RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the Kellacott Stream

Largest measured brook lamprey: 13.5 cm

The largest brook lamprey measured in Environment Agency surveys of the Kellacott Stream was 13.5 cm, recorded at Upcott Mill on 28 August 2019.

Across 12 measured brook lamprey, the median measured length was 11.1 cm.

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

See brook lamprey records across England →

Most recent observation11 September 2025Drownsmill · 4 fish
Largest measured brook lamprey
13.5 cm
Median length
11.1 cm
Fish measured
12
Survey locations
2

Individual EA measurements

Largest measured brook lamprey

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

LengthSurvey dateSurvey locationSurvey ID
13.5 cm28 Aug 2019Upcott Mill155575
13.4 cm18 Aug 2015Upcott Mill146036
12.7 cm18 Aug 2015Upcott Mill146036
12.4 cm25 Jul 2022Upcott Mill161503
12 cm18 Aug 2015Upcott Mill146036
11.1 cm19 Aug 2025Upcott Mill178932
11 cm11 Sept 2025Drownsmill179358
11 cm11 Sept 2025Drownsmill179358
10.9 cm19 Aug 2025Upcott Mill178932
10.2 cm19 Aug 2025Upcott Mill178932

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where brook lamprey were found

Each point marks a survey location with at least one brook lamprey 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 brook lamprey
Drownsmill11 Sept 202511 Sept 20251
Upcott Mill18 Aug 201519 Aug 20254

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

2015–2025

Survey records by year

Each bar shows how many survey visits recorded brook lamprey that year.

Fish measured by surveyors

Measured length distribution

See how the 12 measured fish were spread across different length ranges.

Smallest
9.5 cm
Lower quarter
10.7 cm
Median
11.1 cm
Upper quarter
12.5 cm
Largest
13.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Kellacott Stream

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

Brown / sea trout Bullhead Stone loach Atlantic salmon Minnow European eel

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 →