RiverFish

Bullhead · Cottus gobio

Bullhead in the River Mole

Largest measured bullhead: 8.6 cm

The largest bullhead measured in Environment Agency surveys of the River Mole was 8.6 cm, recorded at Meath Green Farm, Horley on 30 September 2015.

Across 171 measured bullhead, the median measured length was 5 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 Mole.

See bullhead records across England →

Most recent observation17 July 2025Norbury Park, Near Mickleham · 9 fish
Largest measured bullhead
8.6 cm
Median length
5 cm
Fish measured
171
Survey locations
15

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 cm30 Sept 2015Meath Green Farm, Horley146801
8.6 cm10 Sept 2015Meath Green Farm, Horley146524
8.4 cm14 Oct 2015Downstream Gatwick147327
8.3 cm14 Oct 2015Downstream Gatwick147327
8.1 cm24 Jun 2025Downstream Downside Mill177059
8 cm3 Jul 2025Downstream Painshill178707
8 cm24 Jun 2025Downstream Downside Mill177059
8 cm14 Oct 2015Downstream Gatwick147327
7.8 cm30 Sept 2015Meath Green Farm, Horley146801
7.7 cm17 Jul 2025Norbury Park, Near Mickleham178708

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
Norbury Park, Near Mickleham15 Oct 198517 Jul 20257
Downstream Painshill23 Oct 20073 Jul 20258
Stoke D'Abernon25 Jun 202525 Jun 20251
Downstream Downside Mill25 Feb 199324 Jun 20256
Downstream Gatwick17 Sept 200321 Sept 20226
Horley Swimming Baths17 Oct 200314 Nov 20174
Box Hill11 Feb 199320 Oct 201510
Meath Green Farm, Horley25 Sept 200330 Sept 20156
Randalls Road, Leatherhead18 Feb 199318 Sept 20135
Old Mole Channel18 Sept 200317 Oct 20123
Below Downside Bridge, Cobham.30 Aug 200219 Oct 20053
Below Granthams Bridge, Lambs Green27 Jul 199327 Jul 19931
Norwood Farm Downstream Cobham9 Mar 19939 Mar 19931
St George's playing fields, Stoke D'Abernon23 Feb 199323 Feb 19931
Upstream M25 at Stoke D'Abernon (Left Arm)23 Oct 198623 Oct 19861

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

1985–2025

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 171 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
3.2 cm
Median
5 cm
Upper quarter
6.3 cm
Largest
8.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Mole

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

Roach Dace Chub Gudgeon Minnow 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 →