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Care guide · Freshwater · fish

Malabar devario

Devario malabaricus

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The Malabar devario (Devario malabaricus), often sold as “giant danio”, is a large and active shoaling fish from peninsular India. Seriously Fish gives about 8 cm standard length and recommends an aquarium around 120 cm long and 243 litres. Despite its peaceful nature, constant activity and vigorous feeding can disturb timid, slow or small fish. Keep at least eight to ten in a spacious, well-maintained aquarium with extensive swimming room and a securely fitted lid. Older trade names often confuse this species with D. aequipinnatus.

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At a glance

Temperature
18–25 °C
pH
6.0–8.0
GH
2–15 °dGH
Aquarium length
At least 120 cm
Minimum aquarium volume
At least 243 L
Adult size
Up to 8 cm
Group size
At least 8–10 individuals
Temperament
Peaceful

About this species

The accepted name is Devario malabaricus (Jerdon, 1849). Older combinations include Danio malabaricus and Perilampus malabaricus. FishBase reports 12 cm maximum total length and 8 cm common total length, while Seriously Fish gives 80 mm standard length. Since SL and TL are different measurements, this guide uses the aquarium profile’s value and keeps FishBase records as a separate convention. The species has a blue-and-yellow pattern and a pigment stripe extending to the fork of the caudal fin.

Natural habitat

The species occurs on peninsular India and Sri Lanka, although its true range may be narrower, perhaps western-flowing drainages or Kerala. It inhabits hill streams and upper small rivers with clear, oxygenated water, gravel and rocks, and marginal vegetation. Flow, volume and turbidity vary seasonally; some populations persist through dry periods in remnant pools. This supports clean water but not one constant high flow rate.

Aquarium and layout

For long-term care Seriously Fish recommends a base of 120 × 45 cm and about 243 litres. This large shoaler needs a long open swimming zone. Use rocks, gravel and wood; hardy plants such as Microsorum can be attached to décor without filling the open area. Provide high oxygen and moderate movement. Weekly water changes of about 30–50% are described as routine. Secure the lid tightly because Devario jump powerfully.

Water conditions

The care range is 18–25°C, pH 6.0–8.0 and GH 2–15 dGH. Keep the water stable, clean and oxygen-rich; the species is described as likely intolerant of accumulated organic pollution. Perform regular substantial water changes and maintain the filter appropriately. Broad tolerance does not make rapid swings safe. Adjust conditions gradually if the fish arrive from different water.

Behaviour and group size

Malabar devarios are not aggressive, but they swim constantly and feed vigorously. This can disturb slow or timid tankmates. Keep at least eight to ten and choose robust fish of similar size and activity. Small fish may become prey. After introduction, check that all inhabitants can feed and have places to rest. A shoal in an undersized aquarium cannot be “fixed” by adding more filtration.

Feeding

In nature the species is thought to eat mainly insects and larvae. In aquaria it is not selective. Use a quality complete dry food as the staple and regularly supplement with small portions of live or frozen foods such as Daphnia, Artemia and bloodworm. Feed enough for the group without leaving excess. Ensure food does not reach only the fastest dominant fish.

Breeding

The species scatters eggs and provides no parental care. Well-conditioned fish may spawn often; a few fry may appear in a mature planted aquarium, but adults eat eggs. For controlled breeding, Seriously Fish describes a separate dimly lit tank at least 60 × 30 cm with mesh or fine-leaved plants. Remove the adults after spawning. Fry need suitably fine first foods; success is not guaranteed.

Sources & review

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

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