Every so often a story goes around: "farmed salmon is dyed orange, it would be grey otherwise." It lands because there's a kernel of truth in it, and it leaves a lot of people quietly afraid of the salmon in their fridge. So let's do what a curator should: explain it honestly, all the way down.

Here's the short version. Salmon flesh is pink-orange because of astaxanthin, a natural pigment the fish takes in through its diet. Wild salmon get it from eating krill and shrimp; farmed salmon get the same molecule through their feed. It is deposited into the muscle as a nutrient, exactly as it is in the wild, not brushed onto the surface. "Dyed" is a simplification. The accurate word is "diet."

That distinction matters, because once you understand where the colour comes from, the real questions get clearer: is the added pigment safe? What about antibiotics? Wild versus farmed? And how do you actually know a salmon is fit to eat? We'll take each one honestly, and show you where iBuddies fits in.

🧬 Why salmon is pink: the real science

The pigment has a name, astaxanthin, and a job. It's worth knowing both.

Astaxanthin is a carotenoid, the same chemical family as the pigments in carrots and tomatoes, and it's also an antioxidant. In the wild, salmon eat krill, shrimp and other crustaceans, which feed on algae that make astaxanthin. The pigment travels up the food chain and settles in the salmon's muscle. The very same mechanism is what turns flamingos pink. Without astaxanthin in the diet, salmon flesh would be pale grey-white.

Farmed salmon can't hunt krill, so the same nutrient is added to their feed. The Aquaculture Stewardship Council puts it plainly: there is no step in farming where salmon is dyed, and the "injected with dye" idea is a myth. Independent academics agree, salmon's colour comes from naturally occurring carotenoids such as astaxanthin in the feed.

So the honest, full picture: yes, un-pigmented farmed salmon would be paler, and yes the colour comes from a feed ingredient. But that ingredient is the same nutrient a wild salmon eats, metabolised into the muscle the same way. Calling it "dye" implies a surface coating, which simply isn't what happens.

🔬 Is the added pigment safe?

Short answer: at the regulated feed levels, yes, and it's been formally assessed.

In the EU, astaxanthin and the related carotenoid canthaxanthin are approved, regulated feed additives with legal maximum levels. The European Food Safety Authority (EFSA) reviewed synthetic astaxanthin in salmon and trout feed and concluded that, used up to the permitted dietary level, it is "of no concern for the safety of the consumer."

There's a hard cap, too: when astaxanthin and canthaxanthin are combined in fish feed, the limit is a maximum of 100 mg total per kg of complete feed. Astaxanthin is itself sold as a human food supplement and studied as an antioxidant, the trace amount carried in a portion of salmon is far below typical supplement doses.

The honest framing isn't "100% miracle nutrient." It's this: the colour in good salmon is a regulated, safety-assessed feed ingredient with a legal maximum, a controlled spec, not an unknown. The limits and the review are the reassurance.

💉 What about antibiotics?

This is the fair question behind the scare, and the answer is about standards, not colour.

Not all farmed salmon is equal. How much antibiotic is used depends enormously on the farming region and the standard it's held to. Some regions and lower-standard operations have used a great deal; the best-run operations have driven antibiotic use down to near-zero, largely by vaccinating the fish instead of medicating them.

That's the real takeaway, and it's why this whole article keeps coming back to one word: provenance. Knowing where your salmon comes from, and that the source is held to a strict, low-antibiotic standard, is the safety signal that actually means something, far more than the shade of the fillet.

🌊 Wild vs farmed: which is "better"?

Honestly? Neither wins outright. Both can be safe and nutritious, and "wild good, farmed bad" is out of date.

A government health authority notes both wild and farmed salmon are low in mercury and other contaminants and safe to eat. The honest hierarchy is standards and provenance, not a blanket "wild beats farmed."

📄 How you actually know it's safe: the health certificate

This is the part the scare headlines never mention, and it's the part that does the real work.

When salmon is imported, it doesn't just turn up. It travels with an official export health certificate, issued by the origin country's government food-safety authority, certifying the consignment is fit for human consumption and meets agreed sanitary standards. That's a government-to-government document, not a marketing claim a shop writes for itself.

On the Hong Kong side, the Centre for Food Safety (食安中心 / CFS) treats seafood as a higher-risk import category and requires that each consignment of imported food be accompanied by a health certificate from the issuing authority at the place of origin, proving it is fit to eat. CFS also draws samples at import points for chemical and microbiological testing. So "comes with a health certificate" means a real, verifiable control with a traceable origin.

iBuddies holds these health certificates for our salmon. We don't post them publicly, certificates carry consignment details, but we keep them on file and can verify privately if you ever ask. That's the difference between trusting a colour and trusting the paperwork behind it.

✅ How to judge salmon, in five quick checks

A simple shopper's checklist, now that you know what actually matters.

Where iBuddies comes in

We'd rather teach you what matters than sell you a scare, that's the whole point of a curator.

Our weekly chilled salmon comes direct from Norway, responsibly farmed under Norway's mature, well-regulated salmon-farming standards, a low-antibiotic, strictly-controlled source. Every import carries the official health certificate from the origin's food-safety authority, and clears Hong Kong's Centre for Food Safety import checks. We hold those certificates on file.

And it arrives fresh, chilled, three times a week, Tuesday, Thursday and Saturday, moved on dedicated cold-chain delivery so it reaches you in top condition. Looking for an alternative origin? We also carry NZ King Salmon Fillet.

References & Resources

The science and safety facts in this guide are drawn from the authorities below. Figures on feed-additive limits and consumer safety are from EFSA; import requirements are from Hong Kong's Centre for Food Safety. We keep the discussion of antibiotic use general and do not name any origin negatively. Last reviewed: 2026-06-15.

• Centre for Food Safety (食安中心 / CFS, FEHD), Hong Kong — import food control and the requirement that each consignment of imported food carry a health certificate from the issuing authority at the place of origin; seafood as a higher-risk import category: cfs.gov.hk
• European Food Safety Authority (EFSA) — scientific opinions on astaxanthin and canthaxanthin as feed additives for salmon and trout (consumer-safety conclusion; maximum 100 mg/kg combined in complete feed).
• Aquaculture Stewardship Council (ASC) — how salmon gets its colour, and salmon-farming myths (astaxanthin is dietary, not surface dye).
• The Conversation (academic authors) — salmon colour comes from naturally occurring carotenoids such as astaxanthin in feed.
• Nofima & peer-reviewed flesh-colour research — fillet colour-fan score tracks measured astaxanthin concentration in the flesh.
• Washington State Department of Health — both wild and farmed salmon are low in contaminants and safe to eat.