Brook lamprey · Lampetra planeri

Brook lamprey in the River Dee

Largest measured brook lamprey: 14 cm

The largest brook lamprey measured in Environment Agency surveys of the River Dee was 14 cm, recorded at Island, River Dee on 19 September 2019.

Across 8 measured brook lamprey, the median measured length was 10 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 Dee.

See brook lamprey records across England →

Most recent observation19 September 2019Island, River Dee · 5 fish

Largest measured brook lamprey: 14 cm
Median length: 10 cm
Fish measured: 8
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.

Length	Survey date	Survey location	Survey ID
14 cm	19 Sept 2019	Island, River Dee	155537
12 cm	19 Sept 2019	Island, River Dee	155537
11 cm	19 Sept 2019	Island, River Dee	155537
10 cm	19 Sept 2019	Island, River Dee	155537
10 cm	19 Sept 2019	Island, River Dee	155537
10 cm	10 Jul 2013	Island, River Dee	137464
10 cm	18 Aug 2010	Island, River Dee	123473
8 cm	18 Aug 2010	Island, River Dee	123473

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
Island, River Dee	12 Oct 2004	19 Sept 2019	4
Barth Bridge, River Dee	24 Aug 2007	24 Aug 2007	1

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

2004–2019

Survey records by year

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

104

005

006

107

008

009

110

011

012

113

014

015

016

017

018

119

Fish measured by surveyors

Measured length distribution

See how the 8 measured fish were spread across different length ranges.

Smallest: 8 cm
Lower quarter: 10 cm
Median: 10 cm
Upper quarter: 11.3 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 Dee

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

Brown / sea trout Atlantic salmon 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 →