RiverFish

Bullhead · Cottus gobio

Bullhead in the River Ouzel

Largest measured bullhead: 11.1 cm

The largest bullhead measured in Environment Agency surveys of the River Ouzel was 11.1 cm, recorded at Eton Bray on 24 May 2013.

Across 552 measured bullhead, the median measured length was 7.1 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 Ouzel.

See bullhead records across England →

Most recent observation16 April 2026DS Caldecote Mill
Largest measured bullhead
11.1 cm
Median length
7.1 cm
Fish measured
552
Survey locations
15

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
11.1 cm24 May 2013Eton Bray136093
11 cm18 Jun 2013US Billington136436
11 cm29 Mar 2006Leighton Buzzard90697
10.7 cm3 Jun 2013Leighton Buzzard136275
10.6 cm18 Jun 2013US Billington136436
10.6 cm18 Jun 2013US Billington136436
10.6 cm18 Jun 2013US Billington136436
10.5 cm3 Jun 2013Leighton Buzzard136275
10.4 cm21 Mar 2016US Leighton Buzzard147895
10.4 cm18 Jun 2013US Billington136436

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
DS Caldecote Mill17 Jun 201316 Apr 20263
Open University4 Jan 19955 Aug 202514
Manor Sports Field14 Dec 199431 Jul 202515
Leighton Buzzard13 Dec 19948 Jul 201913
US Open University3 Sept 20146 Oct 20174
Newport Pagnell28 Jan 199810 Aug 20163
US Leighton Buzzard21 Mar 201621 Mar 20161
US Billington12 Apr 200718 Jun 20132
Eton Bray24 May 201324 May 20131
M1 Road Bridge8 Nov 199013 May 20105
Caldecote Mill29 Mar 199512 May 20108
Castle Meadow22 Nov 199030 Apr 20096
Simpson Ouzel15 Dec 199429 Mar 20043
Stoke Hammond5 Dec 199724 Mar 20042
Billington26 Nov 199726 Nov 19971

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

1990–2026

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 552 measured fish were spread across different length ranges.

Smallest
1.7 cm
Lower quarter
5.8 cm
Median
7.1 cm
Upper quarter
8.1 cm
Largest
11.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ouzel

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

Gudgeon Perch Roach Dace Minnow 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 →