Golden Dwarf Barb
Pethia gelius
Cyprinidae
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About
Two different fish reach a shop shelf under the name golden barb, and this is the small one. FishBase's own common name for Pethia gelius is "Golden barb", and the trade uses those same two words for Barbodes semifasciolatus, a 7 cm cyprinid from a different genus that this catalogue files as the gold barb. Check the binomial before you pay. What Pethia gelius actually is: a 4–5 cm barb from the Ganges and Brahmaputra drainages of northern India, Nepal and Bangladesh, pale yellow with bright yellow dorsal, pelvic and anal fins, three diffuse black blotches down the flank and a broad black band around the caudal peduncle. Seriously Fish finds it in West Bengal in "slow-moving, shallow streams passing through cultivated land such as rice fields", and that is the animal: shallow, sluggish, shaded water rather than current. Two things then get lost between the stream and the shop tank. The first is heat. FishBase files the species as subtropical at 18–22 °C, Seriously Fish gives 18–24 °C, and AquaInfo says flatly that "the species is quite sensitive to high temperatures" — so a community tank held at 26 °C for the cardinal tetras is already above every number three independent sources will give you. The second is the state it arrives in. Seriously Fish warns that "P. gelius is frequently emaciated post-import and may require an acclimatisation period during which it’s able to feed in the absence of competitors", and separately to "not add this fish to a biologically immature tank as it can be susceptible to swings in water chemistry". Read together, those two sentences describe a quarantine tank and several weeks of small live food, not a bag of filler for an aquarium that finished cycling last week. Even the name is recent: Knight (2013) settled the species' identity with a neotype, revalidated the congener P. canius and described the closely related P. aurea — three fish that had until then been treated as colour phenotypes of one. In life gelius is the pale yellow one; P. canius is reddish.
Care
A group of 8–10 in a densely planted tank with base dimensions of at least 60 × 30 cm; Seriously Fish's own filter note puts that footprint at a volume of 54 litres, so 60 L is the honest floor. Floating plants and driftwood roots to diffuse the light, a dark substrate, and gentle filtration — this fish comes from sluggish water and "may struggle if there is a fast current". Keep it cool at 20–23 °C and do not let a heater shared with tropical tankmates push it past 24. Soft, slightly acidic water (pH 6.0–7.0, 1–10 °dGH) in a mature, chemically stable aquarium. It is not a general community barb: Seriously Fish calls it "very peaceful but does not make an ideal community fish due to its small size and rather timid nature" and names the company it should keep — Microdevario, Trigonostigma, smaller Danio, Lepidocephalichthys, and Caridina or Neocaridina shrimp. Quarantine new stock and feed it up before it meets anything that eats faster than it does.
Diet
Micropredator on small insects, worms, crustaceans and zooplankton, with some algae taken as well. Small live and frozen daphnia and Artemia daily, plus good flakes and granules small enough for the mouth.
Tankmate compatibility
Gets along with (134)
Possible with care (193)
Avoid (91)
Computed by the AquaSage engine for a spacious reference tank — always check the full verdict for your exact setup in the calculator.
Telling males from females
What works for this species, most reliable first.
- Colour and patternA hint only · from about 6 months, and only on a settled fish
In rainbowfish, killifish and several barbs the male carries the colour — deeper and more saturated, intensifying further when he displays.
- Extended finsA hint only · from about 8 months, and later in a suppressed male
On many cichlids and killifish the male's dorsal and anal fins draw out into trailing points as he matures, while the female's stay rounded.
- Belly depthA hint only · only on well-fed adults, and only as a comparison
For most tetras, barbs and rasboras this is all there is: a conditioned female is deeper through the belly than a male of the same length.
Also in these lists
Similar species
Same category and the closest water parameters — if this species isn't quite it, start here.
Sold in Lithuania
These Lithuanian shops listed this species in their public catalogue (checked August 8, 2026). Stock moves — ask before you travel.
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Frequently asked questions
- What tank size does a Golden Dwarf Barb need?
- A Golden Dwarf Barb needs an aquarium of at least 60 litres (15.9 US gallons) with a footprint at least 60 cm (23.6 in) long — for this species, swimming length matters as much as raw volume.
- What water parameters does a Golden Dwarf Barb need?
- Golden Dwarf Barb does best at 18–24 °C (64.4–75.2 °F), pH 6–7.2 and a general hardness of 1–10 °dGH.
- What group size does a Golden Dwarf Barb need?
- Golden Dwarf Barb is a social species — keep a group of at least 8 so natural behaviour emerges and stress stays low.
- Is the Golden Dwarf Barb suitable for beginners?
- Golden Dwarf Barb sits in the middle of the difficulty scale — manageable for a careful beginner who has done the reading, but it has specific needs worth researching first.