RiverFish

Bullhead · Cottus gobio

Bullhead in the Main River Chew

Largest measured bullhead: 9.9 cm

The largest bullhead measured in Environment Agency surveys of the Main River Chew was 9.9 cm, recorded at Chew Magna on 5 July 2011.

Across 459 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 Main River Chew.

See bullhead records across England →

Most recent observation18 June 2025Shrowl Bridge (Te)
Largest measured bullhead
9.9 cm
Median length
6.3 cm
Fish measured
459
Survey locations
10

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
9.9 cm5 Jul 2011Chew Magna127361
9.8 cm23 Jul 2014Stanton Drew (Te)141877
9.3 cm5 Jul 2011Chew Magna127361
9.1 cm23 Jul 2014Stanton Drew (Te)141877
9 cm5 Jul 2011Chew Magna127361
8.9 cm15 Jul 2010Stanton Drew (Te)122841
8.8 cm8 Oct 2013Coley139242
8.7 cm4 Sept 2012Pensford (Te)133261
8.7 cm5 Jul 2011Chew Magna127361
8.7 cm25 May 2011Shrowl Bridge (Te)126387

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
Shrowl Bridge (Te)12 Jul 200218 Jun 20256
Chewton Keynsham4 Sept 200718 Jul 20233
Stanton Drew (Te)31 Aug 200511 Jul 20239
Pensford (Te)15 May 20026 Jul 20239
Compton Dando (Te)20 Jun 200327 Jun 20238
Keynsham Park (Te)3 Sept 200318 Jul 20196
Coley8 Oct 20138 Oct 20131
Chew Magna5 Jul 20115 Jul 20111
Downstream Chew Valley Lake (Te)8 Jul 200313 Jul 20042
Byemills5 Sept 20025 Sept 20021

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

2002–2025

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 459 measured fish were spread across different length ranges.

Smallest
2.6 cm
Lower quarter
5.3 cm
Median
6.3 cm
Upper quarter
7.2 cm
Largest
9.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Main River Chew

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

Roach Minnow Stone loach Brown / sea trout European eel Gudgeon

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 →