Bullhead · Cottus gobio

Bullhead in the Tadburn Lake

Largest measured bullhead: 8 cm

The largest bullhead measured in Environment Agency surveys of the Tadburn Lake was 8 cm, recorded at Ashdown Way on 16 October 2006.

Across 165 measured bullhead, the median measured length was 4.9 cm.

Surveyors recorded weights for 60 bullhead. The median was 0.1 oz (0.002 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 Tadburn Lake.

See bullhead records across England →

Most recent observation18 September 2025Crampmoor Ford · 55 fish

Largest measured bullhead: 8 cm
Median length: 4.9 cm
Fish measured: 165
Survey locations: 5

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
8 cm	16 Oct 2006	Ashdown Way	102311
7.6 cm	12 Aug 2005	Ashdown Way	86394
7.5 cm	12 Aug 2005	Ashdown Way	86394
7.2 cm	9 Sept 2025	Ashdown Way	178550
7.2 cm	12 Aug 2005	Ashdown Way	86394
7.1 cm	16 Oct 2006	Ashdown Way	102311
7.1 cm	12 Aug 2005	Ashdown Way	86394
7 cm	18 Sept 2025	Crampmoor Ford	179663
6.9 cm	12 Aug 2005	Ashdown Way	86394
6.7 cm	12 Aug 2005	Ashdown Way	86394

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
Crampmoor Ford	3 Apr 2012	18 Sept 2025	9
Ashdown Way	6 Sept 2002	9 Sept 2025	14
u/s Straight Mile	2 Oct 2015	2 Oct 2015	1
Romsey bypass	5 Apr 2012	5 Apr 2012	1
d/s Crampmoor fish farm	20 Sept 2001	20 Sept 2001	1

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

2001–2025

Survey records by year

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

101

102

103

104

105

106

007

008

009

010

011

312

013

014

115

016

017

218

219

220

221

222

223

224

225

Fish measured by surveyors

Measured length distribution

See how the 165 measured fish were spread across different length ranges.

Smallest: 2 cm
Lower quarter: 3.7 cm
Median: 4.9 cm
Upper quarter: 5.6 cm
Largest: 8 cm

0–99 mm

165

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 60 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 oz (0.001 kg)
Median: 0.1 oz (0.002 kg)
Upper quarter: 0.1 oz (0.003 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 Tadburn Lake

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

Brown / sea trout Stone loach 3-spined stickleback European eel Topmouth gudgeon 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 →