Brook lamprey · Lampetra planeri

Brook lamprey in the River Main Allen

Largest measured brook lamprey: 14 cm

The largest brook lamprey measured in Environment Agency surveys of the River Main Allen was 14 cm, recorded at Daubuz's Moor on 31 May 2011.

Across 16 measured brook lamprey, the median measured length was 11 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 Allen.

See brook lamprey records across England →

Most recent observation17 August 2022Daubuz's Moor · 2 fish

Largest measured brook lamprey: 14 cm
Median length: 11 cm
Fish measured: 16
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.

Length	Survey date	Survey location	Survey ID
14 cm	31 May 2011	Daubuz's Moor	126542
12.9 cm	31 May 2011	Daubuz's Moor	126542
12.5 cm	12 Oct 2021	Scawswater Mill	160688
11.5 cm	12 Oct 2021	Scawswater Mill	160688
11.5 cm	12 Oct 2021	Scawswater Mill	160688
11.5 cm	12 Oct 2021	Scawswater Mill	160688
11.2 cm	17 Aug 2022	Daubuz's Moor	161607
11 cm	17 Aug 2022	Daubuz's Moor	161607
11 cm	20 May 2022	Lanner Mill	160981
11 cm	12 Oct 2021	Scawswater Mill	160688

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 surveyed	First recorded	Last recorded	Visits finding brook lamprey
Daubuz's Moor	31 May 2011	17 Aug 2022	2
Lanner Mill	20 May 2022	20 May 2022	1
Scawswater Mill	12 Oct 2021	12 Oct 2021	1

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

2011–2022

Survey records by year

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

111

012

013

014

015

016

017

018

019

020

121

222

Fish measured by surveyors

Measured length distribution

See how the 16 measured fish were spread across different length ranges.

Smallest: 6.3 cm
Lower quarter: 10.3 cm
Median: 11 cm
Upper quarter: 11.5 cm
Largest: 14 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Allen

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

Brown / sea trout Bullhead 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 →