RiverFish

Bullhead · Cottus gobio

Bullhead in the River Darent

Largest measured bullhead: 10.6 cm

The largest bullhead measured in Environment Agency surveys of the River Darent was 10.6 cm, recorded at Preston Farm on 11 May 2017.

Across 1,152 measured bullhead, the median measured length was 6 cm.

Surveyors recorded weights for 3 bullhead. The median was 0.1 oz (0.004 kg) and the largest recorded weight was 0.4 oz (0.012 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 Darent.

See bullhead records across England →

Most recent observation22 July 2026Twitton Brook · 7 fish
Largest measured bullhead
10.6 cm
Median length
6 cm
Fish measured
1,152
Survey locations
10

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
10.6 cm11 May 2017Preston Farm150433
10.1 cm23 Apr 2015Preston Farm144633
10 cm25 Aug 2005Preston Farm86600
10 cm11 Aug 2004Preston Farm82622
9.8 cm23 Apr 2015Preston Farm144633
9.7 cm5 Jun 2019Preston Farm154577
9.7 cm11 May 2017Preston Farm150433
9.5 cm22 May 2014Dartford Park141143
9.3 cm11 May 2017Preston Farm150433
9.3 cm11 May 2017Preston Farm150433

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
Twitton Brook19 Aug 200422 Jul 20265
Preston Farm4 Sept 200211 Jun 202617
Lullingstone13 Sept 200710 Jun 202611
Horton Kirby13 Jul 200414 May 202610
Dartford Park29 May 20134 Jun 20244
Hawley Hall1 Jun 201129 May 20245
Sevenoaks Wildfowl Reserve5 Aug 200922 May 20249
Sundridge26 Aug 20043 May 20226
Quebec House Car Park Westerham21 Jun 201121 Jun 20111
Acacia Hall1 Jul 200428 Aug 20093

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

2002–2026

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 1,152 measured fish were spread across different length ranges.

Smallest
1.9 cm
Lower quarter
5.1 cm
Median
6.1 cm
Upper quarter
6.9 cm
Largest
10.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 3 bullhead. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.002 kg)
Lower quarter
0.1 oz (0.003 kg)
Median
0.1 oz (0.004 kg)
Upper quarter
0.3 oz (0.008 kg)
Heaviest
0.4 oz (0.012 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 Darent

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

Gudgeon Roach Perch Brown / sea trout Stone loach Pike

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 →