Freshwater clam (Corbicula javanicus) — 1-2cm

Overview

The freshwater clam Corbicula javanicus, commonly known as the Asian or Javanese freshwater clam, is a peaceful burrowing bivalve that adds natural filtration interest to mature, well-fed aquariums. Native to freshwater systems in Southeast Asia, particularly Java and surrounding Indonesian regions, this species plays an important ecological role as a filter feeder, processing microscopic plankton and suspended organic particles from the water column. Available for sale UK aquarists seeking unusual invertebrates will find the freshwater clam a fascinating addition, though its moderate care requirements and specialized feeding needs mean it is best suited to established, biologically mature aquariums with stable water chemistry and abundant natural foods.

Appearance and Colouration

Corbicula javanicus displays a compact, rounded triangular shell with a smooth to slightly ribbed surface. Colouration ranges from cream to pale brown or greenish-brown, often with subtle banding or growth rings. The shell is relatively thick and robust for a freshwater bivalve, and the inner nacre is typically cream to pale pink. At 1-2cm juveniles are small and delicate, and at full maturity they reach approximately 2cm in length. The siphons, visible when the clam is open and filtering, extend slightly beyond the shell edges to draw in water. When healthy and secure, the clam will remain partially buried in the substrate with the siphons exposed.

Natural Habitat

Native to freshwater rivers, streams, lakes, and ponds across Southeast Asia, especially Java and the Indonesian archipelago, Corbicula javanicus inhabits soft, muddy or sandy substrates with stable water chemistry and abundant microscopic plankton and suspended organic matter. These environments feature warm, still to slow-moving water with moderate to neutral pH and plenty of natural biological activity. In the wild, freshwater clams burrow into the substrate and filter large volumes of water daily, contributing to natural water clarity and nutrient cycling. Recreating these stable, food-rich conditions is essential for captive success.

Aquarium Setup

Provide a minimum of 75 litres with a mature, well-established filtration system that maintains excellent water quality without removing all suspended organic matter. Use a soft, fine substrate such as sand or smooth mud that allows the clam to burrow easily without damaging the shell. Avoid sharp gravel, rough decorations, and aggressive substrate disturbance from tankmates or filtration. Gentle to moderate water flow is ideal to deliver suspended food particles whilst avoiding strong currents. Maintain stable water parameters with moderate hardness and alkalinity to support shell health. Avoid frequent large water changes that disrupt the suspended food supply.

Diet and Feeding

Corbicula javanicus is a specialized filter feeder that consumes microscopic plankton, fine suspended organic particles, biofilm, and phytoplankton. In aquaria, it benefits from very fine powdered foods such as liquid phytoplankton, rotifers, or finely crushed spirulina suspended in the water column. Do not provide sinking pellets or large particles, as the clam cannot process them. Feeding is passive and continuous; the clam filters water constantly when conditions are suitable. Success depends on maintaining a steady supply of microscopic foods in the water column, which can be challenging in home aquaria.

Behaviour and Temperament

Freshwater clams are entirely peaceful and sessile, spending their time partially buried in the substrate with the shell slightly open to allow water flow through the gills. They are inactive and do not exhibit exploratory or mobile behaviour. The clam will burrow deeper if disturbed, using the muscular foot to push into the substrate. During periods of stress or poor water quality, the shell will close tightly until conditions improve. These clams are sensitive to changes in water chemistry, temperature, and food availability, requiring very stable conditions to thrive. They are non-aggressive and pose no threat to any tankmates.

Suitable Tank Mates

Compatible with small, peaceful fish that will not disturb the substrate, such as small tetras, rasboras, livebearers, and peaceful danios. Snails make excellent tankmates and pose no threat. Avoid loaches, puffers, crayfish, large cichlids, goldfish, and any species that dig, uproot plants, or prey on bivalves. Tankmates should be chosen for their non-disruptive behaviour and lack of interest in the clam. A quiet, stable community tank with minimal substrate disturbance is ideal. Ensure tankmates do not consume all suspended food, as the clam requires a constant supply of microscopic particles.

Breeding

Breeding is uncommon in home aquaria. Corbicula species are often hermaphroditic and may release larvae in suitable conditions, but successful rearing is difficult and usually requires stable, mature water with appropriate plankton levels. Larvae are microscopic and require specialised care with abundant natural foods. Most aquarists do not attempt breeding, as the process is challenging and poorly understood. Success is rare even in dedicated conservation or research programmes. Most specimens kept in home aquaria are wild-collected or commercially farmed.

Special Considerations

Requires a mature, well-established aquarium with fine suspended food available; it cannot survive in a bare, ultra-clean tank. Keep substrate fine and soft so the clam can burrow, and avoid copper-based medications, which are fatal to all molluscs. Do not disturb the substrate or move the clam unnecessarily, as stress can cause it to close and cease feeding. Monitor water quality closely, as clams are sensitive to ammonia, nitrite, and rapid parameter changes. Many specimens perish in captivity due to starvation, as home aquaria rarely provide sufficient natural plankton. Moderate care level indicates experience and attention to detail are required for success.

Why Buy from Tropical Fish Co

Tropical Fish Co is a trusted UK supplier of unique, healthy freshwater invertebrates including Corbicula javanicus freshwater clams. Each specimen is carefully selected for robust health, active filtering behaviour, and excellent condition. Our livestock is quarantined and health-checked before dispatch, ensuring you receive only the finest quality. We provide expert care advice, detailed species information, and ongoing support to help you succeed with specialist invertebrates. With fast, secure delivery across the UK and a commitment to sustainable, responsible fishkeeping practices, Tropical Fish Co is your reliable partner for premium aquatic livestock and unusual species.