RiverFish

Bullhead · Cottus gobio

Bullhead in the River Derwent

Largest measured bullhead: 12.2 cm

The largest bullhead measured in Environment Agency surveys of the River Derwent was 12.2 cm, recorded at River Derwent at Eddy's Bridge on 13 September 2009.

Across 199 measured bullhead, the median measured length was 6.3 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Derwent.

See bullhead records across England →

Most recent observation15 July 2025River Derwent at Rowlands Gill
Largest measured bullhead
12.2 cm
Median length
6.3 cm
Fish measured
199
Survey locations
15

Individual EA measurements

Largest measured bullhead

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
12.2 cm13 Sept 2009River Derwent at Eddy's Bridge119120
8.7 cm17 Jul 2008River Derwent at Allensford114874
8.6 cm9 Aug 2009River Derwent at Allensford120337
8.4 cm9 Aug 2009River Derwent at Allensford120337
8.2 cm20 Aug 2007River Derwent at Allensford107176
8.1 cm9 Aug 2009River Derwent at Allensford120337
8.1 cm9 Aug 2009River Derwent at Allensford120337
8.1 cm17 Jul 2008River Derwent at Allensford114874
8.1 cm20 Aug 2007River Derwent at Allensford107176
8 cm9 Aug 2009River Derwent at Allensford120337

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where bullhead were found

Each point marks a survey location with at least one bullhead record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyedFirst recordedLast recordedVisits finding bullhead
River Derwent at Rowlands Gill21 Aug 200715 Jul 20259
River Derwent at Ebchester27 Sept 200415 Jul 20255
River Derwent at Clockburn28 Aug 200715 Jul 20254
River Derwent at Blackhall Mill13 Sept 200415 Jul 202514
River Derwent at Shotley Bridge14 Aug 200714 Jul 20258
River Derwent at Cricket Club20 Aug 200714 Jul 20254
River Derwent at Allensford27 Sept 200414 Jul 202514
River Derwent at Ruffside Picnic Site11 Jul 202511 Jul 20251
River Derwent at Eddy's Bridge28 Aug 200711 Jul 20258
River Derwent at Crooked Oak21 Sept 200611 Jul 20256
Hisehope Burn26 Jun 200711 Jul 20254
River Derwent at Hag Hill27 Aug 200718 Aug 20175
River Derwent at Lintzford2 Aug 201317 Aug 20175
River Derwent at Ebchester Bridge2 Sept 20092 Sept 20091
River Derwent at Rowlands Gill Caravan Park14 Oct 200514 Oct 20051

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

2004–2025

Survey records by year

Each bar shows how many survey visits recorded bullhead that year.

Fish measured by surveyors

Measured length distribution

See how the 199 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
4.7 cm
Median
6.3 cm
Upper quarter
7.1 cm
Largest
12.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent

Compare other species with enough survey and measurement data for a detailed page.

Brown / sea trout Minnow Stone loach European eel Atlantic salmon Grayling

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →