Bullhead
Cottus gobio
Also known as: Freshwater Sculpin, Miller's Thumb, Sculpin, European Bullhead
About This Species
A small, bottom-dwelling fish of clean, gravel-bedded streams and stony lake margins across much of Europe, spending the day hidden under stones and emerging to feed on invertebrates after dark. Its mottled brown camouflage and flattened head make it easy to overlook, so it is most reliably found by carefully turning stones in shallow, fast-flowing water or spotted at night with a torch. Look for it in well-oxygenated headwaters and chalk streams where water quality remains high.
Ethical Viewing Guidelines
- If searching under stones, replace them gently in their original position afterwards to avoid damaging the habitat and any eggs guarded by a male beneath them.
- This species is sensitive to water quality and habitat disturbance rather than to close approach itself, so the main precaution is minimising disruption to streambeds.
- Freshwater habitat protections vary by country, so follow local guidance on wading and disturbing riverbeds, particularly in protected chalk stream catchments.
LCNaNScorpaeniformesCottidae
Seasonal Activity
604,947 sightings · 2000–2026
Citizen science records via GBIF
All monthsThis month
Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- NaN
- Order
- Scorpaeniformes
- Family
- Cottidae
Photo
(c) Julien Renoult, some rights reserved (CC BY), uploaded by Julien Renoult
CC-BY-4.0
Occurrence data from GBIF.