RiverFish

Bullhead · Cottus gobio

Bullhead in the River Gwash

Largest measured bullhead: 11 cm

The largest bullhead measured in Environment Agency surveys of the River Gwash was 11 cm, recorded at Church bridge - u/s Empingham on 16 March 1990.

Across 187 measured bullhead, the median measured length was 6.5 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 Gwash.

See bullhead records across England →

Most recent observation17 August 2023Foundry Road
Largest measured bullhead
11 cm
Median length
6.5 cm
Fish measured
187
Survey locations
16

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
11 cm16 Mar 1990Church bridge - u/s Empingham54497
10.5 cm16 Mar 1990Church bridge - u/s Empingham54497
10.5 cm15 Mar 1990Little Casterton54504
10.5 cm13 Mar 1990Foundry Road54506
10 cm9 Mar 1993Friths Farm54517
10 cm15 Mar 1990Downstream North Brook54500
10 cm14 Mar 1990Downstream Ingthorpe Road Bridge54502
10 cm14 Mar 1990Downstream Ingthorpe Road Bridge54502
10 cm13 Mar 1990Foundry Road54506
10 cm13 Mar 1990Friths Farm54505

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
Foundry Road13 Mar 199017 Aug 202313
Upstream White Post Bridge12 Mar 199015 Aug 202313
Church bridge - u/s Empingham16 Mar 19905 Jul 20239
Flow Project - Upstream Gt. Casterton STW15 May 201512 Sept 20184
Belmesthorpe Meadow12 Mar 19907 Sept 201810
Flow Project - DS Great Casterton STW15 May 20152 Nov 20152
Great Casterton14 Mar 199018 Jun 20155
Upstream Ryhall STW - Flow project Site14 May 201514 May 20151
Downstream Ryhall STW Flow project site14 May 201514 May 20151
Downstream Ingthorpe Road Bridge14 Mar 199023 May 20122
Shacklewell Lodge Ingthorpe17 May 201217 May 20121
Friths Farm13 Mar 19905 Jul 20116
Ingthorpe1 Aug 200627 Nov 20072
Tolethorpe2 Aug 20062 Aug 20061
Little Casterton15 Mar 19903 Apr 19963
Downstream North Brook15 Mar 19908 Mar 19932

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

1990–2023

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 187 measured fish were spread across different length ranges.

Smallest
2.9 cm
Lower quarter
5.5 cm
Median
6.5 cm
Upper quarter
8.5 cm
Largest
11 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Gwash

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

Brown / sea trout European eel Grayling Dace Roach Perch

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 →