Bullhead · Cottus gobio

Bullhead in the River Granta

Largest measured bullhead: 10 cm

The largest bullhead measured in Environment Agency surveys of the River Granta was 10 cm, recorded at Babraham (I.A.P) on 10 April 2013.

Across 222 measured bullhead, the median measured length was 5.4 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 Granta.

See bullhead records across England →

Most recent observation10 June 2025Great Shelford

Largest measured bullhead: 10 cm
Median length: 5.4 cm
Fish measured: 222
Survey locations: 9

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 cm	10 Apr 2013	Babraham (I.A.P)	135828
9.4 cm	10 Apr 2013	Babraham	135830
9.3 cm	20 May 2025	Babraham (I.A.P)	177117
9.2 cm	8 Apr 2013	Great Shelford	135807
9.1 cm	10 Apr 2013	Babraham	135830
9 cm	8 Apr 2013	Great Shelford	135807
9 cm	14 May 2003	DS Hildersham	75969
9 cm	14 May 2003	DS Hildersham	75969
8.8 cm	8 Apr 2013	Great Shelford	135807
8.8 cm	29 Oct 1993	Babraham (I.A.P)	29407

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
Great Shelford	8 Apr 2013	10 Jun 2025	4
Babraham (I.A.P)	29 Oct 1993	20 May 2025	9
Babraham	29 Oct 1993	16 May 2022	8
Barham Hall Linton	12 Apr 1991	11 Apr 2019	3
Hildersham	27 Oct 1993	26 Apr 2016	5
Linton Gauging Station	23 May 2013	23 May 2013	1
Church End Ashdon	10 Feb 2005	10 Feb 2005	1
Ashdon	10 Feb 2005	10 Feb 2005	1
DS Hildersham	16 May 2001	14 May 2003	2

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

1991–2025

Survey records by year

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

191

092

393

094

095

096

397

098

099

000

101

002

103

004

505

006

007

208

009

010

011

012

513

014

015

516

017

018

419

020

021

222

023

024

225

Fish measured by surveyors

Measured length distribution

See how the 222 measured fish were spread across different length ranges.

Smallest: 2.9 cm
Lower quarter: 4.6 cm
Median: 5.4 cm
Upper quarter: 6.8 cm
Largest: 10 cm

0–99 mm

221

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Granta

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

3-spined stickleback Brown / sea trout Minnow Stone loach Roach Gudgeon

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 →