RiverFish

Bullhead · Cottus gobio

Bullhead in the River Main Penpont

Largest measured bullhead: 8 cm

The largest bullhead measured in Environment Agency surveys of the River Main Penpont was 8 cm, recorded at Bowithick on 18 June 2015.

Across 597 measured bullhead, the median measured length was 5.1 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 Main Penpont.

See bullhead records across England →

Most recent observation2 July 2025Trerithick · 10 fish
Largest measured bullhead
8 cm
Median length
5.1 cm
Fish measured
597
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.

LengthSurvey dateSurvey locationSurvey ID
8 cm18 Jun 2015Bowithick145091
7.7 cm15 Aug 2011Trekennick127462
7.5 cm29 Jul 2015Trekennick145709
7.5 cm18 Jun 2015Bowithick145091
7.5 cm15 Aug 2011Trekennick127462
7.5 cm15 Aug 2011Trekennick127462
7.5 cm8 Jul 2009Trerithick117767
7.5 cm8 Jul 2009Trerithick117767
7.5 cm24 Jun 2009Bowithick117507
7.4 cm20 Jun 2013Trerithick136755

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
Trerithick5 Jul 19842 Jul 202518
Trekennick25 Jun 198423 Aug 202112
Bowithick25 Jun 198422 Jun 20218
d/s Finches Bridge (spawning bed C )21 Jun 200821 Jun 20081
Finches Bridge25 Jun 198420 Jul 20056
Tresmaine27 Jul 198419 Aug 19994
d/s Finches Bridge (spawning bed B)13 Aug 199321 Jun 19962
d/s Finches Bridge (spawning bed A)13 Aug 199313 Aug 19931

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

1984–2025

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 597 measured fish were spread across different length ranges.

Smallest
1.8 cm
Lower quarter
4.5 cm
Median
5.1 cm
Upper quarter
5.9 cm
Largest
8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Penpont

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

Brown / sea trout Atlantic salmon European eel Minnow Brook lamprey 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 →