Shellfish (shrimp, crab, lobster, clams, oysters, mussels)
This page is a scaffolded entry for HMTc Taxonomy v2.0 Category 6 (Seafood), Row 4: Shellfish (shrimp, crab, lobster, clams, oysters, mussels). Evidence ingest into this row is in progress; this page is the routing destination for source-page declarations of products: [shellfish]. Sections below are populated by the routing layer (CLAUDE.md Part 5b) as sources land. Where a section is empty, the row has not yet accumulated contributing sources of the required kind.
Who this page is for
- Brand legal teams
- What the peer-reviewed and regulatory literature reports for heavy-metal occurrence in Shellfish (shrimp, crab, lobster, clams, oysters, mussels), with applicable regulatory caps and source-traceable findings. Use this page to evaluate certification or class-action exposure on a literature-anchored basis.
- Brand regulatory affairs / QA
- The current evidence base for Shellfish (shrimp, crab, lobster, clams, oysters, mussels), the levers most-effective at reducing heavy-metal load, and the applicable regulatory limits with jurisdiction and basis.
- Retailers and category buyers
- The row-level assortment risk profile and where the literature distinguishes higher-risk from lower-risk product configurations within this row.
- HMT&C staff (internal)
- HMT&C certification thresholds for products in this row are developed under the certification program at heavymetaltested.com, not on this public page. The Index and HMT&C operate on the same evidence base but apply different publication rules; see the methodology for the separation.
Methodology
This page reports what the cited sources say about heavy-metal concentrations in shellfish (shrimp, crab, lobster, clams, oysters, mussels). Speciation is non-substitutable per CLAUDE.md Part 14 (iAs vs tAs, MeHg vs tHg, Cr-VI vs total Cr). Basis is preserved (finished-product as sold unless the source specifies otherwise; see each row for the basis label). Non-detect handling follows each source’s reporting convention. Pooling is avoided across LOD/LOQ, period, geography, and analytical-basis differences. HMT&C certification thresholds for products in this row are developed under the certification program at heavymetaltested.com, not on this page; this public page reports literature evidence only.
The applicable regulatory jurisdictions for this row are: FDA, EU, Codex.
Literature Evidence Summary
Pending ingest. The routing layer will surface direct-row-fit sources here as they are added to the corpus with products: [shellfish] in source-page frontmatter.
Source Evidence Inventory
Pending ingest. The routing layer populates this section from the source-page set declaring products: [shellfish].
Broad Product Context: Author-Scope Index
Pending ingest. The routing layer surfaces sources whose author-stated scope is broader than this row (route_kind: broad_product_context) as they are added.
Federal/Regulatory Limits vs Field Findings
Pending ingest. The applicable regulatory jurisdictions for this row are recorded in the page frontmatter; the crosswalk table is generated by tools/apply-product-crosswalk-sections.mjs once regulation pages and field-evidence sources are routed to this row with structured limit values.
Levers to reduce contamination
Practical interventions to reduce heavy-metal load in this row, ordered by impact magnitude. Each lever names the magnitude of the effect with a cited source; cross-links to dedicated mitigation pages where they exist.
- Sourcing levers — Pending ingest.
- Agronomic levers — Pending ingest. (See agronomic for general agronomic mitigation context.)
- Processing levers — Pending ingest. (See processing.)
- Formulation levers — Pending ingest. (See formulation.)
- Testing and QC levers — Pending ingest. (See testing-and-qc when published.)
- Packaging and storage levers — Pending ingest. (See packaging-and-storage when published.)
How standards math uses this page
HMT&C certification thresholds for this row are developed under the certification program at heavymetaltested.com, not on this page. The row-standard for this row is an aggregate computed from the contributing source pool in the row’s native finished-product basis; it is not a per-source decoration of any single value cited on this page. This public page reports literature evidence only.
Historical recalls and enforcement
Pending ingest. Regulatory events (recalls, enforcement actions, import alerts) relevant to this row will be added as agency records are ingested into the corpus.
Sources
Pending ingest. The Source Legend below is auto-generated by tools/evidence/build-source-legend.mjs once source pages declaring products: [shellfish] are added.
Sources
Auto-generated from source-page frontmatter. The “Used on this page for” column is populated by the orchestrator’s POPULATE-SOURCE-LEGEND action; pending entries appear as *[awaiting synthesis]*.
