RiverFish

Bullhead · Cottus gobio

Bullhead in the River Thame

Largest measured bullhead: 8.2 cm

The largest bullhead measured in Environment Agency surveys of the River Thame was 8.2 cm, recorded at Kingsey Cuttle Brook on 7 September 2010.

Across 31 measured bullhead, the median measured length was 6.3 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 Thame.

See bullhead records across England →

Most recent observation18 September 2025D/s Bear Brook
Largest measured bullhead
8.2 cm
Median length
6.3 cm
Fish measured
31
Survey locations
17

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
8.2 cm7 Sept 2010Kingsey Cuttle Brook125269
7.8 cm7 Sept 2010Kingsey Cuttle Brook125269
7.7 cm7 Sept 2010Kingsey Cuttle Brook125269
7.7 cm7 Sept 2010Kingsey Cuttle Brook125269
7.5 cm7 Sept 2010Kingsey Cuttle Brook125269
7.3 cm7 Sept 2010Kingsey Cuttle Brook125269
7.3 cm7 Sept 2010Kingsey Cuttle Brook125269
7.2 cm7 Sept 2010Kingsey Cuttle Brook125269
7.1 cm7 Sept 2010Kingsey Cuttle Brook125269
7 cm7 Sept 2010Kingsey Cuttle Brook125269

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
D/s Bear Brook11 Sept 200318 Sept 20253
Dorchester Road Bridge14 Oct 200317 Sept 202510
Chiselhampton18 Sept 200317 Sept 202511
Waterstock Mill20 Sept 200416 Sept 202510
Cuddesdon19 Sept 200316 Sept 202511
Old Crendon Road Bridge17 Sept 20049 Sept 202510
Nether Winchendon - Lower Riffle5 Aug 200228 Aug 202511
Kingsey Cuttle Brook24 Aug 20055 Aug 20254
Upstream of Notley Abbey20 Aug 200216 Sept 202211
Ickford Bridge20 Sept 200413 Sept 202210
Shabbington (West Arm)20 Aug 200221 Aug 201910
Downstream Eythrope16 Aug 201620 Aug 20192
Eythrope_ByPass Channel Site Two29 Jul 20134 Aug 20142
Eythrope_Historic Channel Site Three29 Jul 201329 Jul 20131
Eythrope_ByPass Channel Site One8 Jul 201029 Jul 20132
Eythrope9 Sept 20038 Sept 20094
Nether Winchendon - Original Enhancement5 Aug 200210 Sept 20032

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

2002–2025

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 31 measured fish were spread across different length ranges.

Smallest
3 cm
Lower quarter
5.6 cm
Median
6.3 cm
Upper quarter
7.2 cm
Largest
8.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thame

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

Chub Roach Gudgeon Dace Perch Pike

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 →