Bullhead · Cottus gobio

Bullhead in the Blockley Brook

Largest measured bullhead: 9.4 cm

The largest bullhead measured in Environment Agency surveys of the Blockley Brook was 9.4 cm, recorded at Northwick Mill on 17 October 1990.

Across 57 measured bullhead, the median measured length was 6.2 cm.

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

See bullhead records across England →

Most recent observation13 August 2013Stapenhill Farmhouse · 21 fish

Largest measured bullhead: 9.4 cm
Median length: 6.2 cm
Fish measured: 57
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
9.4 cm	17 Oct 1990	Northwick Mill	80676
9 cm	29 Jun 1994	Northwick Mill	72884
8.4 cm	13 Aug 2013	Stapenhill Farmhouse	138006
8.4 cm	8 Sept 1999	Stapenhill Farmhouse	72885
8.1 cm	13 Aug 2013	Stapenhill Farmhouse	138006
8 cm	29 Jun 1994	Northwick Mill	72884
7.8 cm	8 Sept 1999	Stapenhill Farmhouse	72885
7.8 cm	8 Sept 1999	Northwick Mill	72883
7.8 cm	17 Oct 1990	Northwick Mill	80676
7.7 cm	13 Aug 2013	Stapenhill Farmhouse	138006

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
Stapenhill Farmhouse	17 Oct 1990	13 Aug 2013	5
Northwick Mill	17 Oct 1990	20 Aug 2004	4

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

1990–2013

Survey records by year

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

290

091

092

093

294

095

096

097

098

299

000

001

002

003

204

005

006

007

008

009

010

011

012

113

Fish measured by surveyors

Measured length distribution

See how the 57 measured fish were spread across different length ranges.

Smallest: 1.8 cm
Lower quarter: 5.4 cm
Median: 6.2 cm
Upper quarter: 7.3 cm
Largest: 9.4 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Blockley Brook

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

Brown / sea trout

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 →