Bullhead · Cottus gobio

Bullhead in the Main River Isle

Largest measured bullhead: 10.4 cm

The largest bullhead measured in Environment Agency surveys of the Main River Isle was 10.4 cm, recorded at U/s Chard STW on 10 April 2013.

Across 478 measured bullhead, the median measured length was 5.6 cm.

Surveyors recorded weights for 115 bullhead. The median was 0.2 oz (0.007 kg) and the largest recorded weight was 0.5 oz (0.015 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Main River Isle.

See bullhead records across England →

Most recent observation30 June 2022Hort Bridge

Largest measured bullhead: 10.4 cm
Median length: 5.6 cm
Fish measured: 478
Survey locations: 11

Individual EA measurements

Largest measured bullhead

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

Length	Survey date	Survey location	Survey ID
10.4 cm	10 Apr 2013	U/s Chard STW	135873
10.1 cm	2 Jul 1992	Manor Farm, Knowle St. Giles (Se-06)	80025
10.1 cm	2 Jul 1992	Manor Farm, Knowle St. Giles (Se-06)	80025
10 cm	18 Jun 1992	Cocks Bridge (Te)	80033
9.9 cm	10 Apr 2013	U/s Chard STW	135873
9.9 cm	7 Jul 1992	Court Mill, Wadeford	80023
9.9 cm	2 Jul 1992	Manor Farm, Knowle St. Giles (Se-06)	80025
9.9 cm	2 Jul 1992	Manor Farm, Knowle St. Giles (Se-06)	80025
9.8 cm	10 Apr 2013	U/s Chard STW	135873
9.4 cm	2 Jul 1992	Manor Farm, Knowle St. Giles (Se-06)	80025

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 surveyed	First recorded	Last recorded	Visits finding bullhead
Hort Bridge	7 Jul 2010	30 Jun 2022	2
Cocks Bridge (Te)	18 Jun 1992	16 Jun 2022	13
Ashford Farm (Te)	26 Apr 2002	14 Jun 2022	9
Ilford Bridges (Te)	5 Aug 2002	23 Jun 2016	7
U/s Chard STW	10 Apr 2013	10 Apr 2013	1
Hambridge	24 May 2011	24 May 2011	1
Manor Farm, Knowle St. Giles (Se-06)	2 Jul 1992	2 Jun 2006	3
Bere Mills	17 Jul 1997	17 Jul 1997	1
Winterhay Lane	19 Jun 1992	4 Jul 1997	2
Court Mill, Wadeford	7 Jul 1992	7 Jul 1992	1
Earnshill House	19 May 1992	19 May 1992	1

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

1992–2022

Survey records by year

Each bar shows how many survey visits recorded bullhead that year.

592

093

094

095

096

497

098

099

000

001

202

303

304

305

106

007

208

109

410

211

112

313

114

015

316

017

018

019

020

021

322

Fish measured by surveyors

Measured length distribution

See how the 478 measured fish were spread across different length ranges.

Smallest: 2 cm
Lower quarter: 3.8 cm
Median: 5.6 cm
Upper quarter: 6.9 cm
Largest: 10.4 cm

0–99 mm

474

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 115 bullhead. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0.1 oz (0.004 kg)
Median: 0.2 oz (0.007 kg)
Upper quarter: 0.4 oz (0.011 kg)
Heaviest: 0.5 oz (0.015 kg)

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

More fish in this river

Explore the Main River Isle

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

European eel Stone loach Minnow Chub Dace 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 →