Filament Barb Care Guide - Aquarium Setup, Diet & Breeding

The Filament Barb is a large, lively cyprinid with a deep-bodied profile, shimmering golden to olive coloration and dark markings along the flanks. Mature males develop especially striking breeding colours, with red or orange tones and elongated rays extending from the dorsal fin, giving the species its common name.

These active fish are usually found in groups and spend much of their time swimming through the middle and upper areas of the aquarium. They are energetic without being inherently aggressive, although poorly sized groups or cramped conditions can make fin-nipping and chasing more likely.

In the wild, Filament Barbs inhabit clear, flowing waters associated with the Western Ghats. Their native streams and rivers may include rocky stretches, sandy areas, submerged roots and patches of aquatic or marginal vegetation.

The species was once widely known as Puntius filamentosa and is now placed in the genus Dawkinsia. Its attractive finnage, bold patterning and active social behaviour make it a popular choice for aquarists with a spacious freshwater aquarium.

Filament Barbs are native to southern India, particularly the rivers and streams of the Western Ghats in the states of Kerala, Karnataka and Tamil Nadu. They inhabit freshwater environments on the Indian subcontinent.

A group of Filament Barbs should be kept in an aquarium of at least 150 litres, with a recommended footprint of approximately 120 cm by 40 cm to provide adequate swimming length. Use efficient filtration and good oxygenation, while leaving generous open water for active swimming. A fine gravel or sand substrate, smooth stones, driftwood and hardy plants can recreate a river-style habitat; arrange decor around the sides and rear so the fish retain an unobstructed central swimming area. A secure lid is advisable because active barbs may jump.

Up to 15 cm (6 in) in total length. Females are often slightly larger and deeper-bodied, while males are commonly more slender but may develop longer dorsal-fin filaments.

Filament Barbs are omnivorous and should receive a varied diet of quality flakes, granules and small pellets, supplemented with frozen or live foods such as bloodworms, daphnia, brine shrimp and mosquito larvae. Blanched vegetables and algae-based foods can provide useful plant matter. Feed modest portions that the group consumes quickly, with variety helping to maintain colour, growth and breeding condition.

Filament Barbs are best kept with other active, peaceful fish that appreciate similar water conditions. Suitable companions can include larger peaceful barbs, danios, rainbowfish, robust rasboras, peaceful loaches and non-aggressive catfish. Avoid very small, timid fish and species with long, flowing fins, such as bettas and fancy guppies, which may be harassed or have their fins nipped. They should also not be housed with aggressive cichlids or slow-feeding tankmates that cannot compete for food.

Filament Barbs are egg-scattering fish that spawn among fine-leaved plants or spawning mops. Condition a group with plenty of live or frozen foods, then move a well-matched pair or several fish into a separate breeding aquarium with soft, slightly acidic to neutral water. Spawning usually takes place in the morning, with eggs scattered among the vegetation. Remove the adults after spawning, as they may eat the eggs. Hatching generally occurs within a day or two, and the fry can be raised on infusoria before progressing to newly hatched brine shrimp.

Mature males are generally slimmer and develop stronger red or orange breeding colours, especially on the fins and flanks. Their dorsal fin develops distinctive elongated filament-like rays. Females are usually plumper, paler and may grow slightly larger, with shorter dorsal-fin rays.