RiverFish

Bullhead · Cottus gobio

Bullhead in the River Mardle

Largest measured bullhead: 7.7 cm

The largest bullhead measured in Environment Agency surveys of the River Mardle was 7.7 cm, recorded at Brooks Farm (Sp) on 2 August 2021.

Across 13 measured bullhead, the median measured length was 5.9 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 Mardle.

See bullhead records across England →

Most recent observation3 July 2024Brooks Farm (Sp) · 33 fish
Largest measured bullhead
7.7 cm
Median length
5.9 cm
Fish measured
13
Survey locations
3

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
7.7 cm2 Aug 2021Brooks Farm (Sp)160649
7.2 cm2 Aug 2021Brooks Farm (Sp)160649
6.9 cm2 Aug 2021Brooks Farm (Sp)160649
6.2 cm2 Aug 2021Brooks Farm (Sp)160649
6 cm2 Aug 2021Brooks Farm (Sp)160649
6 cm2 Aug 2021Brooks Farm (Sp)160649
5.9 cm2 Aug 2021Brooks Farm (Sp)160649
5.9 cm2 Aug 2021Brooks Farm (Sp)160649
5.7 cm2 Aug 2021Brooks Farm (Sp)160649
5.2 cm2 Aug 2021Brooks Farm (Sp)160649

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
Brooks Farm (Sp)31 May 19963 Jul 20248
U/s Merryfield (Sp/)*15 Aug 201115 Aug 20111
Merryfield (Sp)*15 Jun 199912 Jul 20022

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

1996–2024

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 13 measured fish were spread across different length ranges.

Smallest
4.7 cm
Lower quarter
5.2 cm
Median
5.9 cm
Upper quarter
6.2 cm
Largest
7.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Mardle

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

Brown / sea trout Atlantic salmon European eel

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 →