RiverFish

Bullhead · Cottus gobio

Bullhead in the River Ashburn

Largest measured bullhead: 6.5 cm

The largest bullhead measured in Environment Agency surveys of the River Ashburn was 6.5 cm, recorded at Belford Mill (Sp) on 3 August 2021.

Across 19 measured bullhead, the median measured length was 5.2 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 Ashburn.

See bullhead records across England →

Most recent observation12 June 2024Belford Mill (Sp) · 2 fish
Largest measured bullhead
6.5 cm
Median length
5.2 cm
Fish measured
19
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
6.5 cm3 Aug 2021Belford Mill (Sp)160702
6.5 cm3 Aug 2021Belford Mill (Sp)160702
6.3 cm3 Aug 2021Belford Mill (Sp)160702
6.2 cm3 Aug 2021Belford Mill (Sp)160702
5.8 cm3 Aug 2021Belford Mill (Sp)160702
5.8 cm3 Aug 2021Belford Mill (Sp)160702
5.5 cm3 Aug 2021Belford Mill (Sp)160702
5.5 cm3 Aug 2021Belford Mill (Sp)160702
5.4 cm3 Aug 2021Belford Mill (Sp)160702
5.2 cm3 Aug 2021Belford Mill (Sp)160702

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
Belford Mill (Sp)5 Jun 199612 Jun 20247
Pridhamsleigh (Sp)*30 May 199618 Jun 20023

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

1996–2024

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 19 measured fish were spread across different length ranges.

Smallest
4.3 cm
Lower quarter
4.9 cm
Median
5.2 cm
Upper quarter
5.8 cm
Largest
6.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ashburn

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

Brown / sea trout 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 →