Brook lamprey · Lampetra planeri

Brook lamprey in the River Lee

Largest measured brook lamprey: 18.1 cm

The largest brook lamprey measured in Environment Agency surveys of the River Lee was 18.1 cm, recorded at Fishers Green on 4 July 2013.

Across 91 measured brook lamprey, the median measured length was 14 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 Lee.

See brook lamprey records across England →

Most recent observation29 July 2025Fishers Green · 1 fish

Largest measured brook lamprey: 18.1 cm
Median length: 14 cm
Fish measured: 91
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
18.1 cm	4 Jul 2013	Fishers Green	136956
17.8 cm	2 Jul 2013	Amwell Loop	136870
17.4 cm	11 Oct 2002	Amwell Loop	72635
17.2 cm	14 Jul 2015	Fishers Green	145510
17.2 cm	2 Jul 2013	Amwell Loop	136870
17 cm	7 Aug 2007	Fishers Green	106279
17 cm	11 Oct 2002	Amwell Loop	72635
17 cm	11 Oct 2002	Amwell Loop	72635
17 cm	11 Oct 2002	Amwell Loop	72635
16.7 cm	10 Jul 2017	Amwell Loop	150798

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
Fishers Green	7 Aug 2007	29 Jul 2025	6
Amwell Loop	11 Oct 2002	10 Jul 2017	9
Hartham Common	21 Sept 2004	21 Sept 2004	1

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

2002–2025

Survey records by year

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

102

103

204

005

006

207

108

009

010

011

112

213

114

215

116

117

018

019

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 91 measured fish were spread across different length ranges.

Smallest: 7.5 cm
Lower quarter: 12.7 cm
Median: 14 cm
Upper quarter: 15.3 cm
Largest: 18.1 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Lee

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

Roach Perch Gudgeon Minnow Chub 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 →