RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Main Lew

Largest measured brook lamprey: 15 cm

The largest brook lamprey measured in Environment Agency surveys of the River Main Lew was 15 cm, recorded at Lew Mill on 10 August 2017.

Across 92 measured brook lamprey, the median measured length was 10.5 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 Main Lew.

See brook lamprey records across England →

Most recent observation19 August 2025Lee · 7 fish
Largest measured brook lamprey
15 cm
Median length
10.5 cm
Fish measured
92
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
15 cm10 Aug 2017Lew Mill151249
14.7 cm4 Aug 2016Stone148850
13.6 cm24 Jul 2024Lew Mill166886
13.6 cm4 Aug 2016Stone148850
13.6 cm13 Aug 2007Lew Mill106342
13.5 cm4 Aug 2016Stone148850
13.3 cm4 Aug 2016Stone148850
13.2 cm4 Aug 2016Stone148850
13.2 cm13 Aug 2007Lew Mill106342
13 cm21 Aug 2023Lee163124

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
Lee14 Jul 200919 Aug 202513
Lew Mill13 Aug 200711 Aug 202512
Stone4 Aug 20165 Aug 20254

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 92 measured fish were spread across different length ranges.

Smallest
5.5 cm
Lower quarter
9 cm
Median
10.5 cm
Upper quarter
11.9 cm
Largest
15 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Lew

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

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

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 →