RiverFish

Bullhead · Cottus gobio

Bullhead in the River Box (Main Reaches)

Largest measured bullhead: 10.2 cm

The largest bullhead measured in Environment Agency surveys of the River Box (Main Reaches) was 10.2 cm, recorded at Thorington Mill on 31 May 2018.

Across 587 measured bullhead, the median measured length was 6.2 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 Box (Main Reaches).

See bullhead records across England →

Most recent observation22 May 2026Stour Confluence · 45 fish
Largest measured bullhead
10.2 cm
Median length
6.2 cm
Fish measured
587
Survey locations
2

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
10.2 cm31 May 2018Thorington Mill152769
9.9 cm6 Jun 2012Stour Confluence132348
9.8 cm22 May 2026Stour Confluence181412
9.7 cm8 May 2024Thorington Mill165730
9.7 cm8 May 2024Thorington Mill165730
9.4 cm31 May 2018Thorington Mill152769
9.3 cm13 May 2024Stour Confluence165729
9.3 cm1 Jun 2010Stour Confluence121741
9.2 cm13 May 2024Stour Confluence165729
9.2 cm12 Jul 2021Stour Confluence160614

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
Stour Confluence22 Mar 198522 May 202613
Thorington Mill16 May 20068 May 20245

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

1985–2026

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 587 measured fish were spread across different length ranges.

Smallest
4.1 cm
Lower quarter
5.6 cm
Median
6.2 cm
Upper quarter
7.2 cm
Largest
10.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Box (Main Reaches)

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

European eel Brown / sea trout Stone loach Dace Roach Chub

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 →