What Does MSC Certified Actually Mean? The Seafood Label Explained in Plain Language

The Label You've Seen But Might Never Have Investigated

The blue Marine Stewardship Council logo appears on hundreds of seafood products in grocery stores across the United States, including American Tuna's entire line of wild-caught albacore and salmon. Most shoppers recognize the label as meaning something good. Fewer know exactly what it certifies — and, just as importantly, what it does not. Here is the plain-language version.

MSC certified tuna meaning comes down to three things: the fishery maintains healthy fish stock levels, the fishing operation has minimal impact on the marine environment, and there is effective management in place to keep it that way over time. Those three principles are evaluated by independent third-party auditors against specific, published standards. Passing is not automatic — fisheries fail or lose certification, and the audits are repeated on a five-year cycle.

What the Marine Stewardship Council Actually Is

The Marine Stewardship Council is an international nonprofit organization established in 1997 by Unilever (then one of the world's largest buyers of frozen fish) and the World Wildlife Fund. It was created in response to the collapse of the Grand Banks cod fishery, which had been one of the most productive fishing grounds in the world until industrial overfishing reduced the stock to near-extinction levels by the early 1990s. The goal was to create a credible, science-based standard that would give buyers a reliable way to identify fish caught from well-managed stocks.

MSC operates as a certification and labeling program — it does not do the certifying itself. Independent audit bodies accredited by MSC evaluate fisheries against the published standard and recommend certification. The MSC then grants the label for five years, with annual surveillance audits in between. The chain of custody is also certified separately — meaning processors and retailers who want to use the label on their products must be audited to confirm the certified fish does not get mixed with non-certified fish at any point in the supply chain.

The Three Principles MSC Uses to Evaluate Fisheries

MSC's standard is organized around three core principles, each with specific scoring criteria evaluated during the audit process. The first principle is sustainable fish stocks: the fishery must demonstrate that the target species is at or above the level needed for long-term reproduction, and that fishing pressure is not pushing the population into decline. Auditors assess stock assessment data, catch limits, and long-term population trends.

The second principle is minimizing environmental impact: the fishery must demonstrate that its methods do not cause unacceptable harm to the broader marine ecosystem — including non-target species, habitats, and the broader food web. This is where bycatch management comes in. Pole & Line fishing methods like those used by American Tuna score well here because individual fish handling produces structurally low bycatch rates. Net-based methods require additional gear modifications and documentation to pass this principle.

The third principle is effective management: the fishery must operate within a legal framework, with science-based decision-making, clear rules for responding to stock changes, and mechanisms for stakeholder participation. A fishery can have good stock levels today but fail this principle if there is no system in place to maintain them when conditions change.

What MSC Certification Does Not Guarantee

This is where buyers often fill in gaps with assumptions. MSC certification confirms that the fishery meets the three-principle standard at the time of audit. It does not guarantee a specific fishing method — both Pole & Line and purse seine net fisheries can hold MSC certification if they meet the standard. It does not guarantee domestic sourcing, US processing, or vessel-level traceability. A troll-caught fishery operating in international waters with overseas processing can carry the MSC label if the fishery passes the audit.

MSC certification is also granted at the fishery level, not the vessel level. A certified fishery includes all the boats operating under that fishery's management framework. The label on the can confirms the fish came from a certified fishery — not that a specific named vessel was audited and verified individually. For brands that want to go further than the MSC floor, vessel-level traceability requires additional transparency measures beyond what certification alone requires.

American Tuna holds MSC certification and goes further on every additional transparency dimension: named US fishing vessels, domestic processing, Pole & Line methods, and two-ingredient labeling. The MSC label is the verified baseline. The additional transparency is what separates the brand from others that have the same certification but less accountability behind it. Shop American Tuna to see the full product range.

MSC vs. Other Seafood Labels on the Market

The seafood labeling space has several certifications that appear alongside or instead of MSC, and understanding what each covers helps avoid confusion at the shelf. The Aquaculture Stewardship Council (ASC) is the MSC equivalent for farmed seafood — relevant for salmon, shrimp, and tilapia but not for wild-capture tuna. "Dolphin-safe" certification, governed by the Earth Island Institute in the US, confirms that fishing methods did not knowingly harm or kill dolphins — but it says nothing about bycatch of other species, fish stock health, or fishing method.

The Monterey Bay Aquarium's Seafood Watch program is not a certification but a recommendation guide — it ranks seafood choices as Best Choice, Good Alternative, or Avoid based on an independent assessment. Seafood Watch and MSC use overlapping but not identical criteria, and Seafood Watch rankings are updated more frequently than MSC certification cycles. Visit americantuna.com to see how American Tuna's sourcing practices compare against both frameworks.

Why MSC Certification Matters When You're Buying Canned Tuna Specifically

Canned tuna is the most consumed canned seafood in the United States, with Americans eating approximately one billion cans per year. The volume of fish involved in that consumption makes the sustainability of tuna fisheries a meaningful issue for ocean health — not a niche concern for specialty buyers. When commodity brands dominate that market with uncertified, high-bycatch sourcing, the cumulative effect on Pacific albacore stocks is real.

MSC certification in the canned tuna category is still not universal. StarKist, Bumble Bee, and Chicken of the Sea offer some MSC-certified products alongside non-certified lines. American Tuna's entire product line — every SKU — is MSC certified. The brand was built around a commitment to sustainable Pole & Line fishing by the founding families who operate the vessels, which means the certification reflects an operational reality rather than a marketing decision.

Frequently Asked Questions About MSC Certification

Does MSC certified mean the tuna is wild-caught?

Yes. MSC certification applies exclusively to wild-capture fisheries. Farmed seafood cannot hold MSC certification — that is the domain of the Aquaculture Stewardship Council (ASC). If you see the MSC label on a canned tuna product, the fish is wild-caught from a fishery that passed the MSC audit.

How long does MSC certification last?

Full MSC certification is granted for five years, with annual surveillance audits in between. Fisheries can lose certification during the surveillance cycle if conditions change materially — stock declines, changes in management, or bycatch problems that were not adequately addressed. The five-year renewal cycle requires a full re-audit.

Is MSC certification the same as organic certification for seafood?

No. Organic certification for terrestrial food products is governed by the USDA National Organic Program and involves specific rules about inputs, practices, and prohibited substances. MSC certification addresses wild-capture fishing sustainability — stock health, bycatch, and management — but does not govern what fish eat, how they are processed, or what is added during canning. It is a complementary credential, not an equivalent one.

Can a brand claim MSC certification without the fish actually being certified?

The chain of custody requirement is designed to prevent this. Every link in the supply chain — the fishery, the processor, and the retailer — must hold separate chain-of-custody certification to legally use the MSC label on a product. Auditors verify that certified fish is not mixed with non-certified fish at any point. Misuse of the label is a violation of MSC's trademark, and the organization actively monitors for unauthorized claims.