RiverFish

Bullhead · Cottus gobio

Bullhead in the River Old Windsor

Largest measured bullhead: 6.7 cm

The largest bullhead measured in Environment Agency surveys of the River Old Windsor was 6.7 cm, recorded at Old Windsor Downstream Fry on 18 August 2010.

Across 9 measured bullhead, the median measured length was 4.6 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 Old Windsor.

See bullhead records across England →

Most recent observation23 August 2017Old Windsor Downstream Fry · 6 fish
Largest measured bullhead
6.7 cm
Median length
4.6 cm
Fish measured
9
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.

LengthSurvey dateSurvey locationSurvey ID
6.7 cm18 Aug 2010Old Windsor Downstream Fry124549
5.2 cm19 Aug 2009Old Windsor Upstream Fry120797
4.8 cm19 Aug 2009Old Windsor Upstream Fry120797
4.6 cm23 Aug 2017Old Windsor Downstream Fry151495
4.6 cm23 Aug 2017Old Windsor Downstream Fry151495
4.2 cm18 Aug 2010Old Windsor Downstream Fry124549
3.8 cm18 Aug 2010Old Windsor Downstream Fry124549
3.6 cm18 Aug 2010Old Windsor Downstream Fry124549
3.4 cm19 Aug 2009Old Windsor Downstream Fry120702

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
Old Windsor Downstream Fry9 Sept 200423 Aug 20174
Old Windsor Upstream Fry19 Aug 200919 Aug 20091

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

2004–2017

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 9 measured fish were spread across different length ranges.

Smallest
3.4 cm
Lower quarter
3.8 cm
Median
4.6 cm
Upper quarter
4.8 cm
Largest
6.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Old Windsor

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

Dace Gudgeon Chub Roach Minnow Bleak

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 →