Bullhead · Cottus gobio

Bullhead in the River Dikler

Largest measured bullhead: 10.6 cm

The largest bullhead measured in Environment Agency surveys of the River Dikler was 10.6 cm, recorded at River Dickler - Bourton on the Water on 24 September 2009.

Across 170 measured bullhead, the median measured length was 6.2 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 Dikler.

See bullhead records across England →

Most recent observation24 October 2023River Dikler at Lower Swell

Largest measured bullhead: 10.6 cm
Median length: 6.2 cm
Fish measured: 170
Survey locations: 5

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
10.6 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
10.5 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
10.1 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
10 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
9.8 cm	26 Sept 2007	River Dikler at Upper Swell	106988
9.7 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
9.7 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
9.7 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
9.4 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
9.3 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895

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
River Dikler at Lower Swell	13 Mar 2002	24 Oct 2023	10
River Dickler - Bourton on the Water	24 Sept 2009	19 Jul 2023	2
Dikler Upstream confluence	13 Aug 2021	28 Jun 2023	2
Dickler at Stow Bridge	23 Jun 2021	26 Jun 2023	2
River Dikler at Upper Swell	10 Sept 2003	12 Sept 2014	8

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

2002–2023

Survey records by year

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

202

203

404

405

106

107

008

109

010

011

012

113

114

015

016

017

018

019

020

321

022

423

Fish measured by surveyors

Measured length distribution

See how the 170 measured fish were spread across different length ranges.

Smallest: 3 cm
Lower quarter: 4.7 cm
Median: 6.2 cm
Upper quarter: 7.2 cm
Largest: 10.6 cm

0–99 mm

166

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Dikler

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

Brown / sea trout European eel Minnow Brook lamprey

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 →