RiverFish

Bullhead · Cottus gobio

Bullhead in the River Main Warleggan

Largest measured bullhead: 9 cm

The largest bullhead measured in Environment Agency surveys of the River Main Warleggan was 9 cm, recorded at West Wood on 13 July 2018.

Across 727 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 Warleggan.

See bullhead records across England →

Most recent observation2 September 2025Carne Wood · 99 fish
Largest measured bullhead
9 cm
Median length
5.5 cm
Fish measured
727
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
9 cm13 Jul 2018West Wood153136
9 cm6 Oct 2017Carne Wood151888
8.7 cm30 Aug 2024Carne Wood167217
8.4 cm30 Aug 2024Carne Wood167217
8.3 cm2 Sept 2025Carne Wood179365
8.3 cm22 Aug 2023Carne Wood163154
8.2 cm22 Aug 2023Carne Wood163154
8.1 cm2 Sept 2025Carne Wood179365
8 cm30 Aug 2024Carne Wood167217
8 cm13 Jul 2018West Wood153136

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
Carne Wood6 Oct 20172 Sept 20256
West Wood10 Aug 197723 Jul 202420
Panters Bridge25 Aug 199825 Aug 19981

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 727 measured fish were spread across different length ranges.

Smallest
1.9 cm
Lower quarter
3.6 cm
Median
5.5 cm
Upper quarter
6.3 cm
Largest
9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Warleggan

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 →