ASC Chain of CustodyAquaculture Stewardship Council Chain of Custody
Aquaculture Stewardship Council (ASC) certification is the dominant credibility scheme for responsibly farmed seafood and the chain of custody between the farm and the finished product. For UK retailers the ASC label is the universally-required evidence for responsible-aquaculture claims on farmed species, and the chain-of-custody (CoC) certificate applies to every processor, distributor and packer touching the product. ASC's CoC standard is harmonised with MSC's, with a single integrated audit available for businesses handling both. This page covers the ASC farm standards, the chain-of-custody standard, the manufacturer interface, and how V5 records the chain from certified farm to ASC-labelled SKU.
01What ASC is
ASC was founded in 2010 by WWF and IDH to provide a credible certification system for responsibly farmed seafood. Today ASC operates species-specific farm standards (salmon, shrimp, tilapia, pangasius, seabass and seabream, abalone, bivalve, freshwater trout, flatfish and others) plus a feed standard and a chain-of-custody standard that runs through processors, distributors and packers to the finished product.
02The species-specific farm standards
Each ASC farm standard addresses seven principles applicable to the species: legal compliance, conservation of natural habitat and biodiversity, water resources, feed and resources, fish health, social responsibility (worker welfare, community relations), and animal welfare where applicable. Standards are revised on a published cycle informed by science, stakeholder input and operational experience.
03The Chain of Custody Standard (joint with MSC)
ASC and MSC share a harmonised CoC standard. Businesses handling both wild-catch (MSC) and farmed (ASC) product can hold a single integrated CoC certificate audited under one programme. The standard's requirements mirror those described for MSC: certified product purchased only from certified suppliers, identifiable through every step, segregated from non-certified, traceable with mass-balance reconciliation, and audited annually.
04The Feed Standard
The ASC Feed Standard, in force since 2023, applies to the feed mills supplying ASC-certified farms. It addresses responsible sourcing of marine and plant ingredients, supply-chain transparency, environmental responsibility and social responsibility at the feed mill. Certified farms must use ASC-certified feed once the feed-mill certification window applies to their feed supplier.
05The manufacturer interface
Manufacturers handling ASC-certified salmon, shrimp, tilapia, pangasius or other farmed species must hold their own CoC certificate, verify supplier CoC certificates at goods-in, and run mass balance per certified species/product per period. Most large UK seafood manufacturers hold the joint MSC/ASC CoC certificate covering both wild-catch and farmed lines.
06Retailer expectations
Every major UK retailer requires ASC for responsibly-farmed-seafood claims on own-brand. ASC salmon dominates UK retail farmed-salmon supply; ASC shrimp/prawn is the norm for warm-water shrimp; ASC pangasius and tilapia coverage is growing. Retailer category teams track ASC coverage against published commitments and adjust the own-brand range accordingly.
07How V5 supports an ASC chain
08Common pitfalls
- Operating without a manufacturer CoC certificate and assuming the supplier's certificate carries the claim.
- Mixing certified and non-certified product on the same line without segregation evidence.
- Letting the annual CoC audit slip past the renewal window.
- Buying certified material from a supplier whose own CoC has lapsed.
- Not tracking the ASC Feed Standard transition for relevant species.
Frequently asked questions
Q.Is ASC the same as MSC?+
No. ASC certifies farmed aquaculture; MSC certifies wild-catch fisheries. They share a harmonised chain-of-custody standard so a single integrated CoC audit can cover both.
Q.Does ASC apply to shellfish?+
Yes — ASC has standards for bivalves (oysters, mussels, clams, scallops) and abalone alongside the major finfish and crustacean standards.
Q.How is the ASC Feed Standard relevant to manufacturers?+
It applies primarily to feed mills supplying ASC-certified farms. Manufacturers benefit indirectly: the broader feed-supply transparency strengthens the credibility of the farmed-fish supply chain feeding into their goods-in.
Q.Can a product carry both MSC and ASC?+
Not on the same SKU — MSC is wild-catch and ASC is farmed, so the species and origin determine which applies. A range may include both MSC and ASC SKUs covered by a single joint CoC certificate.
Primary sources
Further reading
V5 Ultimate ships with the ASC Chain of Custody controls already wired in — audit trail, e-signatures, validation evidence. Free trial, no credit card, onboard in days, not months.