Bullhead · Cottus gobio

Bullhead in the River Brett (Main Reaches)

Largest measured bullhead: 9.6 cm

The largest bullhead measured in Environment Agency surveys of the River Brett (Main Reaches) was 9.6 cm, recorded at Cobbolds Mill on 16 April 2018.

Across 545 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 Brett (Main Reaches).

See bullhead records across England →

Most recent observation9 April 2026Waterhouse Farm · 48 fish

Largest measured bullhead: 9.6 cm
Median length: 6.2 cm
Fish measured: 545
Survey locations: 13

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
9.6 cm	16 Apr 2018	Cobbolds Mill	152538
9.4 cm	16 Apr 2018	Cobbolds Mill	152538
9.4 cm	16 Apr 2018	Cobbolds Mill	152538
9.3 cm	16 Apr 2018	Cobbolds Mill	152538
9.3 cm	25 Sept 2013	Peyton Hall	140035
9.2 cm	16 Apr 2018	Cobbolds Mill	152538
9 cm	25 Apr 2024	Waterhouse Farm	165727
9 cm	16 Apr 2018	Cobbolds Mill	152538
9 cm	11 Apr 2006	Semer A	90605
8.9 cm	24 Feb 1988	Cosford Bridge	13732

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
Waterhouse Farm	11 Jan 1985	9 Apr 2026	13
Higham FGS	4 Apr 2006	7 Apr 2026	8
Hadleigh Town	7 Apr 2006	26 Apr 2024	4
Chelsworth	13 Apr 2006	26 Apr 2018	3
Cobbolds Mill	7 Apr 2000	16 Apr 2018	4
Cosford Bridge	17 Feb 1982	13 Apr 2018	6
Hadleigh STW	10 Mar 1988	30 Sept 2013	3
Semer A	16 Feb 1982	25 Sept 2013	5
Peyton Hall	20 Dec 1984	25 Sept 2013	6
Cherry Hill	24 Mar 1994	20 Apr 2006	4
Downstream Mill Farm	5 Apr 2006	5 Apr 2006	1
Upstream Mill Farm	29 Mar 2006	29 Mar 2006	1
Semer B (Dairy Farm - River Brett)	17 Feb 1982	13 Dec 1984	2

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

1982–2026

Survey records by year

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

382

083

384

185

086

087

488

089

090

091

092

093

294

095

096

497

098

099

400

001

002

003

004

005

1206

007

008

009

210

011

612

313

114

015

216

017

618

019

020

021

222

023

324

025

226

Fish measured by surveyors

Measured length distribution

See how the 545 measured fish were spread across different length ranges.

Smallest: 3 cm
Lower quarter: 5.2 cm
Median: 6.2 cm
Upper quarter: 7.1 cm
Largest: 9.6 cm

0–99 mm

545

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Brett (Main Reaches)

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

European eel Pike Roach Gudgeon Dace Perch

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 →