RiverFish

Bullhead · Cottus gobio

Bullhead in the Boulters Weir Stream

Largest measured bullhead: 6.7 cm

The largest bullhead measured in Environment Agency surveys of the Boulters Weir Stream was 6.7 cm, recorded at Boulters Weir Downstream Fry on 30 August 2023.

Across 145 measured bullhead, the median measured length was 3.8 cm.

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

See bullhead records across England →

Most recent observation4 September 2025Boulters Weir Upstream Fry · 31 fish
Largest measured bullhead
6.7 cm
Median length
3.8 cm
Fish measured
145
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 cm30 Aug 2023Boulters Weir Downstream Fry164275
6.6 cm27 Aug 2013Boulters Weir Downstream Fry138566
6.5 cm4 Sept 2025Boulters Weir Upstream Fry178509
6 cm4 Sept 2025Boulters Weir Upstream Fry178509
6 cm31 Aug 2006Boulters Weir Downstream Fry111832
6 cm31 Aug 2006Boulters Weir Downstream Fry111832
6 cm31 Aug 2006Boulters Weir Downstream Fry111832
6 cm31 Aug 2006Boulters Weir Downstream Fry111832
5.9 cm31 Aug 2006Boulters Weir Downstream Fry111832
5.8 cm31 Aug 2006Boulters Weir Downstream Fry111832

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
Boulters Weir Upstream Fry30 Aug 20054 Sept 20258
Boulters Weir Downstream Fry31 Aug 20064 Sept 20259

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

2005–2025

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 145 measured fish were spread across different length ranges.

Smallest
2.3 cm
Lower quarter
3.4 cm
Median
3.8 cm
Upper quarter
4.3 cm
Largest
6.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Boulters Weir Stream

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

Minnow Dace Roach Bleak Chub Gudgeon

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 →