RiverFish

Bullhead · Cottus gobio

Bullhead in the Bolham River

Largest measured bullhead: 6.8 cm

The largest bullhead measured in Environment Agency surveys of the Bolham River was 6.8 cm, recorded at Hartsmoor Bridge (Sp) on 20 June 2019.

Across 29 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 Bolham River.

See bullhead records across England →

Most recent observation27 May 2026Hartsmoor Bridge (Sp) · 10 fish
Largest measured bullhead
6.8 cm
Median length
5 cm
Fish measured
29
Survey locations
1

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
6.8 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
6.7 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
6.7 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
6.2 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
5.8 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
5.7 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
5.6 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
5.5 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
5.4 cm20 Jun 2019Hartsmoor Bridge (Sp)154628
5.4 cm20 Jun 2019Hartsmoor Bridge (Sp)154628

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
Hartsmoor Bridge (Sp)21 May 199727 May 20267

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

1997–2026

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 29 measured fish were spread across different length ranges.

Smallest
2.2 cm
Lower quarter
4.7 cm
Median
5 cm
Upper quarter
5.5 cm
Largest
6.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Bolham River

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

Brown / sea trout

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 →