Bullhead · Cottus gobio

Bullhead in the River Ems

Largest measured bullhead: 7.5 cm

The largest bullhead measured in Environment Agency surveys of the River Ems was 7.5 cm, recorded at Lumley Mill sq on 29 October 2001.

Across 140 measured bullhead, the median measured length was 4.3 cm.

Surveyors recorded weights for 16 bullhead. The median was 0 oz (0.001 kg) and the largest recorded weight was 0.2 oz (0.005 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Ems.

See bullhead records across England →

Most recent observation10 June 2025Brook Meadow Footbridge · 14 fish

Largest measured bullhead: 7.5 cm
Median length: 4.3 cm
Fish measured: 140
Survey locations: 7

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
7.5 cm	29 Oct 2001	Lumley Mill sq	22683
7 cm	10 Jun 2025	Westbourne sq	176891
7 cm	29 Oct 2001	Lumley Mill sq	22683
6.9 cm	19 Oct 2010	Downstream Hampshire Bridge	125267
6.7 cm	10 Jun 2025	Westbourne sq	176891
6.5 cm	29 Oct 2001	Lumley Mill sq	22683
6.2 cm	19 Oct 2010	Downstream Hampshire Bridge	125267
6 cm	19 Oct 2010	Downstream Hampshire Bridge	125267
6 cm	19 Oct 2010	Downstream Hampshire Bridge	125267
6 cm	29 Oct 2001	Lumley Mill sq	22683

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
Westbourne sq	25 Oct 2001	10 Jun 2025	5
Brook Meadow Footbridge	20 May 2015	10 Jun 2025	2
Mill Meadows Farm	12 Aug 2021	12 Aug 2021	1
Deep Springs	12 Aug 2021	12 Aug 2021	1
Brook Meadow	8 May 2013	8 May 2013	1
Downstream Hampshire Bridge	19 Oct 2010	19 Oct 2010	1
Lumley Mill sq	29 Oct 2001	29 Oct 2001	1

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

2001–2025

Survey records by year

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

201

002

003

004

005

006

107

008

009

110

011

012

213

014

215

016

017

018

019

020

221

022

023

024

225

Fish measured by surveyors

Measured length distribution

See how the 140 measured fish were spread across different length ranges.

Smallest: 2.7 cm
Lower quarter: 4 cm
Median: 4.4 cm
Upper quarter: 5 cm
Largest: 7.5 cm

0–99 mm

140

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 16 bullhead. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0 oz (0.001 kg)
Median: 0 oz (0.001 kg)
Upper quarter: 0.1 oz (0.004 kg)
Heaviest: 0.2 oz (0.005 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Ems

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

Brown / sea trout European eel Pike

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 →