RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Lumburn

Largest measured brook lamprey: 16.9 cm

The largest brook lamprey measured in Environment Agency surveys of the River Lumburn was 16.9 cm, recorded at d/s Mill Hill on 24 July 2013.

Across 86 measured brook lamprey, the median measured length was 11.9 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 Lumburn.

See brook lamprey records across England →

Most recent observation15 August 2025d/s Mill Hill · 7 fish
Largest measured brook lamprey
16.9 cm
Median length
11.9 cm
Fish measured
86
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
16.9 cm24 Jul 2013d/s Mill Hill138055
16.4 cm24 Jul 2013d/s Mill Hill138055
16 cm24 Jul 2013d/s Mill Hill138055
15.4 cm24 Jul 2013d/s Mill Hill138055
15.4 cm24 Jul 2013d/s Mill Hill138055
15.3 cm24 Jul 2013d/s Mill Hill138055
15.2 cm24 Jul 2013d/s Mill Hill138055
15 cm8 Jul 2021Lamerton160662
15 cm24 Jul 2013d/s Mill Hill138055
14.6 cm30 Jun 2015Lamerton145254

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
d/s Mill Hill16 Sept 200915 Aug 20254
Lamerton7 Jul 200519 Jun 20238

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 brook lamprey that year.

Fish measured by surveyors

Measured length distribution

See how the 86 measured fish were spread across different length ranges.

Smallest
6 cm
Lower quarter
10 cm
Median
11.9 cm
Upper quarter
13.3 cm
Largest
16.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Lumburn

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

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

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 →