Bullhead · Cottus gobio

Bullhead in the River Main Culm

Largest measured bullhead: 8.4 cm

The largest bullhead measured in Environment Agency surveys of the River Main Culm was 8.4 cm, recorded at Glasshouses on 29 April 2019.

Across 322 measured bullhead, the median measured length was 5 cm.

Surveyors recorded weights for 4 bullhead. The median was 0.1 oz (0.0025 kg) and the largest recorded weight was 0.1 oz (0.003 kg).

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 Culm.

See bullhead records across England →

Most recent observation22 May 2026Glasshouses · 130 fish
Largest measured bullhead
8.4 cm
Median length
5 cm
Fish measured
322
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
8.4 cm29 Apr 2019Glasshouses154868
8.2 cm29 Apr 2019Glasshouses154868
7.2 cm29 Apr 2019Glasshouses154868
7 cm29 Apr 2019Glasshouses154868
6.9 cm18 Jun 2019Uffculme (Sp)154621
6.9 cm29 Apr 2019Glasshouses154868
6.8 cm29 Apr 2019Glasshouses154868
6.8 cm12 Oct 2007Coldharbour Leat (CFTe)*108643
6.7 cm8 Aug 2019200m Downstream Culmstock Bridge (Sp /Dip)155375
6.7 cm29 Apr 2019Glasshouses154868

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
Glasshouses29 Apr 201922 May 20262
Palmers Farm (Sp/WFD)30 May 199729 May 20256
Columbjohn (CFTe/wfdi)*10 Sept 200916 Sept 20223
Whitehall Bridge (Sp)4 Jul 20138 Aug 20192
200m Downstream Culmstock Bridge (Sp /Dip)25 Jun 20138 Aug 20192
Uffculme (Sp)9 Jun 199718 Jun 20195
Lears Farm (Sp)30 May 199729 May 20195
Venn Farm (Sp)*9 Jun 19971 Jul 20134
Coldharbour Leat (CFTe)*8 Oct 20038 Sept 20096
Langlands D/s ford (Dip)*11 Oct 20031 Oct 20085
Downstream Culmstock Br. (Dip)*16 Sept 200816 Sept 20081
Hemyock (Sp)*6 Jun 199722 May 20082
Langlands Horseshoe (Dip)*8 Oct 20032 Nov 20064
Footbridge in Uffculm (Dip)*9 Sept 20059 Sept 20051
Lower Kingsmill (CFTe)*10 Jun 199724 Sept 20033
Skinners Farm (Sp)*9 Jun 199721 Jun 20002
Bagbear Farm (Sp)*30 May 199719 Jun 20002
Southey Barton (Sp)*6 Jun 19976 Jun 19971
Culmstock (Sp)*6 Jun 19976 Jun 19971

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

1997–2026

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 322 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
4.4 cm
Median
5 cm
Upper quarter
5.6 cm
Largest
8.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 4 bullhead. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.002 kg)
Lower quarter
0.1 oz (0.002 kg)
Median
0.1 oz (0.0025 kg)
Upper quarter
0.1 oz (0.003 kg)
Heaviest
0.1 oz (0.003 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Main Culm

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

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 →