Bullhead · Cottus gobio

Bullhead in the River Lerryn

Largest measured bullhead: 8.7 cm

The largest bullhead measured in Environment Agency surveys of the River Lerryn was 8.7 cm, recorded at Couch's Mill on 30 August 2000.

Across 709 measured bullhead, the median measured length was 5.1 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 Lerryn.

See bullhead records across England →

Most recent observation12 June 2024Couch's Mill · 9 fish

Largest measured bullhead: 8.7 cm
Median length: 5.1 cm
Fish measured: 709
Survey locations: 3

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
8.7 cm	30 Aug 2000	Couch's Mill	104196
8.1 cm	30 Aug 2000	Couch's Mill	104196
7.9 cm	30 Aug 2000	Couch's Mill	104196
7.9 cm	11 Sept 1997	Boconnoc	135570
7.8 cm	30 Aug 2000	Couch's Mill	104196
7.6 cm	30 Aug 2000	Boconnoc	104195
7.6 cm	30 Aug 2000	Boconnoc	104195
7.6 cm	30 Aug 2000	Boconnoc	104195
7.5 cm	30 Aug 2000	Boconnoc	104195
7.4 cm	30 Aug 2000	Boconnoc	104195

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
Couch's Mill	15 Aug 1994	12 Jun 2024	7
Lerryn	8 Aug 1994	15 Jul 2005	4
Boconnoc	10 Aug 1994	30 Aug 2000	3

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

1994–2024

Survey records by year

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

394

095

096

397

098

099

300

001

002

003

004

205

006

007

008

009

010

011

112

013

014

015

016

017

118

019

020

021

022

023

124

Fish measured by surveyors

Measured length distribution

See how the 709 measured fish were spread across different length ranges.

Smallest: 1.7 cm
Lower quarter: 3.7 cm
Median: 5.1 cm
Upper quarter: 5.9 cm
Largest: 8.7 cm

0–99 mm

709

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Lerryn

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

Brown / sea trout European eel Atlantic salmon

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 →