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When a familiar Mediterranean fish is unavailable, expensive, or a sustainability concern, don’t replace it using a species-wide “good” or “bad” list. Check the exact species, where it came from, how it was caught or farmed, and what current guidance says about that fishery or farm. Sustainability can differ within a species.
What the latest regional picture says—and does not say
The Mediterranean and Black Sea show both progress and ongoing pressure. In its 2025 reporting, FAO/GFCM said fishing pressure had fallen by half over the previous 10 years. Biomass of assessed commercial species rose 25 percent between 2013 and 2023, across 120 assessed stocks. Yet 52 percent of those assessed stocks remained overfished, down from 87 percent a decade earlier. These figures describe assessed regional stocks, not every local population or seafood product. FAO/GFCM’s 2025 regional assessment was published on 28 November 2025.
Species trends are not interchangeable. FAO/GFCM reported signs of biomass depletion in sardine stocks, while European hake showed modest recovery with substantial variation among subregions. Neither finding justifies a universal buy-or-avoid rule: the relevant stock, fishing area, and current local recommendation matter.
A practical way to compare seafood choices
- Identify the fish precisely. Ask for the commercial name and, where available or required, the scientific name. Common names can refer to different species; a precise name makes a guide or stock assessment more useful.
- Find the origin. Ask where the fish was caught or, for farmed seafood, the country or area where it was produced. “Mediterranean” may not identify the specific management area or source you need to assess.
- Ask how it was produced. For wild-caught fish, find out the fishing gear category if available. For farmed fish, ask about the production method and sourcing. Do not treat “farmed” as a sustainability rating on its own.
- Check a current seafood guide for the relevant market. Recommendations can differ by stock, farm, catch method, and geography. A guide written for another country may not apply to the seafood sold where you live. WWF-UK’s seafood tips also recommend asking where seafood comes from and how it was caught or farmed.
- Compare like with like. If you have several options, compare species and stock or farm, catch area or farming country, production method, current assessment, and traceability. A local label or a familiar species name does not establish that the source is well managed.
- Choose an alternative only after checking it, too. Variety can take pressure off popular choices, but a substitute is not automatically a better choice. WWF gives mussels as a possible lower-impact alternative to farmed shrimp; that example is not a blanket recommendation for every mussel source or market.
- Use season and locality as extra clues, not proof. Seasonal or local seafood may be worth considering, but still check the source, method, and relevant guidance.
What seafood labels can tell you in the EU
For covered products offered to consumers or mass caterers in the EU, Regulation (EU) No 1379/2013 sets out information requirements that can include the commercial and scientific species names, production method, catch area or farming area, and fishing gear category for wild-caught fish. Covered labels must also indicate whether a product has been defrosted, subject to the regulation’s scope and exceptions. Requirements differ for processed products, so do not assume a can or prepared dish must display the same full set of details. See the EU regulation and the European Commission’s seafood markets information.
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For products outside the EU, check the rules that apply in your market. Wherever you shop, if the label is unclear, ask the retailer for the exact species, origin, and catch or farming method. If they cannot provide those details, you have less information with which to verify a sustainability recommendation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to interpret certifications and farmed seafood
A certification is evidence about the assessed source, not an endorsement of every fish of that species. The Marine Stewardship Council says its certification applies to individual fisheries; assessment considers population health, wider ocean impacts, and management. Check that the product’s source matches the fishery covered by a certification rather than extending that verdict to the species as a whole. See MSC’s explanation of sustainable species.
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Farmed seafood also needs source-specific scrutiny. FAO/GFCM reported that marine and brackish aquaculture produced 940,000 tonnes in 2023, more than 45 percent of regional aquatic food production. Gilthead seabream accounted for 34.5 percent and European seabass for 29.7 percent of regional aquaculture output. Those production shares do not establish that a particular farm is sustainable. FAO/GFCM identified environmental impacts, animal health, and biosecurity as ongoing aquaculture challenges.
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A quick checklist at the counter
- Do I know the exact species, not just a broad or local name?
- Can I identify the catch area or farming country?
- Do I know whether it is wild-caught or farmed and, where available, the gear or production method?
- Does a current guide for my market recommend this specific source?
- If I am switching to another fish or shellfish, have I checked that option on the same terms?
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