Bullhead · Cottus gobio

Bullhead in the River Swilgate

Largest measured bullhead: 10.5 cm

The largest bullhead measured in Environment Agency surveys of the River Swilgate was 10.5 cm, recorded at Tredington on 7 May 2014.

Across 25 measured bullhead, the median measured length was 7.6 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 Swilgate.

See bullhead records across England →

Most recent observation23 August 2024Rails Meadow

Largest measured bullhead: 10.5 cm
Median length: 7.6 cm
Fish measured: 25
Survey locations: 4

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
10.5 cm	7 May 2014	Tredington	140904
9.1 cm	7 May 2014	Tredington	140904
9 cm	7 May 2014	Tredington	140904
8.6 cm	7 May 2014	Tredington	140904
8.4 cm	7 May 2014	Tredington	140904
8.2 cm	7 May 2014	Tredington	140904
8.2 cm	7 May 2014	Tredington	140904
8 cm	7 May 2014	Tredington	140904
8 cm	7 May 2014	Tredington	140904
8 cm	7 May 2014	Tredington	140904

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
Rails Meadow	10 Oct 2013	23 Aug 2024	5
Prior's Park	10 Oct 2013	8 Sept 2016	2
D/s of weir (tidal)	28 Aug 2002	8 Aug 2014	3
Tredington	20 Jan 1976	7 May 2014	2

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

1976–2024

Survey records by year

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

176

077

078

079

080

081

082

083

084

085

086

087

088

089

090

091

092

093

094

095

096

097

098

099

000

001

102

103

004

005

006

007

008

009

010

011

012

213

214

015

216

017

018

019

020

121

122

023

124

Fish measured by surveyors

Measured length distribution

See how the 25 measured fish were spread across different length ranges.

Smallest: 3.5 cm
Lower quarter: 6.3 cm
Median: 7.6 cm
Upper quarter: 8.2 cm
Largest: 10.5 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Swilgate

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

Dace European eel Stone loach Roach 3-spined stickleback Chub

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 →