RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Rother

Largest measured brook lamprey: 14 cm

The largest brook lamprey measured in Environment Agency surveys of the River Rother was 14 cm, recorded at Witherenden Farm d/s Weir on 26 October 2016.

Across 22 measured brook lamprey, the median measured length was 12 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 Rother.

See brook lamprey records across England →

Most recent observation6 August 2025Stonegate · 6 fish
Largest measured brook lamprey
14 cm
Median length
12 cm
Fish measured
22
Survey locations
3

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
14 cm26 Oct 2016Witherenden Farm d/s Weir149933
13.8 cm5 Aug 2025Salehurst180297
13.5 cm26 Oct 2016Witherenden Farm d/s Weir149933
13 cm5 Aug 2025Salehurst180297
13 cm26 Oct 2016Witherenden Farm d/s Weir149933
12.5 cm6 Aug 2025Stonegate178697
12.5 cm6 Aug 2025Stonegate178697
12.5 cm5 Aug 2025Salehurst180297
12.5 cm5 Aug 2025Salehurst180297
12 cm6 Aug 2025Stonegate178697

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
Stonegate6 Aug 20256 Aug 20251
Salehurst5 Aug 20255 Aug 20251
Witherenden Farm d/s Weir26 Oct 201626 Oct 20161

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

2016–2025

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 22 measured fish were spread across different length ranges.

Smallest
9 cm
Lower quarter
11 cm
Median
12 cm
Upper quarter
12.5 cm
Largest
14 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Rother

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

Roach Chub Perch Gudgeon European eel Pike

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 →