Bullhead · Cottus gobio

Bullhead in the River Tonge

Largest measured bullhead: 9.4 cm

The largest bullhead measured in Environment Agency surveys of the River Tonge was 9.4 cm, recorded at Crto10 on 28 June 2004.

Across 36 measured bullhead, the median measured length was 7 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 Tonge.

See bullhead records across England →

Most recent observation1 October 2025Crto05

Largest measured bullhead: 9.4 cm
Median length: 7 cm
Fish measured: 36
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	28 Jun 2004	Crto10	81659
9.3 cm	29 Jun 2004	Crto05	81657
9.2 cm	28 Jun 2004	Crto10	81659
8.1 cm	28 Jun 2004	Crto10	81659
8 cm	29 Jun 2004	Crto05	81657
8 cm	28 Jun 2004	Crto10	81659
7.9 cm	28 Jun 2004	Crto10	81659
7.8 cm	29 Jun 2004	Crto05	81657
7.7 cm	29 Jun 2004	Crto05	81657
7.6 cm	28 Jun 2004	Crto10	81659

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
Crto05	29 Jun 2004	1 Oct 2025	4
Crto10	28 Jun 2004	7 Jun 2005	2

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

2004–2025

Survey records by year

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

204

105

006

007

008

009

010

111

012

013

014

015

016

017

018

019

020

021

022

123

024

125

Fish measured by surveyors

Measured length distribution

See how the 36 measured fish were spread across different length ranges.

Smallest: 2.4 cm
Lower quarter: 5.8 cm
Median: 7 cm
Upper quarter: 7.6 cm
Largest: 9.4 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Tonge

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

Brown / sea trout Minnow Stone loach

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 →