RiverFish

Bullhead · Cottus gobio

Bullhead in the River Gade

Largest measured bullhead: 11.4 cm

The largest bullhead measured in Environment Agency surveys of the River Gade was 11.4 cm, recorded at Dacorum College on 21 February 2002.

Across 912 measured bullhead, the median measured length was 5.7 cm.

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

See bullhead records across England →

Most recent observation29 September 2025Gadebridge Park post-enhancement
Largest measured bullhead
11.4 cm
Median length
5.7 cm
Fish measured
912
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
11.4 cm21 Feb 2002Dacorum College79484
11.1 cm21 Feb 2002Dacorum College79484
11 cm12 Feb 2002Gadebridge Park79485
11 cm12 Feb 2002Gadebridge Park79485
11 cm3 Oct 2000Cassiobury Park75768
10.9 cm23 Jul 2004Cura Fisheries81303
10.5 cm6 Jun 2022Gadebridge Park161134
10.5 cm28 Feb 2002Piccotts End79486
10.4 cm21 Feb 2002Dacorum College79484
10 cm21 Feb 2002Dacorum College79484

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
Gadebridge Park post-enhancement29 Sept 202529 Sept 20251
Cura Fisheries23 Jul 200425 Apr 20247
Gadebridge Park12 Feb 20026 Jun 20225
Upstream Gadebridge Lane28 May 202128 May 20211
Gadebridge park pre-ehancement28 May 202128 May 20211
Cassiobury Park3 Oct 200023 Apr 201310
Kings Langley15 Jul 200415 Jul 20041
Great Gaddesden21 May 200421 May 20041
Piccotts End28 Feb 200228 Feb 20021
Dacorum College21 Feb 200221 Feb 20021

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

2000–2025

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 912 measured fish were spread across different length ranges.

Smallest
0.5 cm
Lower quarter
4.4 cm
Median
5.7 cm
Upper quarter
7.1 cm
Largest
11.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Gade

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

Minnow 3-spined stickleback Stone loach Brown / sea trout Roach Perch

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 →