Bullhead Fishing UK: Where and How to Catch Bullhead

How to identify a bullhead

The Bullhead is unmistakable once seen. It has a very large, broad, and flattened head which tapers sharply to a slender, scaleless body. Its colouration is a mottled brown and grey, providing superb camouflage against a gravel riverbed. The pectoral fins are large and fan-like, used to brace itself in strong currents. It has two separate dorsal fins, the first being spiny. Crucially, it lacks the barbules around the mouth that are present on the similarly-sized Stone Loach. Its eyes are positioned high up on its head, giving it a good field of view for spotting prey and predators from its position on the bottom.

Where it lives

This species demands clean, cool, and well-oxygenated water, making it a reliable indicator of unpolluted environments. Its primary habitat is the fast-flowing, stony riffle sections of upland streams, brooks, and small rivers across the UK. It is a benthic fish, living its entire life on the bottom, where it seeks refuge under stones, rocks, and amongst coarse gravel during daylight hours. While predominantly a riverine species, populations also exist in the stony littoral zones of some oligotrophic lakes, such as those found in the Lake District and parts of Scotland. It is absent from slow-moving, silted, or polluted waters.

What it eats and the best baits

The Bullhead is an ambush predator, feeding primarily on benthic invertebrates. Its diet consists mainly of freshwater shrimps (Gammarus), the larvae of caddisflies, mayflies, and stoneflies, and various aquatic worms. It is highly opportunistic and will also prey on fish eggs, fish fry, and even smaller Bullheads. They hunt mostly at night, using their excellent camouflage to remain hidden amongst the stones on the riverbed before lunging at any prey that comes within range. Their large mouth allows them to consume surprisingly large food items.

Worm fragment
Maggot
Caster
Small nymph fly

Best time of year

Jan – quieter
Feb – quieter
Mar – quieter
Apr – good
May – good
Jun – good
Jul – good
Aug – good
Sep – good
Oct – good
Nov – quieter
Dec – quieter

As a coarse fish, the Bullhead is subject to the statutory close season on rivers in England and Wales, which runs from 15th March to 15th June inclusive. There is no equivalent national close season in Scotland, though local regulations may apply.

How to catch bullhead

The Bullhead is a protected species in the UK and it is illegal to intentionally target it. Therefore, there are no legitimate angling techniques for this fish. It is occasionally caught by accident, most often by anglers using small baits like worm sections or maggots while fishing for trout, grayling, or other small river species. Fly fishers also sometimes hook them by mistake when fishing nymphs deep along the riverbed. If you do catch one, it is a legal requirement to return it to the water immediately. Handle the fish as little as possible, always with wet hands to protect its sensitive, scaleless skin, and ensure it is released unharmed in the area it was caught. Never use a keepnet.

Legal notes

The Bullhead is a protected species in the UK. It is listed on Schedule 5 of the Wildlife and Countryside Act 1981 and as a European protected species. It is a criminal offence to intentionally kill, injure, take, possess, or sell them without a specific licence. Anglers catching one by accident must return it to the water immediately and unharmed.

Rules change. Check current Environment Agency, NRW or Scottish regulations and the venue's own rules before fishing. Not professional or legal advice.

Where to catch bullhead in the UK

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Bullhead fishing questions

Is it illegal to fish for Bullheads in the UK?

Yes. The Bullhead is a protected species and it is an offence to intentionally target, kill, injure, or take them without a specific licence. Accidental captures must be returned to the water immediately.

Why is it called a Miller's Thumb?

Its broad, flattened head is said to resemble the thumb of a traditional flour miller, which could become squashed and flattened through years of testing the texture of ground flour.

How can I tell a Bullhead from a Stone Loach?

The Bullhead has a much wider, flatter head and lacks the six barbules (whiskers) around the mouth which are prominent on a Stone Loach. A Bullhead's body is also scaleless.

What should I do if I accidentally catch a Bullhead?

You must return it to the water immediately. Handle it with wet hands to protect its scaleless skin, unhook it as quickly and carefully as possible, and release it gently back into the water.

Are Bullheads a sign of good water quality?

Yes, their presence is a very reliable indicator of a healthy, unpolluted aquatic environment, as they require clean, cool, and highly oxygenated water with a stony substrate to thrive.