Mangrove Clam Captive Breeding Achieved by CMFRI

The ICAR-Central Marine Fisheries Research Institute has achieved captive breeding of the mangrove clam, Geloina erosa, marking step in restoring declining bivalve resources. The breakthrough supports the development of hatchery-based seed production, estuarine aquaculture and mangrove-linked conservation. It also offers a sustainable option for improving livelihoods in coastal communities that depend on mud clam harvests.

Scientific Breakthrough

Scientists induced spawning in controlled hatchery conditions and completed the full embryonic and larval development of the species. Spat settlement was recorded from the 18th day after spawning. This is a major milestone because it confirms that the species can complete its life cycle in captivity. The achievement is among the few documented cases globally of induced breeding, larval rearing and spat production of the mangrove clam.

Species and Habitat

• The mangrove clam is also known locally as Kandal Kakka and mud clam.
• It lives in organic-rich muddy substrates in intertidal mangrove zones.
• The species is ecologically important because it recycles nutrients and stabilises sediments.
• It is also a valued local delicacy, especially in northern Kerala.

Conservation and Livelihood Potential

Wild stocks of mangrove clams have declined sharply across South and Southeast Asia, including India. Major reasons include indiscriminate harvesting, habitat degradation, pollution and coastal development. The absence of scientific stock assessment, size limits and seasonal restrictions has worsened depletion. CMFRI is now working to standardise larval rearing and nursery protocols to improve survival and enable large-scale seed production. Hatchery-produced seeds can support low-input farming and ranching in suitable estuarine systems. This can help restore depleted stocks, reduce pressure on wild populations and strengthen nutritional security.

Way Forward

The development of hatchery technology for mangrove clams can integrate aquaculture with mangrove conservation. It may create a model for community-managed restoration in critical estuarine habitats, especially in coastal Kerala and other mangrove-dependent regions.