Bullhead · Cottus gobio

Bullhead in the River Mersey

Largest measured bullhead: 10.9 cm

The largest bullhead measured in Environment Agency surveys of the River Mersey was 10.9 cm, recorded at Mrme15 on 17 October 2002.

Across 2 measured bullhead, the median measured length was 10.2 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 Mersey.

See bullhead records across England →

Most recent observation14 July 2006Mrme05 · 27 fish

Largest measured bullhead: 10.9 cm
Median length: 10.2 cm
Fish measured: 2
Survey locations: 3

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	17 Oct 2002	Mrme15	65201
9.4 cm	17 Oct 2002	Mrme15	65201

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
Mrme11	27 Jun 2005	14 Jul 2006	2
Mrme05	27 Jun 2005	14 Jul 2006	2
Mrme15	17 Oct 2002	17 Oct 2002	1

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

2002–2006

Survey records by year

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

102

003

004

205

206

Fish measured by surveyors

Measured length distribution

See how the 2 measured fish were spread across different length ranges.

Smallest: 9.4 cm
Lower quarter: 9.8 cm
Median: 10.2 cm
Upper quarter: 10.5 cm
Largest: 10.9 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Mersey

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

Gudgeon Roach 3-spined stickleback Chub Minnow Perch

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 →