Bullhead · Cottus gobio

Bullhead in the River Hiz

Largest measured bullhead: 10.9 cm

The largest bullhead measured in Environment Agency surveys of the River Hiz was 10.9 cm, recorded at Ickleford Common on 18 September 2019.

Across 133 measured bullhead, the median measured length was 7.9 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 Hiz.

See bullhead records across England →

Most recent observation3 July 2024Amenity Trees Arlesey · 1 fish

Largest measured bullhead: 10.9 cm
Median length: 7.9 cm
Fish measured: 133
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
10.9 cm	18 Sept 2019	Ickleford Common	155518
10.9 cm	25 May 2016	Amenity Trees Arlesey	148077
10.7 cm	18 Sept 2019	Ickleford Common	155518
10.5 cm	18 Sept 2019	Ickleford Common	155518
10.5 cm	18 Sept 2019	Ickleford Common	155518
10.5 cm	18 Sept 2019	Ickleford Common	155518
10.5 cm	24 May 2012	Ickleford Common	131265
10.3 cm	6 Mar 2013	Amenity Trees Arlesey	135622
10.3 cm	25 May 1998	Arlesey Garden	29285
10.3 cm	29 Apr 1998	Church End	29284

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
Amenity Trees Arlesey	6 Mar 2013	3 Jul 2024	3
Ickleford Common	24 May 2012	2 Jul 2024	4
Hitchin Allotments	2 Dec 2009	2 Dec 2009	1
Arlesey Garden	19 Dec 1991	25 May 1998	2
Church End	29 Apr 1998	29 Apr 1998	1

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

1991–2024

Survey records by year

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

191

092

093

094

095

096

097

298

099

000

001

002

003

004

005

006

007

008

109

010

011

112

113

014

015

216

017

018

119

020

021

022

023

224

Fish measured by surveyors

Measured length distribution

See how the 133 measured fish were spread across different length ranges.

Smallest: 3.8 cm
Lower quarter: 7.1 cm
Median: 7.9 cm
Upper quarter: 8.8 cm
Largest: 10.9 cm

0–99 mm

122

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Hiz

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

3-spined stickleback Pike Stone loach Minnow Gudgeon 10-spined stickleback

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 →