Brook lamprey · Lampetra planeri

Brook lamprey in the River Quin

Largest measured brook lamprey: 18.1 cm

The largest brook lamprey measured in Environment Agency surveys of the River Quin was 18.1 cm, recorded at Upstream Griggs Bridge on 17 October 2017.

Across 40 measured brook lamprey, the median measured length was 14.5 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 Quin.

See brook lamprey records across England →

Most recent observation30 July 2026Upstream Griggs Bridge

Largest measured brook lamprey: 18.1 cm
Median length: 14.5 cm
Fish measured: 40
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	17 Oct 2017	Upstream Griggs Bridge	152022
18 cm	28 Oct 2021	Upstream Griggs Bridge	160893
17.6 cm	17 Oct 2017	Upstream Griggs Bridge	152022
17.3 cm	17 Oct 2017	Upstream Griggs Bridge	152022
16.9 cm	17 Oct 2017	Upstream Griggs Bridge	152022
16.2 cm	17 Oct 2017	Upstream Griggs Bridge	152022
16.1 cm	17 Oct 2017	Upstream Griggs Bridge	152022
16 cm	28 Oct 2021	Upstream Griggs Bridge	160893
16 cm	21 Oct 2008	Griggs Bridge	115575
15.5 cm	28 Oct 2021	Upstream Griggs Bridge	160893

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
Upstream Griggs Bridge	17 Oct 2017	30 Jul 2026	4
Quinbury Farm	19 Sept 2013	14 Oct 2019	2
Griggs Bridge	21 Oct 2008	21 Oct 2008	1

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

2008–2026

Survey records by year

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

108

009

010

011

012

113

014

015

016

117

018

119

020

121

022

023

024

125

126

Fish measured by surveyors

Measured length distribution

See how the 40 measured fish were spread across different length ranges.

Smallest: 8.5 cm
Lower quarter: 13 cm
Median: 14.5 cm
Upper quarter: 15.5 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 Quin

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

Brown / sea trout Bullhead 3-spined stickleback

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 →