RiverFish

Bullhead · Cottus gobio

Bullhead in the River Ivel

Largest measured bullhead: 9.9 cm

The largest bullhead measured in Environment Agency surveys of the River Ivel was 9.9 cm, recorded at Henlow on 8 May 2013.

Across 225 measured bullhead, the median measured length was 6.3 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 Ivel.

See bullhead records across England →

Most recent observation30 April 2025Girtford Weir · 2 fish
Largest measured bullhead
9.9 cm
Median length
6.3 cm
Fish measured
225
Survey locations
13

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
9.9 cm8 May 2013Henlow135961
9.6 cm4 Jun 2013DS Iron Bridge136221
9.4 cm12 Jun 2013Girtford Weir136340
9.3 cm9 Jun 1989Biggleswade Common29249
9.3 cm13 Mar 1989Henlow29245
9 cm12 Jun 2013Girtford Weir136340
9 cm8 May 2013Henlow135961
9 cm12 May 2005Girtford Weir84561
9 cm8 Jul 2003Girtford Weir76474
9 cm19 Jun 2003Biggleswade Common76471

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
Girtford Weir8 Jul 200330 Apr 20257
DS Iron Bridge3 May 19959 Apr 20259
Biggleswade Common9 Jun 198917 May 201610
Henlow13 Mar 198911 May 201615
Gt Ouse Confluence16 May 199524 Jun 20136
Langford Mill26 Nov 200926 Nov 20091
Saw Mills Tempsford22 Aug 200322 Aug 20031
Henlow Control Site3 May 20003 May 20001
Langford Nursery1 Jun 19981 Jun 19981
Astwick15 Mar 198927 May 19984
Beeston10 May 199510 May 19951
Broom Mill9 May 19959 May 19951
High Romper Bridge21 Jan 199221 Jan 19921

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

1989–2025

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 225 measured fish were spread across different length ranges.

Smallest
2.6 cm
Lower quarter
5.3 cm
Median
6.3 cm
Upper quarter
7.3 cm
Largest
9.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ivel

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

Chub Pike Roach Gudgeon Dace 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 →