RiverFish

Bullhead · Cottus gobio

Bullhead in the River Ruthern

Largest measured bullhead: 9.2 cm

The largest bullhead measured in Environment Agency surveys of the River Ruthern was 9.2 cm, recorded at Ruthern Bridge on 2 July 2013.

Across 576 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 Ruthern.

See bullhead records across England →

Most recent observation1 July 2026Ruthern Bridge · 30 fish
Largest measured bullhead
9.2 cm
Median length
5.5 cm
Fish measured
576
Survey locations
8

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
9.2 cm2 Jul 2013Ruthern Bridge136957
8.8 cm2 Jul 2024Ruthern Bridge165490
8.5 cm12 Jul 2022Ruthern Bridge161640
8.4 cm2 Jul 2024Ruthernbridge Dip165493
8.3 cm2 Jul 2024Ruthernbridge Dip165493
8.2 cm6 Jul 2006Withiel100052
8.1 cm17 Jul 2019Ruthern Bridge155149
8.1 cm11 Jul 2017Ruthern Bridge151198
7.9 cm2 Jul 2024Ruthern Bridge165490
7.8 cm17 Jul 2019Ruthern Bridge155149

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
Ruthern Bridge20 Jun 19891 Jul 202626
Upstream Withiel7 Jun 202310 Jul 20242
Upstream Treliver18 Jul 202310 Jul 20242
Ruthernbridge Dip28 Jun 20232 Jul 20242
Trewithian16 Jul 19804 Jul 202310
Withiel16 Jul 19807 Jun 202311
Cottonwood23 Jul 198021 Jul 20008
Trewollack25 May 19857 Aug 19974

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

1980–2026

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 576 measured fish were spread across different length ranges.

Smallest
1.5 cm
Lower quarter
3.2 cm
Median
5.5 cm
Upper quarter
6.2 cm
Largest
9.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ruthern

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

Brown / sea trout European eel Atlantic salmon 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 →