Fish
Java Barb (Tawes)
Barbodes schwanenfeldii
Origin: Widely distributed across mainland Southeast Asia — Cambodia, Laos, Thailand, Vietnam — and the Indonesian islands of Java and Sumatra. Inhabits rivers, lakes, floodplains, and irrigation channels with slow to moderate flow.
Also known as: Silver barb, Tawes, Bream-shaped barb, Thai silver barb
Fact sheet
- Size
- 35 cm
- Lifespan
- 10 years
- Minimum tank size
- 400 L
- Temperature
- 22–28 °C
- pH
- 6.5–7.5
- Hardness GH
- 5–15 °dH
- Temperament
- Peaceful
- Social behavior
- Schooling
- Swimming zone
- Middle
- Diet
- Omnivore
- Jumps out
- Yes
- Eats plants
- Yes
Varieties
Overview
The Java barb is a large freshwater cyprinid resembling a bream in body shape — a feature reflected in its Russian common name 'bream-shaped barb'. Adults reach 25–30 cm, making this one of the largest barbs kept in aquaria. It is extensively cultured in Southeast Asian aquaculture as a valuable food fish but appears infrequently in the hobby due to its demanding space requirements. The species is highly active and easily startled, requiring a spacious aquarium with a secure cover, as it can leap powerfully when alarmed. In nature it serves an important ecological role as a consumer of algae and aquatic vegetation.
Appearance
The body is deep, strongly laterally compressed, and features a distinctly arched dorsal profile that creates the bream-like silhouette. Overall colouration is silvery with a faint yellowish or golden sheen; the caudal and dorsal fins are plain grey-silver, while pelvic and anal fins are pale yellow. The head is small with a forward-pointing terminal mouth. Scales are large and well-defined.
Care
A minimum aquarium footprint of 210 × 60 cm (approximately 750 L) is required to provide adequate open swimming space. Temperature 20–26°C, pH 6.0–8.0, hardness 2–15 dGH. Powerful filtration from two units rated at 1500–1900 L/h each, combined with strong oxygenation, is essential. A heavy, tight-fitting lid is mandatory as the species leaps when startled. Groups of at least six are recommended to reduce stress-related skittishness.
Feeding
An opportunistic omnivore with a strong herbivorous tendency. In the wild it consumes algae, aquatic plants, fallen fruits, and small invertebrates. In the aquarium it readily accepts vegetables (peas, blanched spinach, courgette), quality pellets, flakes, and live or frozen foods. Without plant matter in the diet it may consume tender aquarium plants.
Compatibility
Not aggressive towards tankmates but will consume any fish small enough to swallow. Best kept with other large fish of comparable or greater size. A schooling species — groups of at least six are needed for the fish to feel secure and behave naturally.
Breeding
Rarely if ever bred in home aquaria due to extreme space requirements. In nature it is an egg-scattering spawner with no parental care. Commercial aquaculture propagation is achieved through hormonal injection. The species is one of the most important cultured food fish in Southeast Asia.
Fun facts
Tawes is one of Southeast Asia's most important aquaculture species, raised in ponds by the millions to support regional food security. The species is so easily startled that a sudden noise or movement can trigger mass panicked leaps from an open aquarium. Despite superficial resemblance, the Java barb is not related to the European bream — the two belong to entirely different families.