RiverFish

Bullhead · Cottus gobio

Bullhead in the Main River Marden

Largest measured bullhead: 9.4 cm

The largest bullhead measured in Environment Agency surveys of the Main River Marden was 9.4 cm, recorded at Stanley on 19 May 2011.

Across 71 measured bullhead, the median measured length was 6.6 cm.

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

See bullhead records across England →

Most recent observation28 July 2022Calne STW (Te)
Largest measured bullhead
9.4 cm
Median length
6.6 cm
Fish measured
71
Survey locations
7

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
9.4 cm19 May 2011Stanley126400
8.7 cm19 May 2011Calne STW (Te)126463
8.6 cm19 May 2011Calne STW (Te)126463
8.5 cm19 May 2011Calne STW (Te)126463
8.4 cm11 Jul 2017Sprays Farm (Se-02)150832
8.3 cm11 Jul 2017Sprays Farm (Se-02)150832
8.3 cm19 May 2011Calne STW (Te)126463
8.1 cm19 May 2011Calne STW (Te)126463
8 cm19 May 2011Calne STW (Te)126463
7.9 cm19 May 2011Stanley126400

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
Calne STW (Te)21 May 199828 Jul 20228
Sprays Farm (Se-02)22 May 200211 Jul 20172
Stanley19 May 201119 May 20111
New Leaze Farm15 Oct 199718 Aug 20043
Downstream Calne13 May 199813 May 19981
Dalgety's23 Apr 199823 Apr 19981
Scott's Mill14 Oct 199714 Oct 19971

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

1997–2022

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 71 measured fish were spread across different length ranges.

Smallest
4.2 cm
Lower quarter
5.8 cm
Median
6.6 cm
Upper quarter
7.5 cm
Largest
9.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Main River Marden

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

Brown / sea trout Minnow Roach Gudgeon Dace Stone loach

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 →