RiverFish

Bullhead · Cottus gobio

Bullhead in the Turkey Brook

Largest measured bullhead: 11.8 cm

The largest bullhead measured in Environment Agency surveys of the Turkey Brook was 11.8 cm, recorded at d/s Cuffley Brook confluence on 8 April 2015.

Across 676 measured bullhead, the median measured length was 6.4 cm.

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

See bullhead records across England →

Most recent observation30 June 2026Forty Hall
Largest measured bullhead
11.8 cm
Median length
6.4 cm
Fish measured
676
Survey locations
8

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
11.8 cm8 Apr 2015d/s Cuffley Brook confluence144537
11.7 cm8 Apr 2015d/s Cuffley Brook confluence144537
11.5 cm5 Oct 2015d/s Cuffley Brook confluence146868
11.4 cm8 Apr 2015d/s Cuffley Brook confluence144537
11.4 cm16 Apr 2014d/s Cuffley Brook confluence140666
11.3 cm27 Nov 2013Rotenone neutralisation zone140279
11.2 cm8 Apr 2015d/s Cuffley Brook confluence144537
11 cm20 Oct 2015Forty Hall147258
10.9 cm21 Oct 2015Whitewebbs Golf Course147256
10.9 cm8 Apr 2015d/s Cuffley Brook confluence144537

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
Forty Hall4 May 200630 Jun 20265
Whitewebbs Golf Course13 Dec 201321 Oct 20195
Albany Park4 Dec 201321 Oct 20195
Upstream Albany Park9 Oct 20179 Oct 20171
d/s Cuffley Brook confluence16 Apr 20145 Oct 20154
Rotenone neutralisation zone 227 Nov 201327 Nov 20131
Rotenone neutralisation zone27 Nov 201327 Nov 20131
Forty Hall TMG26 Mar 200920 Apr 20102

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

2006–2026

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 676 measured fish were spread across different length ranges.

Smallest
2.1 cm
Lower quarter
4.8 cm
Median
6.4 cm
Upper quarter
7.9 cm
Largest
11.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Turkey Brook

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

Minnow Stone loach Roach 3-spined stickleback Gudgeon European eel

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 →