Bullhead · Cottus gobio

Bullhead in the River Aller

Largest measured bullhead: 9 cm

The largest bullhead measured in Environment Agency surveys of the River Aller was 9 cm, recorded at Holnicote House (Se-02) on 19 June 2012.

Across 160 measured bullhead, the median measured length was 6.3 cm.

Surveyors recorded weights for 33 bullhead. The median was 0.1 oz (0.004 kg) and the largest recorded weight was 0.3 oz (0.009 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 Aller.

See bullhead records across England →

Most recent observation20 June 2012The Paddock · 31 fish

Largest measured bullhead: 9 cm
Median length: 6.3 cm
Fish measured: 160
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	19 Jun 2012	Holnicote House (Se-02)	131585
8.9 cm	19 Jun 2012	Holnicote House (Se-02)	131585
8.4 cm	22 Oct 1992	Holt	80099
8.3 cm	19 Jun 2012	Holnicote House (Se-02)	131585
8.3 cm	19 Jun 2012	Holnicote House (Se-02)	131585
8.3 cm	22 Oct 1992	Holt	80099
8.2 cm	22 Jul 2010	Holnicote House (Se-02)	123035
8.1 cm	19 Jun 2012	Holnicote House (Se-02)	131585
8 cm	19 Jun 2012	Holnicote House (Se-02)	131585
8 cm	22 Jul 2010	Holnicote House (Se-02)	123035

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
The Paddock	20 Jun 2012	20 Jun 2012	1
Holnicote House (Se-02)	14 Oct 1992	19 Jun 2012	5
Holt	22 Oct 1992	22 Oct 1992	1
Selworthy	19 Oct 1992	19 Oct 1992	1

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

1992–2012

Survey records by year

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

392

093

094

095

096

097

098

099

000

001

102

003

004

005

106

007

008

009

110

011

212

Fish measured by surveyors

Measured length distribution

See how the 160 measured fish were spread across different length ranges.

Smallest: 1.9 cm
Lower quarter: 5 cm
Median: 6.3 cm
Upper quarter: 7.2 cm
Largest: 9 cm

0–99 mm

160

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 33 bullhead. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0.1 oz (0.002 kg)
Median: 0.1 oz (0.004 kg)
Upper quarter: 0.2 oz (0.006 kg)
Heaviest: 0.3 oz (0.009 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 Aller

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

Brown / sea trout European eel

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 →