Haddock
By Alex Clayton · Updated 23 October 2026
Haddock fish is one of Britain’s best-known eating fish, yet very few anglers ever catch one from the shore. The reason is depth. Haddock (Melanogrammus aeglefinus) are a cod-family fish of deep, cold water, and most rod-caught fish come to boat anglers off north-east England and Scotland.
This guide to UK sea fish species covers how to identify a haddock, its size and the British records, where it lives, how to catch it and the minimum size rules that apply.
How to Identify a Haddock (and Tell It from Cod and Whiting)
Learn two marks and you will not confuse a haddock with anything else in the fish box.
Like the rest of the cod family, haddock have three dorsal fins. What sets them apart is:
- A black lateral line running the length of the body.
- A dark thumbprint blotch just above the pectoral fin.
The fish most often mistaken for haddock compare like this:
| Species | Lateral line | Other quick check |
|---|---|---|
| Haddock | Black | Dark thumbprint above the pectoral fin |
| Cod | Pale | Mottled body, no thumbprint |
| Pollack | Dark, curved over the pectoral fin | Lower jaw juts out past the upper |
| Coalfish | Pale and straight | Dark body, no thumbprint |
| Whiting | Pale | Slim, silvery, dark spot at the pectoral fin base |
Getting the ID right matters because minimum sizes and record claims are species-specific. For the look-alikes in more detail, see our guides to cod and pollack, and our sea fish identification guide for everything else that comes up on a boat.
If the lateral line is black and there is a thumbprint, it is a haddock.
Haddock Size and the British Records
The British boat record for haddock dates from 1978, and it can no longer be beaten on weight.
Haddock grow to about 80cm and around 17lb (8kg), though rod-caught fish are usually far smaller. Ignore online claims of 4ft fish; none of the angling sources checked for this guide support them.
The British Record (rod-caught) Fish Committee (BRFC) listings show:
| Record | Weight | Angler and year |
|---|---|---|
| Boat | 13lb 11oz 4dms (6.215kg) | G Bones, 1978, Falmouth |
| Shore | 6lb 12oz (3.061kg) | G B Stevenson, 1976 |
The rules for boat records have since changed. The BRFC froze its weight-based boat records in June 2024, and boat claims are now judged on length. The BRFC sea fish listing dated 18 June 2026 gives a qualifying length of 70cm for haddock. Check the current listing on the Angling Trust site before you make a claim, because the criteria can change between editions.
The shore record is roughly half the boat record, a fair measure of how much bigger the offshore fish run.
Where Haddock Live in UK Waters
If you fish from the shore and have never seen a haddock, the fish is the reason, not your tactics. They rarely come that close.
Haddock live over softer seabeds at depths from about 10m to 300m, and they prefer deep, cold water, usually 50m or more. The haddock fish feeds on the bottom on worms, brittlestars, molluscs and sandeels, which is why the baits in the next section work.
That makes haddock fishing in the UK a northern boat game. Most are caught in deep water off north-east England and around northern and western Scotland, often as a bonus while anglers are targeting cod. The occasional shore fish comes from rough ground beside strong tidal races, but these are exceptions.
Timing varies by area, so local charter skippers are the best guide to when haddock show on their grounds.
Best for: boat anglers fishing deep water in the north. Skip if: you fish from the shore and want a reliable target; bass is a far better bet.
How to Catch Haddock: Baits, Hooks and Rigs
Drop your hook size and you will hook more haddock.
Haddock have small mouths, so the big hooks many anglers use for cod can miss their bites. UK and Irish sea angling guides give a simple approach:
- Fish a simple baited rig hard on the bottom over soft ground in deeper water.
- Bait with mussel, lugworm or strips of fish. These match the worms and molluscs haddock already feed on.
- Keep hooks below 4/0 so they fit a haddock’s mouth.
- Use a 12 to 20lb class boat outfit.
Pirks, feathers and plastic worms or eels will also take haddock, but they are less effective than they are for cod. Save the lures for the cod and give haddock a bait on the bottom.
On a mixed boat day, set up one rod with smaller hooks and shellfish or worm bait. Haddock often turn up as a bonus while the boat is fishing for cod, and a scaled-down rod gives you a better chance of hooking them when they do.
The short version: small hooks, shellfish or worm, and keep the bait hard on the bottom.
Haddock Minimum Size and Stock Status
Search for a haddock minimum size and you will find conflicting figures, including a larger one that does not match the byelaws checked for this guide.
In England, minimum sizes for sea angling are set by each Inshore Fisheries and Conservation Authority (IFCA), and not every district uses the same figures. The two checked here both list 30cm:
- Kent and Essex IFCA: 30cm.
- North Western IFCA: 300mm.
Check your local IFCA before keeping a fish. In Scotland, check with the Marine Directorate; in Wales and Northern Ireland, check with the relevant fisheries authority.
The stock news is good. The Scottish Government’s proposed haddock fisheries management plan reports the North Sea and west of Scotland spawning stock well above MSY Btrigger (the level below which managers would act to rebuild it), after strong 2019 and 2020 year classes. Fishing pressure is at a historical low.
If in doubt, measure the fish, and return anything close to the limit.
Frequently asked questions
Can you catch haddock from the shore in the UK?
Rarely. Haddock are deep, cold-water fish, and only the occasional one comes from rough shore ground beside strong tides. The British shore record of 6lb 12oz (3.061kg) dates from 1976. For a more realistic shore target, try bass.
What is the minimum size for haddock?
It is 30cm in the Kent and Essex and North Western IFCA byelaws. Sizes can vary between IFCA districts, so check your local IFCA before keeping one. In Scotland, check with the Marine Directorate, and in Wales and Northern Ireland, the relevant fisheries authority.
What is the difference between haddock and cod?
Haddock have a black lateral line and a dark thumbprint above the pectoral fin. Cod have a pale lateral line and a mottled body with no thumbprint. Haddock are also the smaller fish, with a smaller mouth. Our sea fish identification guide covers the other look-alikes.