Brook lamprey · Lampetra planeri

Brook lamprey in the River Dikler

Largest measured brook lamprey: 13.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Dikler was 13.5 cm, recorded at River Dickler - Bourton on the Water on 24 September 2009.

Across 2 measured brook lamprey, the median measured length was 13 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 Dikler.

See brook lamprey records across England →

Most recent observation10 June 2021River Dikler at Lower Swell

Largest measured brook lamprey: 13.5 cm
Median length: 13 cm
Fish measured: 2
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
13.5 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895
12.5 cm	24 Sept 2009	River Dickler - Bourton on the Water	119895

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
River Dikler at Lower Swell	26 Sept 2002	10 Jun 2021	7
River Dickler - Bourton on the Water	24 Sept 2009	24 Sept 2009	1

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

2002–2021

Survey records by year

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

102

103

204

205

006

007

008

109

010

011

012

013

014

015

016

017

018

019

020

121

Fish measured by surveyors

Measured length distribution

See how the 2 measured fish were spread across different length ranges.

Smallest: 12.5 cm
Lower quarter: 12.8 cm
Median: 13 cm
Upper quarter: 13.3 cm
Largest: 13.5 cm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Dikler

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

Brown / sea trout Bullhead European eel 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 →