RiverFish

Bullhead · Cottus gobio

Bullhead in the River Derwent (Yorkshire)

Largest measured bullhead: 9.2 cm

The largest bullhead measured in Environment Agency surveys of the River Derwent (Yorkshire) was 9.2 cm, recorded at Downstream Weir Head DERBT3 on 1 September 2016.

Across 476 measured bullhead, the median measured length was 5 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 (Yorkshire).

See bullhead records across England →

Most recent observation11 August 2025Yedingham - Fry Survey · 1 fish
Largest measured bullhead
9.2 cm
Median length
5 cm
Fish measured
476
Survey locations
21

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
9.2 cm1 Sept 2016Downstream Weir Head DERBT3149127
9.2 cm1 Sept 2016Downstream Weir Head DERBT3149127
9 cm23 Aug 2013Downstream Forge Valley gauging weir. DERBT5.138500
8.6 cm1 Sept 2016Downstream Forge Valley gauging weir. DERBT5.149130
8.5 cm23 Aug 2013Downstream Forge Valley gauging weir. DERBT5.138500
8.5 cm13 Sept 2012Downstream Forge Valley gauging weir. DERBT5.133488
8.5 cm13 Sept 2012Langdale end bridge133482
8.3 cm23 Aug 2013Downstream Forge Valley gauging weir. DERBT5.138500
8.2 cm1 Sept 2016Downstream Weir Head DERBT3149127
8.2 cm23 Aug 2013Downstream Weir Head DERBT3138494

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
Yedingham - Fry Survey18 Sept 198411 Aug 202525
Downstream Weir Head DERBT324 Sept 20013 Sept 202416
Downstream Forge Valley gauging weir. DERBT5.24 Sept 20013 Sept 202415
Yedingham DERCORS413 Jul 200931 Jul 20246
Sutton Upon Derwent DERCORS1826 Sept 199730 Jul 202413
Downstream West Ayton DERBT630 Aug 200014 Aug 20195
Stamford Bridge DERCORS1024 Apr 199516 Jul 201815
Malton DERCORS55 Sept 200116 Jul 201812
Kirkham Abbey DERCORS77 Sept 200116 Jul 201812
Buttercrambe DERCORS914 Sept 200128 Jun 201812
Bubwith - Fry Survey17 Sept 200114 Aug 20177
Howsham DERCORS812 Sept 200116 Jul 20159
Darrells Low Fm17 Sept 201217 Sept 20121
Langdale end bridge20 Jun 200613 Sept 20122
Downstream Wrench Green Bridge.DERBT225 Jun 200213 Sept 20122
Wheldrake Ings DERCORS1917 Sept 200112 Sept 20077
Upstream Wrench Green Bridge25 Jun 200221 Jun 20062
Low Hutton DERCORS67 Sept 200121 Sept 20054
Breighton DERCORS2025 Apr 199510 Sept 20036
Barmby on the Marsh DERCORS218 Sept 200016 Sept 20023
Old Man's Mouth DERBT424 Jun 200224 Jun 20021

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

1984–2025

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 476 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
3.4 cm
Median
5 cm
Upper quarter
6 cm
Largest
9.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent (Yorkshire)

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

Minnow Stone loach Dace European eel 3-spined stickleback Roach

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 →