Brook lamprey · Lampetra planeri

Brook lamprey in the River Loddon

Largest measured brook lamprey: 18 cm

The largest brook lamprey measured in Environment Agency surveys of the River Loddon was 18 cm, recorded at Twyford RH Channel on 1 May 2007.

Across 19 measured brook lamprey, the median measured length was 14.3 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 Loddon.

See brook lamprey records across England →

Most recent observation25 October 2022Keepers Cottage

Largest measured brook lamprey: 18 cm
Median length: 14.3 cm
Fish measured: 19
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
18 cm	1 May 2007	Twyford RH Channel	105256
16.5 cm	17 Oct 2013	Lodge Farm	139601
16 cm	17 Oct 2013	Lodge Farm	139601
15.9 cm	17 Oct 2013	Lodge Farm	139601
15.2 cm	15 Oct 2015	Keepers Cottage	147159
15 cm	15 Oct 2015	Keepers Cottage	147159
15 cm	17 Oct 2013	Lodge Farm	139601
14.9 cm	15 Oct 2015	Keepers Cottage	147159
14.5 cm	17 Oct 2013	Lodge Farm	139601
14.3 cm	15 Oct 2015	Lodge Farm	147158

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
Keepers Cottage	23 Nov 2004	25 Oct 2022	4
Lodge Farm	11 Oct 2001	24 Oct 2022	14
Twyford LH Channel	15 Apr 2009	15 Apr 2009	1
Twyford RH Channel	1 May 2007	1 May 2007	1
Lilly Mill	11 Nov 2004	11 Nov 2004	1

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

2001–2022

Survey records by year

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

101

102

103

304

005

206

207

108

209

110

111

012

113

014

215

016

017

018

119

020

021

222

Fish measured by surveyors

Measured length distribution

See how the 19 measured fish were spread across different length ranges.

Smallest: 11 cm
Lower quarter: 13 cm
Median: 14.3 cm
Upper quarter: 15.1 cm
Largest: 18 cm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Loddon

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

Chub Gudgeon Brown / sea trout Pike Roach 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 →