RiverFish

Bullhead · Cottus gobio

Bullhead in the River Gaunless

Largest measured bullhead: 9.2 cm

The largest bullhead measured in Environment Agency surveys of the River Gaunless was 9.2 cm, recorded at River Gaunless at The Slack on 13 July 2009.

Across 46 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 Gaunless.

See bullhead records across England →

Most recent observation26 September 2025River Gaunless at The Slack
Largest measured bullhead
9.2 cm
Median length
7.1 cm
Fish measured
46
Survey locations
13

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
9.2 cm13 Jul 2009River Gaunless at The Slack121072
9 cm24 Sept 2008River Gaunless at Spring Garden114781
8.6 cm24 Sept 2008River Gaunless at Spring Garden114781
8.5 cm13 Jul 2009River Gaunless at The Slack121072
8.5 cm24 Sept 2008River Gaunless at Spring Garden114781
8.2 cm13 Jul 2009River Gaunless at The Slack121072
8.2 cm24 Sept 2008River Gaunless at Spring Garden114781
8.1 cm13 Jul 2009River Gaunless at The Slack121072
8 cm13 Jul 2009River Gaunless at The Slack121072
8 cm24 Sept 2008River Gaunless at Spring Garden114781

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
River Gaunless at The Slack11 Sept 200226 Sept 202516
River Gaunless at Spring Garden18 Sept 200325 Sept 202512
River Gaunless Spring Garden u/s flood defence25 Sept 202525 Sept 20251
River Gaunless at South Church16 Jul 20175 Oct 20232
River Gaunless at Hummer Beck18 Sept 20035 Oct 20234
River Gaunless u/s of Spring Garden2 Oct 20232 Oct 20231
River Gaunless at Lowlands18 Sept 200327 Sept 20235
River Gaunless at Copley18 Sept 200326 Sept 20234
Hummer Beck at Hummer Beck Farm16 Jul 20175 Sept 20232
River Gaunless at Auckland Castle19 Sept 200316 Jul 20174
River Gaunless at Evenwood18 Sept 200314 Jul 20173
River Gaunless at Fylands Bridge29 Aug 201315 Jul 20142
River Gaunless at Ramshaw14 Sept 200722 Aug 20112

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

2002–2025

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 46 measured fish were spread across different length ranges.

Smallest
2.5 cm
Lower quarter
6 cm
Median
7.1 cm
Upper quarter
7.7 cm
Largest
9.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Gaunless

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

Brown / sea trout Minnow Stone loach 3-spined stickleback European eel Atlantic salmon

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 →