Bullhead · Cottus gobio

Bullhead in the River Main Allen

Largest measured bullhead: 9.7 cm

The largest bullhead measured in Environment Agency surveys of the River Main Allen was 9.7 cm, recorded at Daubuz's Moor on 31 May 2011.

Across 161 measured bullhead, the median measured length was 5.6 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 Main Allen.

See bullhead records across England →

Most recent observation15 August 2023Scawswater Mill · 16 fish

Largest measured bullhead: 9.7 cm
Median length: 5.6 cm
Fish measured: 161
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
9.7 cm	31 May 2011	Daubuz's Moor	126542
7.9 cm	12 Oct 2021	Scawswater Mill	160688
7.5 cm	17 Aug 2022	Daubuz's Moor	161607
7.4 cm	17 Aug 2022	Scawswater Mill	161608
7.2 cm	17 Aug 2022	Scawswater Mill	161608
7.2 cm	20 May 2022	Lanner Mill	160981
7.1 cm	17 Aug 2022	Scawswater Mill	161608
7.1 cm	12 Oct 2021	Scawswater Mill	160688
7 cm	17 Aug 2022	Daubuz's Moor	161607
7 cm	17 Aug 2022	Daubuz's Moor	161607

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
Scawswater Mill	31 Jul 1986	15 Aug 2023	4
Daubuz's Moor	18 Jul 1986	17 Aug 2022	4
Lanner Mill	15 Jul 1986	20 May 2022	2
Ladys Wood	16 Jul 1986	16 Jul 1986	1
Trenerry Wood	15 Jul 1986	15 Jul 1986	1

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

1986–2023

Survey records by year

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

586

087

088

089

090

091

092

093

094

095

096

097

098

099

000

001

002

003

004

105

006

007

008

009

010

111

012

013

014

015

016

017

018

019

020

121

322

123

Fish measured by surveyors

Measured length distribution

See how the 161 measured fish were spread across different length ranges.

Smallest: 2.5 cm
Lower quarter: 4.4 cm
Median: 5.6 cm
Upper quarter: 6.2 cm
Largest: 9.7 cm

0–99 mm

161

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Allen

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

Brown / sea trout European eel 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 →