Crayfish Trapping Rules in the UK

By Alex Clayton · Updated 23 October 2026

Signal crayfish are an invasive pest, yet setting a single trap for them in England without written Environment Agency permission is an offence you can be prosecuted for. There is no crayfish licence to buy. In England you need free written EA permission, tagged traps, and consent from the landowner and any angling club. In Wales, Natural Resources Wales does not authorise trapping signals to eat or sell.

Below: who to ask in each nation, the legal trap size, what to do with a crayfish you catch by accident, and whether you can eat signal crayfish.

Do You Need a Licence to Trap Crayfish? The Rules by Nation

Most crayfish advice online assumes you live in England. The rules differ across the UK, and for Scotland and Northern Ireland we found no official trapping guidance at all.

Nation	Can you trap crayfish?	Who to ask
England	Only with free written EA permission, a tag on every trap, and landowner and angling club permission	Environment Agency
Wales	NRW does not authorise trapping signals for personal consumption or sale; occasionally for research or management	Natural Resources Wales, 0300 065 3000
Scotland	No official guidance found. Ask before you set anything	Your local District Salmon Fishery Board or fishery trust
Northern Ireland	No official guidance found. Ask before you set anything	DAERA Inland Fisheries

The native white-clawed crayfish is a separate case. It is protected, and in England it is trapped only for scientific purposes under a Natural England licence.

For rod licences, seasons and methods, see our UK fishing rules hub.

How to Get Environment Agency Permission to Trap Crayfish

EA permission costs nothing, and you apply online (the form replaced the old PDF version on 31 March 2026).

Get landowner and angling club permission first.
Gather the details the form asks for: site location and grid reference, size and type of water, any conservation designation, when and why you want to trap, your methods, the number and size of traps, and the species.
Check your traps meet the size limits in the next section.
Apply online through the GOV.UK crayfish trapping page.
If approved, fit the tags that come with your authorisation, one on each trap whenever it is in use.

Fyke nets, drop nets, hand nets, artificial refuge traps and catching by hand need permission too. Return any fish not on your authorisation to its water straight away, with as little damage as possible.

The EA approves permits only in very specific circumstances. For help, email fmapplications@environment-agency.gov.uk or ring 0208 474 5243 (Monday to Friday, 9am to 5pm). If you only want a few for the pot, ring your local fisheries officer on 03708 506 506 before you buy a trap, and read our freshwater fishing rules in England.

Legal Crayfish Trap Sizes and the Water Vole Rule

A trap that is legal to buy is not necessarily legal to set. The EA’s approved design is specific:

Rule	Limit
Length	No longer than 600mm
Width at widest point	No wider than 350mm
Entrance	No more than 95mm wide, unless an otter guard is fitted
Mesh	No bigger than 30mm
Tag	EA-issued trapping tag attached whenever in use

Measure any trap you already own against that table before you apply.

Water voles can sink an application. The EA can refuse permission where voles are at risk, and recklessly letting a vole drown in a trap, or setting one in a vole tunnel entrance, is an offence. On vole banks a baited drop net may be allowed instead of an enclosed trap, so ask your local fisheries officer.

Signal Crayfish vs White-Clawed Crayfish: Which You Can Touch

The crayfish you may remove and the one you must never harm can live in the same river.

Signal crayfish are a North American invasive, listed as an invasive alien species on 3 August 2016 and classed as widely spread. You must not release one into the environment, or let it breed or escape.

White-clawed crayfish are the native species, and they are protected. Harming or removing one is an offence, and they are trapped only for science under a Natural England licence.

The two are not always easy to tell apart on a wet bank. If you are not sure which you are holding, return it alive to the exact spot you caught it.

More on the species anglers must not spread is in our invasive species rules for anglers.

Caught a Crayfish by Accident? What to Do on the Bank

A signal has clamped onto your hookbait, and a forum offers three different answers. The GOV.UK guidance for England and Wales sets out this order:

Not sure of the species? Return it alive where you caught it.
Sure it is a listed invasive, such as a signal, and able to kill it humanely? Do so. Do not take it home alive.
Cannot kill it humanely? Release it immediately at the exact place it was caught. Never move it to another water or another spot.
Report the sighting on iRecord.

You may read that a signal can never go back, or that you can carry one alive to the car in a sealed box. The official guidance says otherwise on both counts.

The rule of thumb: dead, or back exactly where it came from. Never alive in your bag.

Can You Eat Signal Crayfish? Keeping and Taking Them Home

Yes, but the law cares about where they die.

In England, with permission to trap, crayfish humanely killed on the riverbank can be taken away to eat at home. Live ones must not be taken away, so kill them where they are caught.

The only exceptions are a licence to keep them live for commercial processing in England, or a permit for research or conservation. In some areas, keeping non-native crayfish alive also needs a Cefas Fish Health Inspectorate licence under the Prohibition of Keeping of Live Fish (Crayfish) Order 1996.

In short, eating signals works for permitted anglers in England who dispatch them on the bank. It does not work in Wales, where NRW does not authorise trapping to eat, or for anyone who hoped to keep a tank of them in the garage.

Why Northern England Says No, and What Illegal Trapping Costs

Trapping signals can increase their numbers, say both the EA and NRW, because traps remove the larger crayfish that prey on smaller ones.

Crayfish plague also travels between waters on traps, kit and clothing, so the EA does not permit commercial trapping for human consumption in northern England. In a 2023 warning to Yorkshire anglers, it said setting traps without explicit written permission is an offence.

In July 2025, Newcastle magistrates fined a man who set four traps on the River Blyth £140, plus £500 costs and a £56 surcharge, under the Salmon and Freshwater Fisheries Act 1975. His equipment was destroyed. He said online videos had encouraged him and he thought trapping helped nature (EA case report).

Check, clean and dry kit, clothing and footwear between waters. Report illegal traps to the EA hotline on 0800 80 70 60 (24 hours). Trapping permission does not give you access to the bank, so check where you can fish legally.

Frequently asked questions

Do I need a licence to catch crayfish in the UK?

In England you need free written Environment Agency permission, an EA tag on every trap, and landowner and club consent. Wales does not authorise trapping signals for eating. In Scotland, ask your District Salmon Fishery Board or fishery trust; in Northern Ireland, ask DAERA Inland Fisheries.

Does my rod licence cover crayfish fishing?

No. A rod licence does not let you trap or remove crayfish. In England that needs separate written permission from the Environment Agency, which is free and applied for online.

Can I put a signal crayfish back in the river?

Only if you cannot kill it humanely or are unsure of the species, and only at the exact spot you caught it. Never release one anywhere else. If you are sure it is a signal and can kill it humanely, do that, then report the sighting on iRecord.

Can I keep signal crayfish alive at home?

No. Live crayfish must not be taken away from where they were caught, unless you hold a licence for commercial processing or a permit for research or conservation. In England, with permission to trap, kill them on the bank if you intend to eat them.