Bullhead · Cottus gobio

Bullhead in the River Blakes Gill

Largest measured bullhead: 9.2 cm

The largest bullhead measured in Environment Agency surveys of the River Blakes Gill was 9.2 cm, recorded at Downstream Scolliers Bridge on 5 July 2004.

Across 161 measured bullhead, the median measured length was 6.2 cm.

Surveyors recorded weights for 161 bullhead. The median was 0.1 oz (0.003 kg) and the largest recorded weight was 0.4 oz (0.012 kg).

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

See bullhead records across England →

Most recent observation24 August 2012Downstream Scolliers Bridge · 7 fish

Largest measured bullhead: 9.2 cm
Median length: 6.2 cm
Fish measured: 161
Survey locations: 2

Individual EA measurements

Largest measured bullhead

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

Length	Survey date	Survey location	Survey ID
9.2 cm	5 Jul 2004	Downstream Scolliers Bridge	80302
8.8 cm	15 Jul 2003	Downstream Scolliers Bridge	76914
8.6 cm	5 Aug 2005	Downstream Scolliers Bridge	87443
8.4 cm	15 Jul 2003	Downstream Scolliers Bridge	76914
8.4 cm	10 Jul 2003	Downstream Scolliers Bridge	76629
8.2 cm	5 Aug 2005	Downstream Scolliers Bridge	87443
8.2 cm	15 Jul 2003	Downstream Scolliers Bridge	76914
8.1 cm	5 Aug 2005	Downstream Scolliers Bridge	87443
8.1 cm	5 Jul 2004	Downstream Scolliers Bridge	80302
8 cm	17 Jul 2006	Downstream Scolliers Bridge	101957

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 surveyed	First recorded	Last recorded	Visits finding bullhead
Downstream Scolliers Bridge	15 Aug 2002	24 Aug 2012	8
Upstream Scolliers Bridge	17 Feb 1998	17 Feb 1998	1

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

1998–2012

Survey records by year

Each bar shows how many survey visits recorded bullhead that year.

198

099

000

001

102

203

104

105

106

107

008

009

010

011

112

Fish measured by surveyors

Measured length distribution

See how the 161 measured fish were spread across different length ranges.

Smallest: 1.5 cm
Lower quarter: 5.1 cm
Median: 6.2 cm
Upper quarter: 7.2 cm
Largest: 9.2 cm

0–99 mm

161

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 161 bullhead. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0.1 oz (0.002 kg)
Median: 0.1 oz (0.003 kg)
Upper quarter: 0.2 oz (0.005 kg)
Heaviest: 0.4 oz (0.012 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Blakes Gill

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

Chub Dace European eel Gudgeon Roach 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 →