RiverFish

Bullhead · Cottus gobio

Bullhead in the River Calder

Largest measured bullhead: 64.6 cm

The largest bullhead measured in Environment Agency surveys of the River Calder was 64.6 cm, recorded at Warmans Industrial Estate on 22 August 2003.

Across 1,281 measured bullhead, the median measured length was 6.5 cm.

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

See bullhead records across England →

Most recent observation2 October 2025Lydgate
Largest measured bullhead
64.6 cm
Median length
6.5 cm
Fish measured
1,281
Survey locations
19

Individual EA measurements

Largest measured bullhead

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
64.6 cm22 Aug 2003Warmans Industrial Estate78674
11.6 cm24 Jun 2015Elland power Station d/s145165
11.4 cm13 Aug 2013Elland power Station d/s140064
11.3 cm24 Jun 2015Elland power Station d/s145165
10.9 cm13 Aug 2013Elland power Station d/s140064
10.9 cm22 Jul 2004Elland power Station d/s83553
10.8 cm4 Jul 2008Elland power Station d/s111875
10.8 cm2 Sept 2007Brighouse Industrial Estate108405
10.6 cm31 Jul 2006Elland power Station d/s101598
10.6 cm22 Jul 2004Elland power Station d/s83553

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 surveyedFirst recordedLast recordedVisits finding bullhead
Lydgate23 Jun 19992 Oct 20256
Warmans Industrial Estate23 Jun 199927 Aug 202515
Dewsbury (end of flood relief channel)30 Jul 201223 Jul 20242
Elland power Station d/s8 Jul 20022 Jul 202412
Chantry Bridge10 Jul 200224 Jun 20247
Hebden Bridge Train Station15 Oct 202115 Oct 20211
Hebble End (Co-op Car Park)8 Sept 200915 Oct 20214
Dewsbury Fry Survey22 Aug 201722 Aug 20171
Todmorden Bus Station22 Aug 20034 Aug 20153
Stoodley Glen8 Sept 20094 Aug 20152
Burnley Road14 Oct 20104 Aug 20152
Smalley Bight24 Jun 201524 Jun 20151
Brighouse - Fry Survey21 Aug 201221 Aug 20121
Cornmill Weir9 Jul 20027 Jul 20108
Brighouse Industrial Estate9 Jul 20026 Jul 20108
Eastwood S.T.W26 Aug 200312 Oct 20042
Brearley Weir25 Jun 199926 Aug 20032
Ravensthorpe at weir (old site)11 Jul 200211 Jul 20021
High Royds S.T.W25 Jun 199925 Jun 19991

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

1999–2025

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 1,281 measured fish were spread across different length ranges.

Smallest
1.5 cm
Lower quarter
5.6 cm
Median
6.5 cm
Upper quarter
7.5 cm
Largest
64.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Calder

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

Brown / sea trout Stone loach Gudgeon Chub Roach Perch

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 →