Navigating Seaweed Chain of Custody Rules Under the ASC-MSC Standard

What the seaweed requirement is, and why it exists

Seaweed production represents a rapidly growing sector bridging wild capture harvesting and aquaculture. Quality managers, compliance leads, and internal auditors must recognise that the Marine Stewardship Council and Aquaculture Stewardship Council jointly govern seaweed supply chains. Under Section 1 of the MSC Chain of Custody Certification Requirements v3.2, organisations trading or handling seaweed certified against the ASC-MSC Seaweed (Algae) Standard must obtain Chain of Custody certification to make certified claims.

Unlike standard finfish or shellfish certificates, seaweed operations require a dedicated certificate scope and specific commercial agreements. Under Clause 6.3.2.b.i of the Certification Requirements v3.2, any client intending to handle seaweed must sign the Seaweed Partnership Agreement with MSCI before the Conformity Assessment Body can grant certification. This requirement ensures that legal, licensing, and traceability safeguards account for the unique wild, farmed, and enhanced production models used in global seaweed harvesting.

Seaweed production categories and product identification rules

The ASC-MSC Seaweed Standard classifies harvesting operations into distinct production categories within the Public Certification Report. Under Guidance 2.1 of the MSC Chain of Custody Standard: Default Version v5.1 and Group Version v2.1, organisations must map these production categories directly to one of three mandatory product identification categories.

Wild seaweed harvested under Category A receives the "MSC" product identification category. Farmed seaweed cultivated under Categories Bii and Cii receives the "ASC" product identification category. Enhanced seaweed produced under Categories Bi and Ci, as well as any mixed production batches, receives the "ASC-MSC" product identification category.

Under Clause 2.1 and Clause 2.2 of the Default Standard v5.1, certificate holders must maintain the product identification category at all physical handling stages and explicitly display the category on sales invoice line items. Furthermore, under Clause 1.1.1, organisations purchasing directly from a seaweed production unit must verify the production category code in the supplier certificate or Public Certification Report upon receipt.

Mixing rules, trademark usage, and audit procedures

Segregation controls under Principle 3 maintain the distinction between wild, farmed, and enhanced seaweed. Under Clause 3.4 and Guidance 3.4 of the Default Standard v5.1, organisations should maintain physical segregation back to the origin production category if they intend to market product under single MSC or ASC claims. However, if an organisation mixes different seaweed production categories during storage or processing, Clause 3.4 mandates that the batch must thereafter carry the product identification category "ASC-MSC".

Trademark application rules reflect these production category distinctions. Under Clause 7.5.4.a.ii of the General Certification Requirements v2.6, on-product labels must align with the origin: the MSC ecolabel applies to wild Category A stock, the ASC logo applies to farmed Category Bii and Cii stock, and the co-labelled ASC-MSC logo applies to enhanced Bi and Ci or mixed stock.

Step-by-step procedure for implementing seaweed Chain of Custody

• Confirm that the supplying seaweed production unit holds a valid ASC-MSC Seaweed certificate and identify its production category under Clause 1.1.1.
• Submit a formal application or scope extension request to your certification body to add seaweed handling under Clause 6.3.2.
• Sign the mandatory Seaweed Partnership Agreement with MSCI and retain written confirmation under Clause 6.5.1.b.
• Establish receiving procedures to verify that incoming delivery notes and invoices specify the correct product identification category under Clause 2.1.
• Configure ERP systems to print the required product identification category on all outgoing sales invoice line items under Clause 2.2.
• Implement physical lot tracking to ensure mixed production batches are reclassified as ASC-MSC under Clause 3.4.

Example

A seaweed processing plant receiving wild-harvested Category A kelp and farmed Category Bii kelp seeks to produce a blended dried product. The compliance manager first confirms that the site holds a separate Seaweed CoC certificate and a signed Seaweed Partnership Agreement under Clause 6.5.1.b. When receiving raw deliveries, staff log Category A as "MSC" and Category Bii as "ASC" on receipt logs under Clause 2.1. During blending, production staff apply Clause 3.4 and assign the final packaged batch the product identification category "ASC-MSC", ensuring outgoing invoices display "ASC-MSC Dried Kelp" under Clause 2.2.

Before your audit

• Confirm that your organisation holds a signed Seaweed Partnership Agreement with MSCI under Clause 6.5.1.b.
• Verify that a separate Seaweed Chain of Custody certificate code is active on the scheme database under Clause 11.1.5.c.ii.
• Cross-check supplier certificate codes to confirm production categories A, Bi, Bii, Ci, or Cii under Clause 1.1.1.
• Inspect sales invoice templates to ensure line items display MSC, ASC, or ASC-MSC product identification categories under Clause 2.2.
• Review batch records to confirm that mixed production categories carry the required ASC-MSC designation under Clause 3.4.
• Audit packaging designs to verify that on-product logos correspond to the correct production category under Clause 7.5.4.a.ii.
• Verify that non-certified subcontractors handling seaweed are included in your certificate scope under Table 4 definitions.

Questions people ask

Does a company holding an MSC CoC certificate need a new certificate to handle seaweed?

Yes, a company holding an MSC Chain of Custody certificate must obtain a scope extension and receive a separate Seaweed certificate code under Guidance 6.3.2.d and Guidance 11.1.5.c.ii of the MSC Chain of Custody Certification Requirements v3.2. Both scopes are evaluated during a single audit.

Can B2B invoice acronyms be used for seaweed without a license agreement?

No, unlike general seafood rules, any party intending to handle ASC-MSC seaweed must ensure a Seaweed Partnership Agreement is in place before using trademarks under Clause 4.9.4 of the MSC General Certification Requirements v2.6. This licensing requirement applies even when using acronyms solely for business-to-business product identification on sales invoices.

What claim category applies if wild and farmed seaweed are processed together?

If wild seaweed (Category A) and farmed seaweed (Category Bii or Cii) are mixed during processing or storage, the resulting product must carry the product identification category "ASC-MSC" under Clause 3.4 and Guidance 3.4 of the Default Standard v5.1. Organisations must maintain clear physical segregation back to origin if they wish to market items under individual MSC or ASC claims.

Which logo is applied to consumer packaging for enhanced seaweed?

Under Clause 7.5.4.a.ii of the MSC General Certification Requirements v2.6, enhanced seaweed from production categories Bi and Ci must carry the ASC label or the joint ASC-MSC label as specified in MSCI licensing terms. The specific label configuration must receive prior written approval from MSCI under the Seaweed Partnership Agreement.

Reference documents

• MSC Chain of Custody Standard: Default Version v5.1
• MSC Chain of Custody Standard: Group Version v2.1
• MSC Chain of Custody Certification Requirements v3.2
• MSC General Certification Requirements v2.6
• ASC Chain of Custody Module v1.1