Giant Clam
Also known as: Taklobo (Filipino name) · Tridacna gigas (scientific name)
Definition
The Giant Clam (Tridacna gigas), known in the Philippines as taklobo, is the largest living bivalve mollusk on Earth, capable of reaching more than a meter in length and several hundred kilograms in weight. Native to warm waters of the Indo-Pacific including Philippine seas, it anchors on coral reefs and farms its own food through symbiotic algae living in its mantle tissue. Overharvesting for meat and shells has depleted the species, which is protected by Philippine law and international trade rules. (Wikipedia)
Identities
| Source Type | Identity |
|---|---|
| Wikipedia | Giant clam |
| Wikidata | Q751784 |
| DBpedia | N/A |
| ProductOntology | N/A |
| Wiktionary | N/A |
| Library of Congress Subject Headings (LCSH) | N/A |
| MeSH | N/A |
| NCBI Taxonomy | Tridacna gigas |
| AGROVOC | N/A |
| Google Scholar | Tridacna gigas giant clam Philippines coral reef restocking |
| ConceptNet | clam |
| OpenCyc | N/A |
Also Known As
- Taklobo (Filipino name)
- Tridacna gigas (scientific name)
Examples and Analogies
- A Solar-Powered Reef Farmer: The clam’s mantle hosts zooxanthellae algae that photosynthesize and share sugars with their host, functioning like an onboard solar panel that supplies much of its nutrition.
- A Living Bathtub: Old individuals grow so large that a single shell could serve as a laundry basin or baptismal font, a use historical coastal communities actually made of found shells.
Usage Scenarios
1. Reef Restoration Programs
Marine science institutes rear giant clam juveniles in hatcheries and reseed them onto damaged reefs in Bolinao, Palawan, Apo Reef, and Tubbataha to restore filter-feeding and reef structure.
2. Marine Education
Living taklobo displays in aquariums and marine sanctuaries teach visitors about symbiosis, sustainable fisheries, and the vulnerability of slow-growing species.
Strategies
- Support hatchery-and-reseed conservation rather than wild collection, since mature clams take decades to reach breeding size.
- Enforce sanctuary rules in marine protected areas where giant clams are seeded, ensuring they are not poached for meat or the curio shell trade.
- Monitor sedimentation and water quality, as young clams need clear sunlit water for their algal partners to photosynthesize.
Security and Safety Measures
- Harvesting, selling, and exporting giant clams is prohibited under Philippine fisheries and wildlife regulations, and international trade is restricted under CITES.
- Divers should never attempt to pry a clam open or stand on one; a defensive shell closure can trap hands or damage the animal.
- Report markets selling oversized clam shells or meat to the Bureau of Fisheries and Aquatic Resources.
Historical Context
Tridacna gigas was described by Carolus Linnaeus in 1758. Philippine waters historically held some of the species’ densest stands, but twentieth-century harvesting for food and the shell trade stripped many reefs bare. From the 1980s onward, the University of the Philippines Marine Science Institute and partner agencies pioneered giant clam culture at Bolinao, making the Philippines a regional leader in clam restocking science.
Challenges and Controversies
Poaching Demand
Despite protection, illegal collection continues to be driven by demand for clam meat and decorative shells, including incidents of foreign poaching vessels in Philippine waters.
Slow Recovery
Because clams mature slowly and larvae need specific conditions, even successful reseeding takes decades to rebuild breeding aggregations, testing the patience of funders and communities.