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Full haddock guide
How to spot it, where it lives, how it is caught and how to cook it — the complete guide, in one easy read.
Haddock might be the most useful fish in the British kitchen. Cod's slimmer cousin, it wears a dark thumb print behind the gill and turns its hand to almost anything: battered, poached in milk, or smoked to pale gold. It is the smoking that makes it special, though, and a fillet of real, naturally smoked haddock opens up a whole run of proper comfort food.
How to spot it
A haddock wears a dark, almost-black lateral line down a pale, silvery flank, the reverse of the pollock, which carries a pale line over a darker body. The back is a soft grey-brown above a clean white belly, and the body runs slimmer and more tapered than a cod's. The chin barbel is barely there, unlike cod's prominent whisker. Its best-known feature is the dark shoulder mark, often called the thumb print, just behind the gill. At a typical 38 to 69cm, it is smaller and finer in the flesh than cod, and a touch sweeter on the plate.
Where it lives
Haddock are bottom-dwellers, feeding close to the seabed over clean sand, gravel and mud, and they are found all around the UK. They favour cool, deeper water and turn up most abundantly in the North Sea and off Scotland. You can catch them year-round, though they are at their best through the cooler months, roughly autumn into early spring, when the cold water suits them and the flesh firms up. As a close cousin of the cod they share much of the same ground, but haddock keep to those deeper, cooler patches where the bottom is clean.
Catching it
Haddock come to a simple baited rig fished hard on the seabed, where they feed. A flowing trace or paternoster, usually worked from a boat over clean sand, gravel or mud, sets the bait right in front of them. The baits to trust are lugworm, peeler crab, squid or mackerel, all of which sit well on the bottom and tempt a feeding fish. Target the cooler months over deeper, clean ground for the steadiest sport. Stocks vary by area, so fish responsibly: respect size and bag limits (the minimum size is 30cm), return undersized or surplus fish carefully, and favour well-managed grounds.
In the kitchen
Haddock has white, flaky flesh that batters into a proper chip-shop supper, but smoking is where it truly comes alive. Smoked, it becomes pale-gold Finnan haddie or the famous Arbroath smokie. Poach a fillet gently in milk for breakfast, flake it through a kedgeree, or simmer it into a Cullen skink that warms you to the bones. To fillet a whole haddock, cut behind the head, run the knife along the backbone to the tail, then skin and pull any pin bones with tweezers. One rule when buying: choose the naturally smoked, dull-gold fillets over the bright-yellow dyed kind. Lean and high in protein, haddock is genuinely good for you. Smoke your own over real oak, or seek out an undyed, pale-gold fillet from a proper smokehouse, rather than settling for the bright-yellow dyed stuff.
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FAQs
Quick fish questions
Short answers for the questions families and coastal readers often ask first.
Where can you buy smoked haddock online?
Seek out naturally smoked, undyed haddock: dull-gold fillets with a clean, smoky smell rather than the bright-yellow, artificially coloured kind. A proper fishmonger or smokehouse is your best bet, as the real thing is smoked over wood, not dyed.
Is smoked haddock already cooked?
It depends. Most smoked haddock is cold-smoked, which means it still needs cooking, by poaching, grilling or baking. Hot-smoked types are cooked during the smoking and are ready to eat as they are.
Is haddock good for you?
Yes. Haddock is lean, low in fat and high in protein, with useful minerals such as selenium and B vitamins. Poached or baked rather than battered, it is one of the lighter, more nourishing white fish you can eat.
How do you fillet a haddock?
Cut behind the head down to the backbone, then run the knife flat along the bone from head to tail to free each fillet. Skin it if you like, then feel for pin bones along the centre line and pull them with tweezers.
Why is some smoked haddock bright yellow?
The bright-yellow colour usually comes from dye rather than the smoking itself. Choose naturally smoked, dull-gold fillets instead; the colour is gentler and the flavour comes from real smoke, not artificial colouring.
Is haddock the same as cod?
No, though they are close cousins in the cod family, so they look and cook alike. Haddock is smaller and finer-fleshed with a touch more sweetness, while cod grows larger with big, meaty flakes.