Bullhead · Cottus gobio

Bullhead in the River Len

Largest measured bullhead: 9 cm

The largest bullhead measured in Environment Agency surveys of the River Len was 9 cm, recorded at Fulling Mill on 16 August 2004.

Across 44 measured bullhead, the median measured length was 5.2 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 Len.

See bullhead records across England →

Most recent observation24 July 2023Turkey Mill · 1 fish

Largest measured bullhead: 9 cm
Median length: 5.2 cm
Fish measured: 44
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 cm	16 Aug 2004	Fulling Mill	82993
8.7 cm	2 Oct 2009	Caring Lane	120352
8.5 cm	16 Aug 2004	Fulling Mill	82993
8.3 cm	2 Oct 2009	Caring Lane	120352
8.2 cm	2 Oct 2009	Caring Lane	120352
7.2 cm	16 Aug 2004	Fulling Mill	82993
6.9 cm	24 Jul 2023	Turkey Mill	163087
6.8 cm	2 Oct 2009	Caring Lane	120352
6.7 cm	16 Aug 2004	Fulling Mill	82993
6.5 cm	2 Oct 2009	Caring Lane	120352

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
Turkey Mill	24 Jul 2023	24 Jul 2023	1
Thurnham Mill	1 Sept 2017	1 Sept 2017	1
Fulling Mill	16 Aug 2004	27 Jul 2017	4
Caring Lane	2 Oct 2009	2 Oct 2009	1

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

2004–2023

Survey records by year

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

104

005

006

007

008

109

110

111

012

013

014

015

016

217

018

019

020

021

022

123

Fish measured by surveyors

Measured length distribution

See how the 44 measured fish were spread across different length ranges.

Smallest: 3.3 cm
Lower quarter: 4.3 cm
Median: 5.3 cm
Upper quarter: 6.4 cm
Largest: 9 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Len

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

European eel Gudgeon Perch Pike Roach Common bream

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 →