Brook lamprey · Lampetra planeri

Brook lamprey in the River St Neot

Largest measured brook lamprey: 11.9 cm

The largest brook lamprey measured in Environment Agency surveys of the River St Neot was 11.9 cm, recorded at Pengelly Bridge on 28 June 2012.

Across 22 measured brook lamprey, the median measured length was 9.1 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 St Neot.

See brook lamprey records across England →

Most recent observation9 July 2024Pengelly Bridge · 3 fish

Largest measured brook lamprey: 11.9 cm
Median length: 9.1 cm
Fish measured: 22
Survey locations: 4

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
11.9 cm	28 Jun 2012	Pengelly Bridge	131677
11.6 cm	28 Jun 2012	Pengelly Bridge	131677
11.5 cm	28 Jun 2012	Pengelly Bridge	131677
11.3 cm	28 Jun 2012	Pengelly Bridge	131677
11.2 cm	28 Jun 1977	Pengelly	118266
11.1 cm	28 Jun 2012	Pengelly Bridge	131677
10.9 cm	28 Jun 2012	Pengelly Bridge	131677
10.8 cm	13 Sept 2011	Pengelly Bridge	127919
10.2 cm	28 Jun 2012	Pengelly Bridge	131677
9.9 cm	28 Jun 2012	Pengelly Bridge	131677

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
Pengelly Bridge	27 Jun 2006	9 Jul 2024	4
Carnglaze	27 Jun 2006	27 Jun 2006	1
Lampen	24 Oct 2002	24 Oct 2002	1
Pengelly	28 Jun 1977	9 Oct 1978	5

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

1977–2024

Survey records by year

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

177

478

079

080

081

082

083

084

085

086

087

088

089

090

091

092

093

094

095

096

097

098

099

000

001

102

003

004

005

206

007

008

009

010

111

112

013

014

015

016

017

018

019

020

021

022

023

124

Fish measured by surveyors

Measured length distribution

See how the 22 measured fish were spread across different length ranges.

Smallest: 3.8 cm
Lower quarter: 7.7 cm
Median: 9.1 cm
Upper quarter: 11.1 cm
Largest: 11.9 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River St Neot

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

Brown / sea trout European eel Atlantic salmon Bullhead 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 →