RiverFish

Bullhead · Cottus gobio

Bullhead in the River Blackwater

Largest measured bullhead: 10.3 cm

The largest bullhead measured in Environment Agency surveys of the River Blackwater was 10.3 cm, recorded at Stisted FGS on 4 September 2014.

Across 1,093 measured bullhead, the median measured length was 5.4 cm.

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

See bullhead records across England →

Most recent observation8 November 2023Dorewards Hall · 12 fish
Largest measured bullhead
10.3 cm
Median length
5.4 cm
Fish measured
1,093
Survey locations
18

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
10.3 cm4 Sept 2014Stisted FGS144097
9.8 cm4 Oct 2011Greys Mill128389
9.4 cm24 Feb 1987Stisted FGS14070
9.2 cm19 Sept 2008Ashmans Farm114749
9.2 cm2 Oct 2002Greys Mill67120
9.1 cm22 Sept 2008Greys Mill114680
9 cm4 Oct 2023Greys Mill164390
9 cm21 Oct 2014Rye Mill143695
9 cm28 Sept 2005Ashmans Farm86463
9 cm24 Feb 1987Stisted FGS14070

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
Dorewards Hall23 Aug 20058 Nov 20233
Smallands Hall10 Aug 198412 Oct 202310
Braxted FGS30 Aug 200111 Oct 202312
Upstream Braxted Hall7 Oct 20027 Oct 20237
Greys Mill2 Oct 20024 Oct 20237
Saint Marys Road27 Sept 20053 Oct 20234
Stock Hall10 Oct 20021 Oct 20236
Blue Mills27 Apr 198728 Sept 202313
Coggeshall13 Oct 200926 Sept 20235
Kelvedon Coalyard13 Apr 198723 Sept 20233
Rye Mill22 Sept 201121 Sept 20233
Bradwell Hall11 May 199319 Sept 20238
Stisted FGS24 Feb 198715 Sept 202315
Langford9 Oct 20089 Oct 20081
Ashmans Farm3 Oct 200219 Sept 20083
West Mill9 Apr 19908 Sept 20084
Lyons Hall (River Blackwater)30 Aug 20052 Sept 20082
Downstream Braxted Hall17 Oct 200517 Oct 20051

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

1984–2023

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 1,093 measured fish were spread across different length ranges.

Smallest
3 cm
Lower quarter
4.6 cm
Median
5.4 cm
Upper quarter
6.6 cm
Largest
10.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Blackwater

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

Roach Chub Gudgeon European eel Perch Dace

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 →