Lugworm: Digging, Storing and Fishing It

By Alex Clayton · Updated 23 October 2026

Lugworm are marine worms that live in U-shaped burrows in intertidal sand and mud. Anglers dig them at low tide with a fork or buy them from a tackle shop, and they are a staple bottom bait for UK shore fishing. Southern IFCA lists lugworm and ragworm as the commonest bait worms collected in the Solent and Poole Harbour.

Two things trip people up. Two different worms get sold as “lug”, and the rules on digging them change from one stretch of coast to the next.

Below: telling black lug from blow lug, finding and digging lugworm bait, the legal position, keeping it fresh and fishing it.

Black Lug vs Blow Lug: How to Tell Them Apart

Black lug and blow lug look different enough to dig separately, yet black lug was only formally described as its own species in 1993, when Cadman and Nelson-Smith named it Arenicola defodiens. Before that, it was filed under the common lugworm.

Blow lug (Arenicola marina) is the smaller and paler of the pair, growing to about 13 cm long and 1 cm wide. Devon and Severn IFCA names it, alongside king ragworm, as one of the two main species dug for bait in its district.

Black lug grows larger and is generally much darker, so it puts more bait on the hook.

You can usually tell which one is below you before you lift a fork. Look at the cast, the pile of sand the worm pushes out of its burrow.

	Blow lug	Black lug
Scientific name	Arenicola marina	Arenicola defodiens
Colour	Paler	Generally much darker
Size	Up to about 13 cm	Larger
Cast shape	Jumbled, untidy pile	Neat spiral

Which should you dig? Whichever your local flats hold. Both catch fish, and no source shows one outfishing the other. Black lug gives you a bigger bait; blow lug does the same job in a smaller size.

Quick comparison: a jumbled cast usually means blow lug below; a neat spiral points to black lug.

Where to Find Lugworm and How to Read the Casts

Digging straight down on a cast is how you end up with half a worm. The cast is only one end of the burrow.

Lugworm live on intertidal mud and sandflats, mainly in estuaries and on some beaches. Devon and Severn IFCA gives the Severn, Tamar, Plym and Exe estuaries and the Torbay beaches as examples of where digging happens in its district. Southern IFCA puts most bait collection in its area in the Solent and Poole Harbour.

Each worm sits in a U-shaped burrow that leaves two marks on the surface:

The cast: a coiled pile of sand marking the tail shaft, where the worm pushes out waste.
The dip: a small saucer-shaped depression about 5 to 8 cm away, marking the head shaft where the worm feeds.

The worm lies at the bottom of the U, between the two.

The flats are only exposed and diggable around low water, so plan every trip around the local tide table. Watch the incoming tide while you dig, and stay off soft mud you haven’t walked before, because it can be far deeper than it looks.

If a beach is new to you, walk it at low water first and note where the casts are thickest before you bring a fork.

How to Dig Lugworm Without Wrecking the Beach

The habit that keeps a digging ground worth visiting is also the easiest one: fill your holes in.

Kit is minimal. Devon and Severn IFCA describes bait digging as fork work on the flats, so a sturdy bait fork and a bucket or tray cover it.

To dig lugworm cleanly:

Pick a cast and find its matching head-shaft dip.
Dig beside and between the two marks, not straight down the cast.
Work quickly, lifting the sand in clean forkfuls so you don’t snap the worm.
Take whole worms only and put them straight into your bucket.
Backfill the hole before you move to the next cast.

Then follow the local code. The Poole Harbour Bait Digging Agreement is a clear example, and it asks diggers to:

backfill all holes
take only what they need
avoid taking green, spawning worms
keep off seagrass beds and use access paths
avoid digging around moorings, slipways and sea walls
avoid marked bird-sensitive areas in winter
remember that torch use can disturb roosting birds
follow all local byelaws

That is the Poole code. Other areas have their own, which the next section covers.

The reason is practical. Devon and Severn IFCA notes that digging removes worms, affecting their abundance and population structure, and can change the structure of the sediment itself. At Boulmer in Northumberland, anglers have raised concerns about over-exploitation, particularly by commercial collectors. Fewer worms on the flat means less bait next time, and visible damage gives authorities a reason to step in.

The verdict: dig between the cast and the dip, take only what you will fish, and leave the flat level behind you.

Is Bait Digging Legal? Rules Vary by Coast

“Can I dig lugworm here?” has a different answer in Poole Harbour than on the Northumberland coast.

