Farmed or wild salmon — which should I buy?

The farmed-versus-wild question gets argued as though one is simply better. In the kitchen they behave differently enough that they are almost different ingredients, and the environmental comparison is genuinely unresolved rather than obvious in either direction.

Step by step

1. Assume salmon on a UK shelf is farmed unless it says otherwise.Atlantic salmon is farmed — Scottish, Norwegian, Faroese, Chilean. Wild salmon in UK shops is nearly always Pacific: sockeye, king, coho, pink, mostly from Alaska, and usually frozen or tinned.
2. Compare them on fat, because that drives everything else.Farmed salmon carries considerably more fat, laid down in thick white seams. That fat bastes the fillet from inside, which is why farmed salmon survives a couple of extra minutes in the oven and wild salmon does not.
3. Expect different colour and flavour.Wild sockeye is deep red and strongly flavoured. Farmed Atlantic is pale orange-pink and mild. The colour in both comes from astaxanthin — wild fish get it from their diet, farmed fish get it added to feed, which is why farmers specify a colour on a fan chart.
4. Cook them differently.Farmed salmon takes hot dry heat well: roast it, pan-fry it skin-down, barbecue it. Wild salmon is lean and dries out at the same doneness, so cook it less, or poach, cure or hot-smoke it instead.
5. Judge sustainability at farm and fishery level, not category level.Some salmon farms score well and some badly on sea lice, escapes, benthic impact and feed sourcing. Some wild fisheries are well managed and some are not. The Marine Conservation Society's Good Fish Guide rates them individually, which is more use than a blanket rule.
6. Weigh the price difference honestly.Wild salmon is typically several times the price. If it is going into a fishcake, a pie, a pasta sauce or a curry, that premium buys nothing you will taste. Save it for a piece you are serving plainly.
7. Consider frozen wild and tinned wild.Frozen-at-sea wild sockeye and tinned wild red salmon are far cheaper than the fresh counter equivalent and lose very little. Tinned wild salmon, bones included, is one of the best value proteins in a UK supermarket.

Tips

• The white stuff that oozes out during cooking is albumin, a protein squeezed out as the muscle tightens. It is harmless and mostly a sign the fish went too hot or too long — more common on farmed fillets because they contain more of it.
• Organic farmed salmon means lower stocking density, organic feed and no synthetic colourants. It costs more and is a genuine difference, unlike most premium salmon labelling.
• Sea trout is worth knowing about: wild, in season in summer, closer to salmon than to brown trout, and often cheaper than wild salmon.
• If a recipe was written for wild salmon and you are using farmed, take two or three minutes off. If it was written for farmed and you have wild, take more off than that.

Common mistakes

• Buying wild salmon and cooking it to the same doneness as farmed — It has far less fat to hide behind, so it goes chalky and dry at a point where farmed salmon would still be moist. Expensive fish ruined by a timing habit.
• Treating wild as automatically the greener choice — Wild Pacific salmon is flown or shipped from Alaska and some runs are under pressure; some farms are well-run and some are not. The rating is per fishery and per farm, and it changes year to year.

Alternatives

• Sea trout: Wild, summer season, pink-fleshed and closer to salmon than trout. Often better value than wild salmon and cooks the same way.
• Rainbow trout: Farmed, cheap, mild and widely available. Behaves like a small salmon and suits every salmon method except long roasting.
• Arctic char: Farmed, between salmon and trout in fat and flavour. Excellent pan-fried skin-down and usually cheaper than wild salmon.
• Tinned wild red salmon: Wild sockeye at a fraction of fresh prices. Excellent in fishcakes, pasta and on toast, and the soft bones are edible and worth eating.

Questions people ask