RiverFish

Bullhead · Cottus gobio

Bullhead in the River Main Cardinham

Largest measured bullhead: 9.1 cm

The largest bullhead measured in Environment Agency surveys of the River Main Cardinham was 9.1 cm, recorded at Millpool Bridge on 12 June 2024.

Across 921 measured bullhead, the median measured length was 5.3 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Main Cardinham.

See bullhead records across England →

Most recent observation11 September 2025Margate Ford · 21 fish
Largest measured bullhead
9.1 cm
Median length
5.3 cm
Fish measured
921
Survey locations
6

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
9.1 cm12 Jun 2024Millpool Bridge165213
8.8 cm26 Sept 1979Margate Ford135511
8.6 cm28 Jun 2011Margate Ford126713
8.5 cm8 Aug 2024Margate Ford166966
8.4 cm8 Sept 2014Woodford142608
8.4 cm30 Apr 1979Margate Ford135475
8.3 cm3 Sept 2015Margate Ford146271
8.3 cm28 Jun 2011Margate Ford126713
8.2 cm16 Jul 2012Millpool Bridge132610
8.2 cm31 Jul 2000Cardinham104186

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
Margate Ford12 Aug 197711 Sept 202533
Woodford22 Sept 198321 Aug 202416
Fletchers Bridge28 Jul 199423 Jul 202412
Millpool Bridge27 Sept 198312 Jun 202413
Cardinham14 Sept 19799 Sept 200410
Peach Bridge23 Sept 19838 Sept 20048

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

1977–2025

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 921 measured fish were spread across different length ranges.

Smallest
1.5 cm
Lower quarter
4.4 cm
Median
5.3 cm
Upper quarter
6.2 cm
Largest
9.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Cardinham

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

Brown / sea trout Atlantic salmon European eel Brook lamprey

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 →