RiverFish

Bullhead · Cottus gobio

Bullhead in the Lee Navigation

Largest measured bullhead: 10 cm

The largest bullhead measured in Environment Agency surveys of the Lee Navigation was 10 cm, recorded at Ware Priory on 23 September 2003.

Across 54 measured bullhead, the median measured length was 5.5 cm.

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

See bullhead records across England →

Most recent observation16 September 2025Upstream Carthagena Lock
Largest measured bullhead
10 cm
Median length
5.5 cm
Fish measured
54
Survey locations
7

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 cm23 Sept 2003Ware Priory77073
9.5 cm23 Sept 2003Ware Priory77073
9.3 cm7 Oct 2004Ware Priory82728
8.4 cm7 Oct 2004Ware Priory82728
7.8 cm10 Oct 2002Ware Priory72657
7.2 cm30 Aug 2005Ware Priory86576
7.2 cm7 Oct 2004Ware Priory82728
7 cm10 Oct 2002Ware Priory72657
7 cm10 Oct 2002Ware Priory72657
6.8 cm7 Oct 2004Ware Priory82728

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
Upstream Carthagena Lock16 Sept 202516 Sept 20251
Enfield Lock2 Sept 20057 Aug 20254
Ponders End29 Aug 20235 Aug 20253
Picketts Lock25 Jul 202310 Jul 20253
Hertford Basin20 Jul 20098 Jul 20255
Rye House30 Mar 201230 Mar 20121
Ware Priory10 Oct 200220 Aug 20095

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

2002–2025

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 54 measured fish were spread across different length ranges.

Smallest
2.9 cm
Lower quarter
4.1 cm
Median
5.5 cm
Upper quarter
6.5 cm
Largest
10 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Lee Navigation

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

Roach Perch Pike Chub Bleak Tench

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 →