Bullhead · Cottus gobio

Bullhead in the River Black Sewer

Largest measured bullhead: 9 cm

The largest bullhead measured in Environment Agency surveys of the River Black Sewer was 9 cm, recorded at Black Sewer Upper on 12 August 2004.

Across 124 measured bullhead, the median measured length was 4 cm.

Surveyors recorded weights for 124 bullhead. The median was 0 oz (0.001 kg) and the largest recorded weight was 0.5 oz (0.014 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 Black Sewer.

See bullhead records across England →

Most recent observation15 August 2007Kings Barn Farm, u/s STW · 1 fish

Largest measured bullhead: 9 cm
Median length: 4 cm
Fish measured: 124
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 cm	12 Aug 2004	Black Sewer Upper	82833
9 cm	4 Aug 2003	Black Sewer Upper	76616
8.7 cm	12 Aug 2004	Black Sewer Upper	82833
8.6 cm	4 Aug 2003	Black Sewer Upper	76616
8.5 cm	24 Aug 2005	Black Sewer Upper	87445
8.5 cm	12 Aug 2004	Black Sewer Upper	82833
8.3 cm	24 Aug 2005	Black Sewer Upper	87445
8.3 cm	24 Aug 2005	Black Sewer Upper	87445
8.3 cm	24 Aug 2005	Black Sewer Upper	87445
8.1 cm	24 Aug 2005	Black Sewer Upper	87445

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
Kings Barn Farm, u/s STW	15 Aug 2006	15 Aug 2007	2
Black Sewer Upper	27 Aug 2002	24 Aug 2005	4

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

2002–2007

Survey records by year

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

102

103

104

105

106

107

Fish measured by surveyors

Measured length distribution

See how the 124 measured fish were spread across different length ranges.

Smallest: 2.3 cm
Lower quarter: 3.4 cm
Median: 4 cm
Upper quarter: 6.5 cm
Largest: 9 cm

0–99 mm

124

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 124 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 oz (0.001 kg)
Median: 0 oz (0.001 kg)
Upper quarter: 0.1 oz (0.004 kg)
Heaviest: 0.5 oz (0.014 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 Black Sewer

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

Brown / sea trout Stone loach European eel 3-spined stickleback Chub Flounder

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 →