Bullhead · Cottus gobio

Bullhead in the By Brook main river

Largest measured bullhead: 9.7 cm

The largest bullhead measured in Environment Agency surveys of the By Brook main river was 9.7 cm, recorded at Weavern (Se-03) on 19 July 2010.

Across 495 measured bullhead, the median measured length was 5.5 cm.

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

See bullhead records across England →

Most recent observation11 October 2018Weavern (Se-03) · 249 fish

Largest measured bullhead: 9.7 cm
Median length: 5.5 cm
Fish measured: 495
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.

Length	Survey date	Survey location	Survey ID
9.7 cm	19 Jul 2010	Weavern (Se-03)	123031
9.1 cm	11 Oct 2018	Weavern (Se-03)	153701
9 cm	11 Oct 2018	Weavern (Se-03)	153701
8.9 cm	11 Oct 2018	Weavern (Se-03)	153701
8.5 cm	11 Oct 2018	Weavern (Se-03)	153701
8.5 cm	11 Oct 2018	Weavern (Se-03)	153701
8.4 cm	19 Jul 2010	Slaughterford	122967
8.2 cm	11 Oct 2018	Weavern (Se-03)	153701
8.1 cm	9 Oct 2018	Middlehill	153631
8 cm	11 Oct 2018	Weavern (Se-03)	153701

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
Weavern (Se-03)	20 Apr 1999	11 Oct 2018	3
Middlehill	7 May 1999	9 Oct 2018	3
D/s Bathford Paper mill	12 Sept 2013	12 Sept 2013	1
Gatcombe Mill Brook	18 Apr 2013	18 Apr 2013	1
Gatcombe Mill	23 Mar 1999	18 Apr 2013	3
Slaughterford	15 Apr 1999	19 Jul 2010	2
Castle Combe Golf Course (Se-02)	8 Apr 1999	8 Aug 2002	2
Long Dean	14 Apr 1999	14 Apr 1999	1

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

1999–2018

Survey records by year

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

699

000

001

202

003

004

005

006

007

008

009

210

011

112

313

014

015

016

017

218

Fish measured by surveyors

Measured length distribution

See how the 495 measured fish were spread across different length ranges.

Smallest: 1.6 cm
Lower quarter: 4.2 cm
Median: 5.5 cm
Upper quarter: 6.5 cm
Largest: 9.7 cm

0–99 mm

495

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the By Brook main river

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

Brown / sea trout 3-spined stickleback Minnow Stone loach European eel Brook lamprey

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 →