Javanese Betta

Adult Javanese Bettas reach 4–5 cm in length. The body is elongated with a noticeably large head. The anal fin runs from the middle of the body to the rounded tail fin. The other fins are short and pointed. Colouration ranges from grey to silver or gold. The body is marked with broken dark stripes arranged in rows. The fins are reddish with blue edges. Males are typically more colourful than females.

This species is native to Southeast Asia and is endemic to the island of Java, where it inhabits river systems in the central and western regions. It prefers small, clear streams and brooks originating in hilly areas, particularly quiet backwaters and shaded margins. The natural habitat has clear water and a substrate composed of fallen leaves mixed with rocks. The fish is sometimes found in artificial ponds.

The Javanese Betta is relatively peaceful, but can show intolerance toward other members of its own species, especially males, which view each other as rivals when space is limited. In small tanks, keep them singly or in pairs (male and female). They do well with calm, non-aggressive fish of similar size.

A single fish or pair requires a minimum aquarium volume of 50–60 litres. When setting up the tank, recreate conditions similar to the natural habitat. Provide dimmed lighting, several hiding places made from driftwood or caves, and aquatic plants including floating types. The species is not demanding; some aquarists keep them without substrate, using PVC tubes or inverted ceramic pots as shelters. Success depends on maintaining stable water parameters and temperature within the recommended range. This requires regular tank maintenance: removal of organic waste, partial water changes with treated water, and a quality filtration system, which will reduce the workload and maintenance frequency.

Feed a mix of live and frozen foods such as brine shrimp, daphnia and bloodworm. Specialized commercial diets formulated for gouramis are also suitable.

In good conditions, breeding is not uncommon. During the spawning season, after a brief courtship with characteristic 'embracing' movements, spawning occurs. The female releases eggs one at a time, and the male fertilizes and immediately takes each into his mouth. This continues until all eggs are in his mouth. The male incubates the eggs for 9–12 days. Once the fry are free-swimming, they may need to be moved to a separate tank with the same water conditions to protect them from other fish, though the parents may not pose a threat to their own offspring.

Most health problems arise from unsuitable keeping conditions. A stable, comfortable environment is key to successful keeping. If disease symptoms appear, check water quality first. Correct any deviations immediately. If symptoms persist or worsen, medication may be necessary.

When selecting a Javanese Betta, look for activity and good appearance. A healthy fish should show curiosity, have intact fins, and no visible sores, white coating, or spots on the scales. Avoid fish with clamped fins, laboured breathing, or an unusually swollen belly, which may indicate disease or parasites. Choose individuals that respond actively to food and do not hide constantly. Since this species can be territorial, ask the seller about conditions in the store: overcrowded tanks increase the risk of stress and infection.