RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the Kettles Beck

Largest measured brook lamprey: 17 cm

The largest brook lamprey measured in Environment Agency surveys of the Kettles Beck was 17 cm, recorded at Downstream Waters bridge on 25 July 2019.

Across 32 measured brook lamprey, the median measured length was 13 cm.

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

See brook lamprey records across England →

Most recent observation8 August 2025Downstream Waters bridge · 15 fish
Largest measured brook lamprey
17 cm
Median length
13 cm
Fish measured
32
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
17 cm25 Jul 2019Downstream Waters bridge154951
16 cm8 Aug 2025Downstream Waters bridge177912
16 cm8 Aug 2025Downstream Waters bridge177912
16 cm25 Jul 2019Downstream Waters bridge154951
16 cm25 Jul 2019Downstream Waters bridge154951
16 cm1 Aug 2007Downstream Waters bridge121232
15.5 cm6 Sept 2016Downstream Waters bridge149282
15 cm8 Aug 2025Downstream Waters bridge177912
15 cm25 Jul 2019Downstream Waters bridge154951
14 cm8 Aug 2025Downstream Waters bridge177912

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
Downstream Waters bridge1 Aug 20078 Aug 20256
Lanshaw Farm15 Aug 201615 Aug 20161

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

2007–2025

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 32 measured fish were spread across different length ranges.

Smallest
10 cm
Lower quarter
12.8 cm
Median
13 cm
Upper quarter
15 cm
Largest
17 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Kettles Beck

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

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

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 →