Bullhead · Cottus gobio

Bullhead in the UCL surveys

Largest measured bullhead: 9.9 cm

The largest bullhead measured in Environment Agency surveys of the UCL surveys was 9.9 cm, recorded at Open 2 on 12 June 2008.

Across 64 measured bullhead, the median measured length was 5.8 cm.

Surveyors recorded weights for 64 bullhead. The median was 0.1 oz (0.0025 kg) and the largest recorded weight was 0.4 oz (0.01 kg).

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

See bullhead records across England →

Most recent observation16 June 2008Shaded 3 · 8 fish

Largest measured bullhead: 9.9 cm
Median length: 5.8 cm
Fish measured: 64
Survey locations: 6

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
9.9 cm	12 Jun 2008	Open 2	111895
8.5 cm	12 Jun 2008	Open 2	111895
8.5 cm	12 Jun 2008	Open 2	111895
7.6 cm	13 Jun 2008	Open 3	111896
7 cm	15 Jun 2008	Shaded 2	111898
7 cm	15 Jun 2008	Shaded 2	111898
7 cm	13 Jun 2008	Open 3	111896
7 cm	12 Jun 2008	Open 2	111895
7 cm	12 Jun 2008	Open 2	111895
6.7 cm	13 Jun 2008	Open 3	111896

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
Shaded 3	16 Jun 2008	16 Jun 2008	1
Shaded 2	15 Jun 2008	15 Jun 2008	1
Shaded 1	14 Jun 2008	14 Jun 2008	1
Open 3	13 Jun 2008	13 Jun 2008	1
Open 2	12 Jun 2008	12 Jun 2008	1
Open 1	10 Jun 2008	11 Jun 2008	2

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

2008–2008

Survey records by year

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

708

Fish measured by surveyors

Measured length distribution

See how the 64 measured fish were spread across different length ranges.

Smallest: 1.9 cm
Lower quarter: 5 cm
Median: 5.9 cm
Upper quarter: 6.4 cm
Largest: 9.9 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 64 bullhead. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.0001 kg)
Lower quarter: 0.1 oz (0.0017 kg)
Median: 0.1 oz (0.0025 kg)
Upper quarter: 0.1 oz (0.004 kg)
Heaviest: 0.4 oz (0.01 kg)

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

More fish in this river

Explore the UCL surveys

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

Brown / sea trout Brook lamprey

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 →