Bullhead · Cottus gobio

Bullhead in the Hammer Stream

Largest measured bullhead: 7.8 cm

The largest bullhead measured in Environment Agency surveys of the Hammer Stream was 7.8 cm, recorded at Milland on 4 July 2006.

Across 34 measured bullhead, the median measured length was 5 cm.

Surveyors recorded weights for 34 bullhead. The median was 0 oz (0.001 kg) and the largest recorded weight was 0.2 oz (0.005 kg).

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

See bullhead records across England →

Most recent observation29 July 2014D/s Hammer Pond · 45 fish

Largest measured bullhead: 7.8 cm
Median length: 5 cm
Fish measured: 34
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
7.8 cm	4 Jul 2006	Milland	101928
7.2 cm	4 Jul 2006	Milland	101928
6.3 cm	6 Jun 2008	D/s Hammer Pond	111636
6 cm	4 Jul 2006	Milland	101928
6 cm	4 Jul 2006	Milland	101928
5.5 cm	6 Jun 2008	D/s Hammer Pond	111636
5.5 cm	6 Jun 2008	D/s Hammer Pond	111636
5.5 cm	6 Jun 2008	D/s Hammer Pond	111636
5.5 cm	6 Jun 2008	D/s Hammer Pond	111636
5.5 cm	4 Jul 2006	Milland	101928

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
Milland	4 Jul 2006	29 Jul 2014	2
D/s Hammer Pond	19 Sept 2001	29 Jul 2014	3

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

2001–2014

Survey records by year

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

101

002

003

004

005

106

007

108

009

010

011

012

013

214

Fish measured by surveyors

Measured length distribution

See how the 34 measured fish were spread across different length ranges.

Smallest: 1.5 cm
Lower quarter: 4.4 cm
Median: 5 cm
Upper quarter: 5.5 cm
Largest: 7.8 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 34 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 (0.002 kg)
Heaviest: 0.2 oz (0.005 kg)

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

More fish in this river

Explore the Hammer Stream

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

Perch 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 →