Bullhead · Cottus gobio

Bullhead in the River Blackwater (Reepham)

Largest measured bullhead: 12.4 cm

The largest bullhead measured in Environment Agency surveys of the River Blackwater (Reepham) was 12.4 cm, recorded at Downstream Eades Mill on 24 April 2003.

Across 1,158 measured bullhead, the median measured length was 5.6 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 (Reepham).

See bullhead records across England →

Most recent observation17 June 2015Downstream Eades Mill · 38 fish

Largest measured bullhead: 12.4 cm
Median length: 5.6 cm
Fish measured: 1,158
Survey locations: 2

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
12.4 cm	24 Apr 2003	Downstream Eades Mill	75939
11.2 cm	4 Apr 1990	Downstream Eades Mill	17139
11 cm	12 May 1994	Downstream Eades Mill	17141
10.8 cm	24 Apr 2003	Downstream Eades Mill	75939
10.8 cm	4 Apr 1990	Downstream Eades Mill	17139
10.4 cm	26 Oct 2009	Downstream Eades Mill	119789
10.4 cm	20 Jun 1997	Downstream Eades Mill	17143
10.4 cm	12 May 1994	Downstream Eades Mill	17141
10.3 cm	24 Apr 2003	Downstream Eades Mill	75939
10.3 cm	7 Mar 1986	Downstream Blackwater Bridge	17138

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
Downstream Eades Mill	4 Apr 1990	17 Jun 2015	6
Downstream Blackwater Bridge	7 Mar 1986	18 Jun 1997	4

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

1986–2015

Survey records by year

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

186

087

088

089

290

091

092

093

294

095

096

297

098

099

000

001

002

103

004

005

006

007

008

109

010

011

012

013

014

115

Fish measured by surveyors

Measured length distribution

See how the 1,158 measured fish were spread across different length ranges.

Smallest: 2.6 cm
Lower quarter: 4.6 cm
Median: 5.6 cm
Upper quarter: 6.7 cm
Largest: 12.4 cm

0–99 mm

1143

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Blackwater (Reepham)

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

Brown / sea trout Stone loach Chub Minnow 3-spined stickleback Gudgeon

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 →