RiverFish

Bullhead · Cottus gobio

Bullhead in the River Candover

Largest measured bullhead: 9 cm

The largest bullhead measured in Environment Agency surveys of the River Candover was 9 cm, recorded at Duck meadow on 11 August 2025.

Across 613 measured bullhead, the median measured length was 4.5 cm.

Surveyors recorded weights for 4 bullhead. The median was 0.2 oz (0.006 kg) and the largest recorded weight was 0.3 oz (0.008 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 Candover.

See bullhead records across England →

Most recent observation18 August 2025Abbotstone · 129 fish
Largest measured bullhead
9 cm
Median length
4.5 cm
Fish measured
613
Survey locations
9

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
9 cm11 Aug 2025Duck meadow177875
8.6 cm17 Aug 2010Abbotstone123812
8.4 cm18 Aug 2025Abbotstone179697
8.4 cm11 Aug 2025Duck meadow177875
8.4 cm8 Aug 2005Abbotstone86153
8.4 cm8 Aug 2005Abbotstone86153
8.2 cm18 Aug 2025Abbotstone179697
8.1 cm18 Aug 2025Abbotstone179697
8 cm18 Aug 2025Abbotstone179697
8 cm14 Aug 2025Granny Goss riffle178172

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
Abbotstone11 Sept 200318 Aug 202519
Granny Goss riffle8 Sept 200914 Aug 202513
Duck meadow8 Sept 200911 Aug 20259
d/s Fobdown8 Sept 200923 Jul 20213
Folly Main9 Sept 200919 Jul 20213
Upper Fobdown restoration site20 Oct 201520 Oct 20151
Lower Fobdown restoration site20 Oct 201520 Oct 20151
Granny Goss restoration site26 Sept 20112 Oct 20133
Castle Meadow2 Oct 20132 Oct 20131

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

2003–2025

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 613 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
3.7 cm
Median
4.5 cm
Upper quarter
5.6 cm
Largest
9 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 4 bullhead. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.004 kg)
Lower quarter
0.2 oz (0.0055 kg)
Median
0.2 oz (0.006 kg)
Upper quarter
0.2 oz (0.0065 kg)
Heaviest
0.3 oz (0.008 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 Candover

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

Brown / sea trout Minnow 3-spined stickleback Atlantic salmon Stone loach 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 →