Research for this guide found no single national bait-digging rule for England. Instead, the Inshore Fisheries and Conservation Authority (IFCA) for each district sets its own byelaws, and landowner, harbour and protected-site rules (SSSI, MCZ, SPA) can apply on top.

Four examples:

Southern IFCA: its byelaw “Prohibition of Gathering (Sea Fisheries Resources) in Seagrass Beds” bans digging for or taking sea fisheries resources in prohibited areas. Its Bait Digging Code of Practice also restricts or prohibits digging in parts of Poole Harbour (Southern IFCA shore gathering).
Poole Harbour: the Poole Harbour Bait Digging Agreement rules out digging all year in Holes Bay north of the railway bridge or in seagrass beds. Diggers are asked to avoid the rest of Holes Bay in January and February, and bird-sensitive areas from 1 November to 30 March inclusive. Commercial diggers need landowner permission. The harbour is an SPA, SSSI and Ramsar site.
Devon and Severn IFCA: it surveyed digging in the Axe, Otter, Dart, Erme and Devon Avon estuaries, designated as MCZs in May 2019, because digging can affect intertidal sediment features (D&S IFCA survey note). As of 2020 it was developing a hand working permit byelaw; check its current status with them before you dig.
Northumberland IFCA: in June 2025 its technical committee found digging at Boulmer stable since a 2020 peak, with no extra management justified yet, but monitoring and winter patrols continuing (NIFCA committee summary).

Outside England, check with the fisheries authority for Wales, Scotland or Northern Ireland. Some codes also treat commercial and personal digging differently.

Before you dig a new beach, check that coast’s IFCA website and any local code, then follow the signs on the ground.

Keeping Lugworm Fresh, and When to Buy Instead

A bucket of lug left in a warm car is a bucket of wasted effort. Dead and broken worms spoil fast and can take the rest of the batch with them.

The general rules:

Keep the worms cool and moist.
Keep them out of the sun, on the beach and on the way home.
Pick out broken or dead worms as soon as you spot them.

Dig or buy? Digging is free and gives you the freshest bait, but it is tied to the tide, the weather and local restrictions. Tackle shops sell lugworm fresh and frozen, which covers the days you can’t reach the flats. Ask how fresh the bait is and how it has been kept before you pay.

Quick comparison: dig for the freshest, cheapest bait; buy when time, tide or local rules won’t let you.

How to Fish Lugworm: Hooks, Rigs and Target Species

One bait, a modest range of hook sizes and two rigs cover most of what lugworm catches from the shore.

Common practice is a size 1 to 3/0 hook on a pulley rig or a two-hook flapper. Treat that as a starting range, not a rule: go smaller for flatfish and larger when you are fishing a bigger bait for cod.

To present it:

Thread the worm up the hook shank and over the eye, so the bait sits straight.
Put two or more worms on the same hook for bigger fish.
Tip off with a different bait if you want a combination bait.

Lugworm is widely used for bottom feeders such as cod, dabs, flounder, plaice and whiting. It is a popular choice in the colder months, when shore anglers turn to cod fishing and dabs.

Against the other big sea baits: ragworm is the other main bait worm dug on UK flats, and both IFCAs quoted above name it alongside lug. Peeler crab is the bait many anglers switch to when the crabs are moulting. For the wider picture, see our guide to sea fishing bait.

Start with a single big lugworm on a size 1 or 1/0 hook on a pulley rig, and adjust from there.

Frequently asked questions

Do you need a licence to dig lugworm?

Research for this guide found no single national licence for recreational lugworm digging in England. Local IFCA byelaws, codes, landowners and protected-site rules apply instead, and some areas restrict or ban digging, such as Southern IFCA's seagrass byelaw. Check with the IFCA for your coast, and any harbour or landowner code, before you dig.

What is the difference between black lug and blow lug?

Black lug (Arenicola defodiens) is larger and generally much darker, and it leaves a neat spiral cast. Blow lug (Arenicola marina) is smaller and paler, with a jumbled cast. See Black Lug vs Blow Lug above for the full comparison.

When is the best time to dig lugworm?

Dig around low tide, when the flats are exposed, and check local tide times before you go. In winter, some codes ask diggers to avoid bird-sensitive zones. In Poole Harbour, that applies from 1 November to 30 March inclusive.

What fish can you catch on lugworm?

Lugworm catches bottom feeders such as cod, flounder, dabs, plaice and whiting from beaches, estuaries and piers. It is especially popular in the colder months, when cod and dabs are a common shore target. See How to Fish Lugworm above for hook sizes and rigs.