting breeding should treat it as an uncertain specialist project and document results carefully, rather than presenting general methods for other barbs as proven for D. chalakkudiensis.

Sources & review

This care guide draws on several specialist sources and was last checked on .

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