Bullhead · Cottus gobio

Bullhead in the Kirklees Brook

Largest measured bullhead: 9.7 cm

The largest bullhead measured in Environment Agency surveys of the Kirklees Brook was 9.7 cm, recorded at Iwki01 on 4 September 2002.

Across 205 measured bullhead, the median measured length was 4.9 cm.

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

See bullhead records across England →

Most recent observation23 September 2025Iwki01

Largest measured bullhead: 9.7 cm
Median length: 4.9 cm
Fish measured: 205
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	4 Sept 2002	Iwki01	60161
9.6 cm	4 Sept 2002	Site A	60240
9.6 cm	4 Sept 2002	Site C	60181
9.6 cm	4 Sept 2002	Iwki01	60161
9.5 cm	4 Sept 2002	Site C	60181
9.5 cm	4 Sept 2002	Site C	60181
9.5 cm	4 Sept 2002	Iwki01	60161
9.4 cm	4 Sept 2002	Iwki01	60161
9.3 cm	4 Sept 2002	Site A	60240
9.3 cm	4 Sept 2002	Iwki01	60161

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
Iwki01	4 Sept 2002	23 Sept 2025	4
Iwki04	7 Aug 2013	7 Aug 2013	1
Site C	4 Sept 2002	4 Sept 2002	1
Site B	4 Sept 2002	4 Sept 2002	1
Site A	4 Sept 2002	4 Sept 2002	1
Kb03	17 Jan 1997	17 Jan 1997	1
Kb02	17 Jan 1997	17 Jan 1997	1
Kb01	17 Jan 1997	17 Jan 1997	1

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

1997–2025

Survey records by year

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

397

098

099

000

001

402

003

004

005

006

007

008

009

010

011

012

213

014

015

016

017

018

119

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 205 measured fish were spread across different length ranges.

Smallest: 2.6 cm
Lower quarter: 4.3 cm
Median: 4.9 cm
Upper quarter: 7.8 cm
Largest: 9.7 cm

0–99 mm

205

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Kirklees Brook

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

Brown / sea trout Minnow 3-spined stickleback

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 →