RiverFish

Bullhead · Cottus gobio

Bullhead in the Belchamp Brook (Main Reaches)

Largest measured bullhead: 10.5 cm

The largest bullhead measured in Environment Agency surveys of the Belchamp Brook (Main Reaches) was 10.5 cm, recorded at Brundon (Belchamp Brook) on 20 February 1985.

Across 309 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 Belchamp Brook (Main Reaches).

See bullhead records across England →

Most recent observation29 May 2026Gas Pipe Mark · 51 fish
Largest measured bullhead
10.5 cm
Median length
6.3 cm
Fish measured
309
Survey locations
3

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
10.5 cm20 Feb 1985Brundon (Belchamp Brook)13806
10.2 cm12 Jun 2012Brundon (Belchamp Brook)132364
10.1 cm20 May 2024Gas Pipe Mark165737
10.1 cm12 Jun 2012Brundon (Belchamp Brook)132364
10.1 cm18 May 2000Bardfield Bridge15503
10.1 cm20 Feb 1985Brundon (Belchamp Brook)13806
10 cm12 Jun 2012Brundon (Belchamp Brook)132364
9.7 cm19 Feb 1985Bardfield Bridge13808
9.5 cm20 May 2024Gas Pipe Mark165737
9.5 cm18 May 2000Bardfield Bridge15503

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
Gas Pipe Mark20 Feb 198529 May 202613
Brundon (Belchamp Brook)20 Feb 198529 May 20245
Bardfield Bridge19 Feb 198513 Jun 20126

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 309 measured fish were spread across different length ranges.

Smallest
2.8 cm
Lower quarter
5.6 cm
Median
6.3 cm
Upper quarter
7.4 cm
Largest
10.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Belchamp Brook (Main Reaches)

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

Pike Chub Roach Dace 3-spined stickleback 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 →