RiverFish

Bullhead · Cottus gobio

Bullhead in the Alleviation of Low Flow (ALF) study

Largest measured bullhead: 12.4 cm

The largest bullhead measured in Environment Agency surveys of the Alleviation of Low Flow (ALF) study was 12.4 cm, recorded at Isle of Wight Farm on 13 May 1999.

Across 153 measured bullhead, the median measured length was 7.1 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Alleviation of Low Flow (ALF) study.

See bullhead records across England →

Most recent observation7 November 2000Denham Country Park · 16 fish
Largest measured bullhead
12.4 cm
Median length
7.1 cm
Fish measured
153
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.

LengthSurvey dateSurvey locationSurvey ID
12.4 cm13 May 1999Isle of Wight Farm126117
11.6 cm13 May 1999Isle of Wight Farm126117
11.2 cm13 May 1999Isle of Wight Farm126117
10.9 cm13 May 1999Isle of Wight Farm126117
10.5 cm24 Oct 2000Isle of Wight Farm126111
10.5 cm22 Jun 2000Isle of Wight Farm126114
10.3 cm22 Jun 2000Isle of Wight Farm126114
10 cm22 Jun 2000Isle of Wight Farm126114
9.8 cm22 Jun 2000Isle of Wight Farm126114
9.8 cm22 Jun 2000Isle of Wight Farm126114

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 surveyedFirst recordedLast recordedVisits finding bullhead
Denham Country Park6 May 19997 Nov 20003
Isle of Wight Farm13 May 199924 Oct 20003
Gerrards Cross STW12 May 199912 May 19991

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

1999–2000

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 153 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
5.7 cm
Median
7.1 cm
Upper quarter
8.1 cm
Largest
12.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Alleviation of Low Flow (ALF) study

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

3-spined stickleback Stone loach

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 →