Bullhead · Cottus gobio

Bullhead in the Roxwell Brook

Largest measured bullhead: 9.2 cm

The largest bullhead measured in Environment Agency surveys of the Roxwell Brook was 9.2 cm, recorded at Roxwell Village on 20 January 2005.

Across 96 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 Roxwell Brook.

See bullhead records across England →

Most recent observation3 December 2020u/s Skreens Park Rd Bridge · 13 fish

Largest measured bullhead: 9.2 cm
Median length: 5.6 cm
Fish measured: 96
Survey locations: 4

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
9.2 cm	20 Jan 2005	Roxwell Village	84203
8.8 cm	18 Feb 1998	Roxwell Village	13431
8.2 cm	20 Jan 2005	Roxwell Village	84203
8.1 cm	18 Feb 1998	Writtle Agricultural College	13430
8 cm	18 Feb 1998	Writtle Agricultural College	13430
7.9 cm	30 Mar 2012	Writtle Agricultural College	131126
7.8 cm	18 Feb 1998	Roxwell Village	13431
7.7 cm	18 Feb 1998	Writtle Agricultural College	13430
7.5 cm	18 Feb 1998	Writtle Agricultural College	13430
7.4 cm	18 Feb 1998	Writtle Agricultural College	13430

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
u/s Skreens Park Rd Bridge	31 Aug 2018	3 Dec 2020	3
Writtle Agricultural College	18 Feb 1998	30 Mar 2012	3
Roxwell Village	18 Feb 1998	20 Jan 2005	2
Patience Bridge	20 Jan 2005	20 Jan 2005	1

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

1998–2020

Survey records by year

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

298

099

000

001

002

003

004

305

006

007

008

009

010

011

112

013

014

015

016

017

118

119

120

Fish measured by surveyors

Measured length distribution

See how the 96 measured fish were spread across different length ranges.

Smallest: 3.2 cm
Lower quarter: 4.6 cm
Median: 5.6 cm
Upper quarter: 6.4 cm
Largest: 9.2 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Roxwell Brook

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

3-spined stickleback Stone loach Minnow Dace Roach Chub

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 →