RiverFish

Bullhead · Cottus gobio

Bullhead in the River Main Wolf

Largest measured bullhead: 8.6 cm

The largest bullhead measured in Environment Agency surveys of the River Main Wolf was 8.6 cm, recorded at d/s Roadford Dam on 10 September 2021.

Across 4,336 measured bullhead, the median measured length was 4.6 cm.

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

See bullhead records across England →

Most recent observation16 September 2025Wolf Confluence · 157 fish
Largest measured bullhead
8.6 cm
Median length
4.6 cm
Fish measured
4,336
Survey locations
16

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
8.6 cm10 Sept 2021d/s Roadford Dam160596
8.4 cm6 Aug 2015Wolf Confluence145800
8.3 cm3 Aug 2016Wolf Confluence148858
8.1 cm30 Jun 2025Cookworthy Trap177285
8.1 cm5 Jul 2012Rexon132234
8 cm2 Sept 2010Wolf Confluence123693
7.9 cm9 Jul 2024Cookworthy Trap165492
7.8 cm16 Jul 2024Wolf Confluence165671
7.8 cm11 Aug 2016Rexon148914
7.8 cm30 Jul 2013Wolf Confluence137626

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
Wolf Confluence23 Jul 199216 Sept 202529
Rexon17 Jul 199216 Sept 202528
Cookworthy Trap12 Aug 199330 Jun 202526
d/s Roadford Dam8 Sept 200510 Sept 20215
Germansweek3 Aug 199929 Jul 20159
Lower Cookworthy Farm3 Aug 199314 Aug 200913
u/s Cookworthy Trap15 Jul 199220 Jun 200713
d/s Kellacott2 Aug 19931 Sept 200611
Broadwood27 Aug 199310 Aug 20005
d/s Slew Wood27 Aug 19938 Aug 20007
u/s Kellacott24 Jun 19961 Aug 19972
u/s Rexon18 Jul 199718 Jul 19971
u/s Slew Wood7 Jun 199617 Jul 19972
Steep Field12 Jun 199617 Jul 19972
Oxbow12 Jun 199617 Jul 19972
u/s Broadwood7 Jun 19967 Jun 19961

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

1992–2025

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 4,336 measured fish were spread across different length ranges.

Smallest
1.7 cm
Lower quarter
3.1 cm
Median
4.6 cm
Upper quarter
5.6 cm
Largest
8.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Wolf

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

Brown / sea trout Minnow European eel Atlantic salmon Stone loach Brook lamprey

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 →