RiverFish

Bullhead · Cottus gobio

Bullhead in the River Main Lynher

Largest measured bullhead: 9.2 cm

The largest bullhead measured in Environment Agency surveys of the River Main Lynher was 9.2 cm, recorded at Bathpool on 6 September 2012.

Across 2,367 measured bullhead, the median measured length was 4.9 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 Lynher.

See bullhead records across England →

Most recent observation26 August 2025Kerney Mill · 23 fish
Largest measured bullhead
9.2 cm
Median length
4.9 cm
Fish measured
2,367
Survey locations
19

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 cm6 Sept 2012Bathpool133244
8.3 cm16 Aug 2022Bathpool161883
8.2 cm31 Jul 2024Upstream Kerney Mill Dip166923
8.2 cm8 Aug 2018Berriowbridge153396
8.1 cm27 Aug 2024Bathpool167140
8 cm3 Sept 2024Berriowbridge167143
7.9 cm1 Jul 2024Knighton165440
7.9 cm17 Aug 2023Kerney Mill163134
7.8 cm23 Aug 2019Kerney Mill155704
7.7 cm31 Aug 2017Kerney Mill151668

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
Kerney Mill23 Aug 199026 Aug 202522
Knighton8 Jun 19821 Jul 202524
Trevague1 Jun 198217 Sept 20249
Rilla Mill23 Aug 199310 Sept 20247
Plusha Bridge28 Aug 19905 Sept 20248
Upstream Berriobridge19 Sept 20233 Sept 20242
Berriowbridge16 Jun 19823 Sept 20249
Trebartha2 Jun 198229 Aug 20249
Downstream Trebartha19 Sept 202329 Aug 20242
Bathpool15 Jun 198227 Aug 202422
Bicton Bridge25 Aug 199322 Aug 20247
Pillaton Mill4 Sept 199020 Aug 20248
Upstream Kerney Mill Dip17 Aug 202331 Jul 20242
Tregirls9 Jun 198228 Jun 20187
Newbridge30 Aug 199024 Aug 20065
Clapper Bridge5 Sept 199024 Aug 20065
Tregrenna3 Jun 198222 Jul 19973
Stara Bridge20 Aug 199317 Jun 19972
Trenilk4 Jun 19829 Jun 19973

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

1982–2025

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 2,367 measured fish were spread across different length ranges.

Smallest
1.2 cm
Lower quarter
3.1 cm
Median
4.9 cm
Upper quarter
5.7 cm
Largest
9.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Lynher

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

Brown / sea trout Atlantic salmon European eel Brook lamprey Minnow

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 →