Raw Material
Commodity GroupBivalve molluscs (clams)
Scientific NameRuditapes philippinarum
PerishabilityMedium
Growing Conditions- Intertidal on-bottom culture in sheltered sites with substrates of gravel, sand, mud and shell; requires adequate water quality for filter-feeding bivalves.
- Salinity for breeding and rearing reported in FAO guidance as 24–35‰ (tolerance range 13.5–35‰).
- Temperature range for growth reported in FAO guidance as 15–28°C optimal, with short-term survival outside that range; spawning linked to warmer conditions in the low-20s °C.
Consumption Forms- Cooked dishes (soups, noodle dishes, pasta/seafood preparations)
- Frozen shell-on clams for foodservice/retail cooking
- Frozen shucked clam meat for ingredient use in prepared foods
Grading Factors- Shell integrity (no broken shells) and removal of dead/unwholesome animals
- Size/count and meat yield expectations by buyer specification
- Freedom from extraneous matter (mud, sand, shell fragments) supported by conditioning/depuration practices
- Compliance with official food-safety controls for bivalve molluscs (e.g., microbiological hazards and biotoxin management)
Planting to HarvestOften reaches market size over roughly 2 to 3 years depending on local carrying capacity and conditions; some regions harvest earlier (about 10–16 months reported for parts of China) while other regions harvest later (about 16–30 months reported for Europe and North America).
Market
Frozen Manila clam (Ruditapes philippinarum) is a globally traded bivalve product supplied from a mix of wild fisheries and on-bottom aquaculture, commonly sold as shell-on or shucked meat. Production is strongly centered in East Asia, with China identified as the largest producer and Japan and the Republic of Korea also major producers; European production is significant in northern Adriatic lagoons, with Italy a leading EU producer. Trade and market access are highly shaped by official shellfish sanitation controls (approved growing areas, depuration/relaying, and documentation) and by episodic food-safety disruptions such as toxic algal blooms and microbial contamination events. As a frozen mollusc product, it is frequently represented in customs/trade statistics under HS 030772 (frozen clams, cockles and ark shells), and cold-chain integrity is central to quality retention in long-distance distribution.
Major Producing Countries- 중국Identified as the largest producer in published scientific literature; FAO species fact sheet describes it as a predominant traditional cultured clam in China.
- 일본Identified as a major producer following China in published scientific literature; also a key historical/native range area for the species.
- 대한민국Identified as a major producer following Japan in published scientific literature; species is widely harvested/cultured on Korean tidal flats.
- 이탈리아Reported in peer-reviewed literature as the main EU producer of R. philippinarum, with production concentrated in northern Adriatic lagoons (Po River delta area).
Major Importing Countries- 일본Japanese market linkage is documented in supply-chain improvement/certification initiatives involving Japanese buyers for Manila clam fisheries.
Risks
Food Safety HighBiotoxin contamination from harmful algal blooms can cause abrupt harvest-area closures and import rejections because bivalves can accumulate toxins from toxin-producing algae; freezing supports distribution but does not substitute for harvest-area monitoring and official controls.Prioritize sourcing from officially monitored/approved growing areas with documented biotoxin controls; diversify origins and maintain contingency supply for closure periods.
Food Safety MediumMicrobiological hazards (including viruses and Vibrio spp.) are a persistent risk for bivalve molluscs; Codex guidance notes depuration parameters should be assessed but that viruses and Vibrio can be more persistent than indicator bacteria, creating residual risk even when indicator results improve.Use validated sanitation programs (approved depuration/relaying, hygienic handling, time/temperature controls) and require documentation and lot traceability for verification and recall readiness.
Animal Health MediumAquaculture disease events can reduce output or constrain seed movement; FAO species guidance identifies brown ring disease (Vibrio tapetis) as a concern and highlights the need for preventive measures and careful transfer management, while published research notes parasite and pathogen pressures as major threats in producing regions.Implement biosecurity and health monitoring for seed and grow-out areas; manage transfers cautiously and align with competent-authority requirements.
Regulatory Compliance MediumMarket access depends on compliance with official shellfish sanitation frameworks (approved harvesting areas, purification controls, and documentation). Non-compliance can lead to border holds, delistings, and reputational damage for exporters and importers.Maintain auditable end-to-end documentation (harvest area, purification status, cold-chain records) aligned to Codex guidance and major importing-market sanitation programs.
Traceability And Fraud MediumSeafood fraud and origin misrepresentation risks are documented for Manila clam supply chains, especially in high-value regions where provenance is commercially important, creating both consumer-safety and market-integrity exposures.Adopt robust traceability (lot-level chain of custody), origin verification testing where appropriate, and buyer audits focused on labeling and documentation integrity.
Climate MediumClimate variability (warming waters) and related ecosystem shifts can affect survival, disease dynamics, and the frequency/severity of toxic algae events impacting bivalve output in major producing countries.Monitor regional water-quality and HAB advisories; diversify sourcing regions and incorporate climate risk into procurement and inventory planning.
Sustainability- Harmful algal blooms and coastal water-quality pressures can disrupt bivalve supply and trigger harvest closures, with spillover into price volatility across bivalve categories.
- Coastal habitat and water-quality management in intertidal flats and lagoons (e.g., nutrient loading, sediment dynamics) influences farming viability and product safety for filter-feeding bivalves.
- Biosecurity and ecological concerns where the species has been introduced outside its native range; FAO notes it has colonized some coastal areas unintentionally and may be considered a pest under specific conditions.
FAQ
Which HS code is commonly used for frozen clams in trade statistics (including Manila clam products)?A common 6-digit code used in customs statistics is HS 030772, which covers frozen clams (including Veneridae family clams such as Manila clam), cockles, and ark shells.
Why is depuration or purification important for clams intended for international trade?Because clams are filter feeders, official programs often require controlled purification (such as depuration or relaying) and verified growing-area status to reduce contamination risks and to meet importing-country sanitation requirements before products are sold live or processed (including freezing).
What storage temperature is typically expected for frozen clam products in the cold chain?International guidance for frozen fishery products commonly expects products to be maintained at or below -18°C (0°F) to preserve quality and reduce defects during storage and retail handling.