Bullhead · Cottus gobio

Bullhead in the River Gannel

Largest measured bullhead: 8.4 cm

The largest bullhead measured in Environment Agency surveys of the River Gannel was 8.4 cm, recorded at Cosworth Ford on 30 August 2000.

Across 568 measured bullhead, the median measured length was 4.1 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 Gannel.

See bullhead records across England →

Most recent observation18 May 2021Benny Mill · 44 fish

Largest measured bullhead: 8.4 cm
Median length: 4.1 cm
Fish measured: 568
Survey locations: 8

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
8.4 cm	30 Aug 2000	Cosworth Ford	135677
8.3 cm	31 Aug 2000	Gwills	135681
8 cm	21 Aug 2000	Benny Mill	135672
8 cm	21 Aug 2000	Benny Mill	135672
7.9 cm	3 Oct 2018	Cosworth Ford	153959
7.8 cm	31 Aug 2000	Gwills	135681
7.7 cm	21 Aug 2000	Benny Mill	135672
7.6 cm	31 Aug 2000	Gwills	135681
7.5 cm	3 Oct 2018	Gwills	153775
7.5 cm	31 Aug 2000	Gwills	135681

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
Benny Mill	21 Aug 2000	18 May 2021	2
Gwills	9 May 1986	3 Oct 2018	5
Cosworth Ford	8 May 1986	3 Oct 2018	3
Kestle Mill	8 May 1986	31 Aug 2000	2
d/s Rose Cliston	7 May 1986	30 Aug 2000	2
Trewerry Mill	9 May 1986	30 Aug 2000	2
Trerice Mill	29 May 1986	29 May 1986	1
Perrose Udda	7 May 1986	7 May 1986	1

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

1986–2021

Survey records by year

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

786

087

088

089

090

091

092

093

094

095

096

097

098

099

600

001

002

003

004

105

006

007

008

009

010

111

012

013

014

015

016

017

218

019

020

121

Fish measured by surveyors

Measured length distribution

See how the 568 measured fish were spread across different length ranges.

Smallest: 2 cm
Lower quarter: 3.2 cm
Median: 4.1 cm
Upper quarter: 5.8 cm
Largest: 8.4 cm

0–99 mm

568

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Gannel

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 →