Brook lamprey · Lampetra planeri

Brook lamprey in the River Witham

Largest measured brook lamprey: 21.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Witham was 21.5 cm, recorded at Great Ponton on 7 September 2011.

Across 9 measured brook lamprey, the median measured length was 18.5 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 Witham.

See brook lamprey records across England →

Most recent observation2 September 2014Great Ponton

Largest measured brook lamprey: 21.5 cm
Median length: 18.5 cm
Fish measured: 9
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
21.5 cm	7 Sept 2011	Great Ponton	128806
20.5 cm	27 Sept 2010	Great Ponton	124308
19.2 cm	27 Sept 2010	Great Ponton	124308
18.7 cm	4 Sept 2013	Great Ponton	138524
18.5 cm	27 Sept 2010	Great Ponton	124308
15.5 cm	4 Sept 2013	Great Ponton	138524
14.1 cm	22 Sept 2010	Cringle Brook	124312
13.6 cm	27 Sept 2010	Great Ponton	124308
13.5 cm	4 Sept 2013	Cringle Brook	138541

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
Great Ponton	14 Mar 1994	2 Sept 2014	6
Cringle Brook	22 Sept 2010	4 Sept 2013	2

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

1994–2014

Survey records by year

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

194

095

096

097

098

099

000

001

002

003

004

005

006

007

108

009

210

111

012

213

114

Fish measured by surveyors

Measured length distribution

See how the 9 measured fish were spread across different length ranges.

Smallest: 13.5 cm
Lower quarter: 14.1 cm
Median: 18.5 cm
Upper quarter: 19.2 cm
Largest: 21.5 cm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Witham

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

Dace Roach Gudgeon European eel Perch Pike

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 →