Bullhead · Cottus gobio

Bullhead in the Grand Union Canal

Largest measured bullhead: 9.3 cm

The largest bullhead measured in Environment Agency surveys of the Grand Union Canal was 9.3 cm, recorded at Ivinghoe Lock on 24 November 1993.

Across 14 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 Grand Union Canal.

See bullhead records across England →

Most recent observation31 January 1994Stoke Bruerne · 1 fish

Largest measured bullhead: 9.3 cm
Median length: 7 cm
Fish measured: 14
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
9.3 cm	24 Nov 1993	Ivinghoe Lock	28797
9.3 cm	20 Mar 1990	Stoke Hammond	28786
8.8 cm	7 Dec 1993	Old Linslade	28800
8.3 cm	28 Jan 1994	Grafton Regis	28811
8.3 cm	30 Nov 1993	Stoke Hammond	28802
8.3 cm	23 Mar 1990	Stoke Bruerne	28796
7.3 cm	20 Dec 1993	Bradwell Waste Tip	28807
6.8 cm	14 Dec 1993	Water Eaton	28803
6.3 cm	28 Jan 1994	Grafton Regis	28811
5.8 cm	20 Dec 1993	Bradwell Waste Tip	28807

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
Stoke Bruerne	23 Mar 1990	31 Jan 1994	2
Grafton Regis	28 Jan 1994	28 Jan 1994	1
Bradwell Waste Tip	27 Mar 1990	20 Dec 1993	2
Linford Manor Park	17 Dec 1993	17 Dec 1993	1
Water Eaton	14 Dec 1993	14 Dec 1993	1
Old Linslade	7 Dec 1993	7 Dec 1993	1
Stoke Hammond	20 Mar 1990	30 Nov 1993	2
Ivinghoe Lock	24 Nov 1993	24 Nov 1993	1

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

1990–1994

Survey records by year

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

390

091

092

693

294

Fish measured by surveyors

Measured length distribution

See how the 14 measured fish were spread across different length ranges.

Smallest: 5.3 cm
Lower quarter: 5.8 cm
Median: 7.1 cm
Upper quarter: 8.3 cm
Largest: 9.3 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Grand Union Canal

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

Perch Common bream Gudgeon Roach Ruffe Pike

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 →