RiverFish

Bullhead · Cottus gobio

Bullhead in the River Main Walkham

Largest measured bullhead: 8.4 cm

The largest bullhead measured in Environment Agency surveys of the River Main Walkham was 8.4 cm, recorded at Downstream Foxhams on 23 August 2024.

Across 602 measured bullhead, the median measured length was 5.5 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 Main Walkham.

See bullhead records across England →

Most recent observation18 August 2025Foxhams · 33 fish
Largest measured bullhead
8.4 cm
Median length
5.5 cm
Fish measured
602
Survey locations
9

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
8.4 cm23 Aug 2024Downstream Foxhams167137
8.3 cm10 Aug 2023Lower Grenofen163840
8.2 cm5 Aug 2025Grenofen179029
8.2 cm23 Jul 2019Grenofen155365
8 cm15 Sept 2014Downstream Dittisham Natural Barrier143239
8 cm10 Jul 2013Grenofen137093
7.8 cm13 Aug 2024Lower Grenofen167192
7.8 cm22 Aug 2019Foxhams155706
7.8 cm23 Jul 2019Grenofen155365
7.8 cm15 Sept 2014Downstream Dittisham Natural Barrier143239

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
Foxhams5 Jul 198318 Aug 20256
Grenofen29 Jun 19835 Aug 202510
Huckworthy7 Jul 198323 Aug 20244
Downstream Foxhams10 Aug 202323 Aug 20242
Lower Grenofen10 Aug 202313 Aug 20242
Lower Bucktor12 Sept 202313 Aug 20242
d/s Bedford Bridge31 Jul 199823 Jul 20244
Downstream Dittisham Natural Barrier15 Sept 201415 Sept 20141
Bucktor1 Jul 19831 Aug 20023

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

1983–2025

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 602 measured fish were spread across different length ranges.

Smallest
1.6 cm
Lower quarter
3.2 cm
Median
5.5 cm
Upper quarter
6.2 cm
Largest
8.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Walkham

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

Brown / sea trout Atlantic salmon European eel

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 →