| # | Citation | Year | Type | Used on this page for |
|---|---|---|---|---|
| 1 | Xu et al. 2025. Heavy metal risks in aquatic foods, Environment International | 2025 | Peer-reviewed | tHg, MeHg, Cd, Pb, tAs, iAs occurrence in 138,281 test records for aquatic food products from the WHO Food Safety Collaborative Platform (FOSCOLLAB) database; covers fish,… (n=138281) |
| 2 | Bruno et al. 2024. Mineral composition in mussel Mytilus galloprovincialis and clam Tapes decussatus from Faro Lake of Messina: risk assessment for human health, Frontiers in Toxicology | 2024 | Peer-reviewed | IT/EU tAs, Cd, Pb, tHg, Ni, Cr occurrence in 80 specimens of Mytilus galloprovincialis (mussel) and 80 specimens of Tapes decussatus (clam) collected from Faro Lake, Messina,… (n=160) |
| 3 | Bjerregaard et al. 2023. In Search of Mercury Lost from Sediments in a Previously Contaminated Coastal Area, Harboøre Tange, Denmark, Bulletin of Environmental Contamination and Toxicology | 2023 | Peer-reviewed | DK/EU tHg occurrence in Blue mussels (Mytilus edulis), periwinkles (Littorina littorea), brown shrimps, and amphipods from Nissum Broad coastal stations, Denmark; also… (n=137) |
| 4 | Hall et al. 2023. Linking Mesoscale Spatial Variation in Methylmercury Production to Bioaccumulation in Tidal Marsh Food Webs, Environmental Science & Technology | 2023 | Peer-reviewed | US MeHg, tHg occurrence in Primary and secondary consumers (gastropods, bivalves, amphipods, beetles, spiders, shrimp, crabs, fish) from four marsh features at three… (n=116) |
| 5 | Leclerc et al. 2023. Enhanced Bioaccumulation and Transfer of Monomethylmercury through Periphytic Biofilms in Benthic Food Webs of a River Affected by Run-of-River Dams, Environmental Science & Technology | 2023 | Peer-reviewed | CA MeHg, tHg occurrence in Periphyton, benthic macroinvertebrates, and juvenile fish from St. Maurice River (Québec, Canada) affected by two run-of-river hydroelectric power… |
| 6 | Onyegeme-Okerenta et al. 2023. Potential Toxic elements in shellfish from three rivers in Niger Delta, Nigeria: bioaccumulation, dietary intake, and human health risk assessment, Environmental Analysis, Health and Toxicology | 2023 | Peer-reviewed | NG tAs, Cd, Cr, Pb, Ni occurrence in Three shellfish species (Penaeus monodon, Crassostrea rhizophorae, Tympanostomus fuscatus) from three rivers in Niger Delta, Nigeria (Buguma, Krakrama,… (n=27) |
| 7 | Raju et al. 2021. Heavy Metal Determination of Bivalves in Cagayan Valley, Philippines, Scholars Academic Journal of Biosciences 9(10):256-258 | 2021 | Peer-reviewed | PH Pb, Cd occurrence in Two bivalve species from Cagayan Valley, Philippines: freshwater clam (Corbicula fluminea) and marine mussel (Mytilus edulis); collected with… (n=2) |
| 8 | Di et al. 2020. Heavy Metals and PAHs in Meat, Milk, and Seafood From Augusta Area (Southern Italy): Contamination Levels, Dietary Intake, and Human Exposure Assessment, Frontiers in Public Health 8:273 | 2020 | Peer-reviewed | [awaiting synthesis] |
| 9 | Humberto et al. 2020. Trace metals in two wild populations of the squalid callista clam (Megapitaria squalida) in the southeastern Gulf of California, Mexico, Revista Internacional de Contaminacion Ambiental | 2020 | Peer-reviewed | [awaiting synthesis] |
| 10 | Centre for Food Safety 2019. Organotin Compounds in Aquatic Products Available at Local Markets, Risk Assessment Studies Report No. 60, Centre for Food Safety, Hong Kong FEHD | 2019 | Government report | [awaiting synthesis] |
| 11 | Liang et al. 2019. Analysis of Heavy Metals in Foodstuffs and an Assessment of the Health Risks to the General Public via Consumption in Beijing, China, International Journal of Environmental Research and Public Health | 2019 | Peer-reviewed | [awaiting synthesis] |
| 12 | Martin et al. 2018. Seasonal levels of heavy metals in soft tissue and muscle of the pen shell Atrina maura from a farm in the southeastern coast of the Gulf of California, Mexico, Revista Internacional de Contaminacion Ambiental | 2018 | Peer-reviewed | [awaiting synthesis] |
| 13 | Harding et al. 2018. Bioaccumulation of methylmercury within the marine food web of the outer Bay of Fundy, Gulf of Maine, PLoS ONE | 2018 | Peer-reviewed | [awaiting synthesis] |
| 14 | Rajeshkumar et al. 2018. Studies on seasonal pollution of heavy metals in water, sediment, fish and oyster from the Meiliang Bay of Taihu Lake in China, Chemosphere | 2018 | Peer-reviewed | CN Pb, Cd, Cr, Cu occurrence in Crucian carp (Carassius carassius) and Pacific oyster (Crassostrea gigas) from seven sampling sites in Meiliang Bay, Taihu Lake,… |
| 15 | Martin et al. 2017. Heavy-metal contents in oysters (Crassostrea gigas) cultivated on the southeastern coast of the Gulf of California, Mexico, Hidrobiologica | 2017 | Peer-reviewed | [awaiting synthesis] |
| 16 | Baxter et al. 2015. Total Diet Study of metals and other elements in food, Food and Environment Research Agency report for the UK Food Standards Agency, Fera report 15/06, project FS102081 | 2015 | Government report | [awaiting synthesis] |
| 17 | Shue et al. 2012. Seasonal variations of heavy metals in the bivalve’s mollusks from Ta-Peng Bay lagoon in southwestern Taiwan, Advanced Materials Research | 2012 | Peer-reviewed | [awaiting synthesis] |
Page history
The five most recent substantive edits to this page. The full version history lives in git; when DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.