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Care guide · Freshwater · fish

Golden dwarf barb

Pethia gelius

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The golden dwarf barb (Pethia gelius) is a small, peaceful but shy South Asian species. It usually remains around 4 cm standard length and depends especially on a mature, stable aquarium; water-chemistry swings and feeding competition can cause problems. Seriously Fish recommends a minimum 60 × 30 cm base, about 54 litres, and a shoal of eight to ten. Choose calm, diminutive companions and allow the fish to feed without disturbance after introduction. A mature aquarium, suitably small prey and a calm shoal setup matter more than a vivid golden colour. Check daily that every fish is feeding.

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At a glance

Temperature
18–24 °C
pH
6.0–7.0
GH
1–10 °dGH
Aquarium length
At least 60 cm
Minimum aquarium volume
At least 54 L
Adult size
Up to 4 cm
Group size
At least 8–10 individuals
Temperament
Peaceful

About this species

The accepted name is Pethia gelius (Hamilton, 1822); Cyprinus gelius and Puntius gelius are earlier combinations. The species is usually pale golden-yellow with several diffuse dark body blotches. Females are often rounder and slightly larger, while males are more intensely coloured. Confusion with Pethia canius and P. aurea matters taxonomically: following revision, both are treated as distinct species. Golden colour alone is not reliable identification.

Natural habitat

The species is known mainly from the Ganges and Brahmaputra drainages of northern India, Nepal and Bangladesh. Records also exist from Tamil Nadu; some Myanmar reports need investigation. It inhabits sluggish, sometimes turbid water over mud or silt and the margins of rivers and tributaries. Shallow streams through cultivated land may vary seasonally in depth, flow and clarity.

Aquarium and layout

Use at least a 60 × 30 cm base and about 54 litres. Plant the aquarium densely, with floating plants or wood to diffuse light and create calm areas. The species comes from often sluggish water and may struggle in strong currents. Add it only to a fully mature, biologically stable aquarium; do not introduce it to a young tank.

Water conditions

Seriously Fish recommends 18–24 °C, pH 6.0–7.0 and GH 1–10 dGH. A stable pH and mature filtration are especially important; chasing an exact number with rapid corrections can create harmful swings. Keep conditions within the stated ranges and acclimate new fish gradually.

Behaviour and group size

This barb is very peaceful but timid. Keep eight to ten together. Large or boisterous companions may intimidate it or outcompete it at feeding time. Choose only small, calm species and consider activity, adult size and swimming space too; matching water values alone does not establish compatibility. A quiet feeding period after arrival may help establish appetite.

Feeding

Pethia gelius is a micropredator of small insects, worms, crustaceans and other zooplankton. Offer food that is genuinely small enough. Complete flakes or fine granules can be used, but do not feed dry foods exclusively. Regularly provide small portions of Daphnia, Artemia or other suitable live/frozen foods. Imported specimens may arrive emaciated; reduce competition while they learn to feed.

Breeding

The species scatters eggs and provides no parental care. Fry may occasionally appear in a mature stable aquarium, but a separate dimly lit tank is safer for deliberate breeding. Use an egg grid, marbles, fine-leaved plants or spawning mops and remove adults. Seriously Fish reports hatching after 24–36 hours and free swimming after three to four days; begin with infusoria-grade food.

Sources & review

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

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