Brook lamprey · Lampetra planeri

Brook lamprey in the River Stour

Largest measured brook lamprey: 19.7 cm

The largest brook lamprey measured in Environment Agency surveys of the River Stour was 19.7 cm, recorded at Higham Hall on 11 July 2017.

Across 20 measured brook lamprey, the median measured length was 16.9 cm.

Surveyors recorded weights for 15 brook lamprey. The median was 0.3 oz (0.009 kg) and the largest recorded weight was 1 oz (0.028 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Stour.

See brook lamprey records across England →

Most recent observation4 July 2023Bures Bridge A · 3 fish

Largest measured brook lamprey: 19.7 cm
Median length: 16.9 cm
Fish measured: 20
Survey locations: 5

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
19.7 cm	11 Jul 2017	Higham Hall	151215
18.6 cm	23 Aug 2022	Higham Hall	161850
18.6 cm	23 Aug 2022	Higham Hall	161850
17.9 cm	1 Oct 2022	Bures Bridge A	162085
17.6 cm	23 Aug 2022	Higham Hall	161850
17.6 cm	11 Jul 2017	Higham Hall	151215
17.5 cm	4 Jul 2023	Bures Bridge A	162720
17.5 cm	1 Oct 2022	Bures Bridge A	162085
17.2 cm	31 Oct 2021	Pitmire A	160776
17.1 cm	4 Jul 2023	Bures Bridge A	162720

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
Bures Bridge A	19 Jul 2017	4 Jul 2023	3
Pitmire A	31 Aug 2012	3 Sept 2022	3
Higham Hall	4 Jul 1985	23 Aug 2022	3
Bush Boake Allen	4 Sept 2012	4 Sept 2012	1
Langham Intake	26 Sept 1994	26 Sept 1994	1

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

1985–2023

Survey records by year

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

185

086

087

088

089

090

091

092

093

194

095

096

097

098

099

000

001

002

003

004

005

006

007

008

009

010

011

212

013

014

015

016

217

018

019

020

121

322

123

Fish measured by surveyors

Measured length distribution

See how the 20 measured fish were spread across different length ranges.

Smallest: 12.4 cm
Lower quarter: 15.4 cm
Median: 16.9 cm
Upper quarter: 17.6 cm
Largest: 19.7 cm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 15 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.005 kg)
Lower quarter: 0.2 oz (0.0055 kg)
Median: 0.3 oz (0.009 kg)
Upper quarter: 0.5 oz (0.013 kg)
Heaviest: 1 oz (0.028 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Stour

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

Roach European eel Perch Pike Chub Dace

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 →