RiverFish

Bullhead · Cottus gobio

Bullhead in the River Bollin

Largest measured bullhead: 12.1 cm

The largest bullhead measured in Environment Agency surveys of the River Bollin was 12.1 cm, recorded at Bo12 on 20 August 2003.

Across 156 measured bullhead, the median measured length was 6.8 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 Bollin.

See bullhead records across England →

Most recent observation9 September 2025Bobo07
Largest measured bullhead
12.1 cm
Median length
6.8 cm
Fish measured
156
Survey locations
27

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
12.1 cm20 Aug 2003Bo1276732
12 cm5 Aug 2004Bobo1080983
11.9 cm5 Aug 2004Bobo1080983
11.8 cm19 Aug 2003Bobo1076735
11.6 cm26 Jul 2002Mc0364561
11.4 cm19 Aug 2003Bobo1076735
11.2 cm20 Aug 2003Bo1276732
10.9 cm5 Aug 2004Bobo1080983
10.7 cm26 Sept 2002Bobo1064040
10.4 cm26 Sept 2002Bobo1064040

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
Bobo079 Sept 20259 Sept 20251
Bo1120 Sept 20228 Sept 20252
Bobo3117 Aug 201113 Aug 20255
Bobo208 Jul 200523 Jul 20254
Bobo1929 Aug 200723 Jul 20256
Bobo133 Aug 201022 Jul 20253
Bobo1022 Aug 200117 Jul 202513
Bo0818 Aug 199316 Jul 20254
Bo0718 Aug 199321 Sept 20223
Bo0417 Aug 199321 Sept 20223
Mc0530 Jul 200220 Sept 20223
Bobo123 Aug 201014 Sept 20224
Bo0217 Aug 199325 Jul 201822
Bobo1414 Oct 201014 Oct 20101
Bo0317 Aug 199329 Apr 201023
Bobo2526 Jun 200826 Jun 20081
Bobo307 Aug 200623 Jun 20083
Bo0110 Sept 200125 Oct 20063
Mc0312 Jul 199927 Sept 20053
Bobo167 Sept 20044 Aug 20052
Bobo1520 Aug 20034 Aug 20052
Bo1220 Aug 200320 Aug 20031
Mc0126 Jul 200226 Jul 20021
Bo0615 Aug 199615 Aug 19961
Bo0918 Aug 19936 Aug 19962
Bo056 Aug 19966 Aug 19961
Bo202 Nov 19932 Nov 19931

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

1993–2025

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 156 measured fish were spread across different length ranges.

Smallest
3 cm
Lower quarter
5.8 cm
Median
6.9 cm
Upper quarter
8.5 cm
Largest
12.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Bollin

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

Stone loach 3-spined stickleback Gudgeon Brown / sea trout Chub Roach

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 →