RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Test

Largest measured brook lamprey: 16 cm

The largest brook lamprey measured in Environment Agency surveys of the River Test was 16 cm, recorded at Fullerton Old Beat on 25 September 2023.

Across 385 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 Test.

See brook lamprey records across England →

Most recent observation9 October 2025Kimbridge House · 3 fish
Largest measured brook lamprey
16 cm
Median length
10 cm
Fish measured
385
Survey locations
39

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.

LengthSurvey dateSurvey locationSurvey ID
16 cm25 Sept 2023Fullerton Old Beat164126
16 cm21 Sept 2020Grayling Island156403
16 cm7 Sept 2010Timsbury Mayfly carrier123787
16 cm7 Sept 2010Timsbury Mayfly carrier123787
14.8 cm19 Sept 2019Greatbridge Railway155425
14.7 cm19 Sept 2019Grayling Island155446
14.6 cm5 Sept 2018Romsey Canal153678
14.5 cm21 Sept 2020Greatbridge Railway156402
14.5 cm21 Sept 2020Greatbridge Railway156402
14.5 cm19 Sept 2019Greatbridge Railway155425

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 surveyedFirst recordedLast recordedVisits finding brook lamprey
Kimbridge House4 Sept 20189 Oct 20256
Freelands House, Wherwell6 Sept 20187 Oct 20256
Burnt Mill19 Sept 201916 Sept 20257
Mottisfont Bittern Shallow19 Sept 202415 Sept 20252
Linhay Meads Island Meadow15 Sept 202315 Sept 20253
Sheepbridge26 Jul 201812 Sept 20258
Moorcourt Main23 Jul 201812 Sept 20254
Longstock Mill18 Sept 201912 Sept 20256
Mainstone Farm31 Aug 201811 Sept 20259
Longbridge31 Aug 201811 Sept 20257
Mottisfont, Oakley Farm5 Sept 201810 Sept 20257
Horsebridge26 Jul 201810 Sept 20257
Bossington House beat6 Sept 201810 Sept 20257
Mayfly6 Sept 20189 Sept 20259
Romsey War Memorial Park15 Aug 202222 Aug 20252
Compton Carrier13 Sept 20029 Jul 20257
Romsey Canal18 Apr 201320 Sept 20245
Compton25 Jul 201817 Sept 20246
Bunnies17 Sept 201916 Sept 20243
Broadwater Point14 Sept 202316 Sept 20242
Kimbridge Mill Cottage5 Sept 201813 Sept 20247
Machine Shallows12 Sept 202412 Sept 20241
Meadowview20 Sept 202311 Sept 20242
Greatbridge Railway4 Sept 201811 Sept 20247
Grayling Island4 Sept 201811 Sept 20247
Fullerton Old Beat25 Sept 202325 Sept 20231
Pittleworth24 Jul 202019 Sept 20234
Nut Walk, Pittleworth24 Jul 202019 Sept 20235
Upper Houghton28 Sept 202028 Sept 20201
Upstream M2723 Jul 201823 Sept 20204
Moorcourt Carrier26 Sept 201926 Sept 20191
Kimbridge House 34 Sept 20184 Sept 20181
Romsey Canal Railway Bridge18 Apr 201318 Apr 20131
Dublin Farm17 Jul 201217 Jul 20121
Leckford Carrier12 Jul 201212 Jul 20121
Chilbolton Common12 Jul 201212 Jul 20121
Timsbury carrier restoration site18 Oct 201118 Oct 20111
Stockbridge, Marsh Court21 Sept 201021 Sept 20101
Timsbury Mayfly carrier7 Sept 20107 Sept 20101

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

2002–2025

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 385 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
7.5 cm
Median
10 cm
Upper quarter
12 cm
Largest
16 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Test

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

Brown / sea trout European eel Bullhead Minnow Stone loach Grayling

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 →