Bullhead · Cottus gobio

Bullhead in the Itchen Navigation

Largest measured bullhead: 9 cm

The largest bullhead measured in Environment Agency surveys of the Itchen Navigation was 9 cm, recorded at Ham Farm on 27 October 2025.

Across 32 measured bullhead, the median measured length was 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 Itchen Navigation.

See bullhead records across England →

Most recent observation27 October 2025Ham Farm · 163 fish

Largest measured bullhead: 9 cm
Median length: 6 cm
Fish measured: 32
Survey locations: 2

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 cm	27 Oct 2025	Ham Farm	179579
8.5 cm	27 Oct 2025	Ham Farm	179579
8.2 cm	27 Oct 2025	Ham Farm	179579
8 cm	27 Oct 2025	Ham Farm	179579
7.8 cm	27 Oct 2025	Ham Farm	179579
7.7 cm	27 Oct 2025	Ham Farm	179579
7.2 cm	27 Oct 2025	Ham Farm	179579
7.1 cm	27 Oct 2025	Ham Farm	179579
7 cm	27 Oct 2025	Ham Farm	179579
7 cm	27 Oct 2025	Ham Farm	179579

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
Ham Farm	1 Sept 2009	27 Oct 2025	9
Allbrook Lock	18 Sept 2002	18 Sept 2002	1

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

2002–2025

Survey records by year

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

102

003

004

005

006

007

008

109

010

111

012

113

014

115

016

117

018

119

020

021

122

123

024

125

Fish measured by surveyors

Measured length distribution

See how the 32 measured fish were spread across different length ranges.

Smallest: 3.2 cm
Lower quarter: 4.9 cm
Median: 6 cm
Upper quarter: 7 cm
Largest: 9 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Itchen Navigation

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

European eel Pike Minnow Roach Grayling Atlantic salmon

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 →