RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the Little River Test

Largest measured brook lamprey: 12 cm

The largest brook lamprey measured in Environment Agency surveys of the Little River Test was 12 cm, recorded at u/s Navvy's Shovel, Nursling on 28 August 2019.

Across 29 measured brook lamprey, the median measured length was 7 cm.

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

See brook lamprey records across England →

Most recent observation13 August 2025Navvy's Shovel, Nursling · 2 fish
Largest measured brook lamprey
12 cm
Median length
7 cm
Fish measured
29
Survey locations
3

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
12 cm28 Aug 2019u/s Navvy's Shovel, Nursling155778
12 cm28 Aug 2019u/s Navvy's Shovel, Nursling155778
11 cm28 Aug 2019Drawing Room Pool155777
10.5 cm28 Aug 2019Drawing Room Pool155777
10.4 cm27 Aug 2024Navvy's Shovel, Nursling168153
9.5 cm27 Aug 2024Navvy's Shovel, Nursling168153
9.5 cm28 Aug 2019Drawing Room Pool155777
9 cm13 Aug 2025Navvy's Shovel, Nursling179214
8.5 cm13 Aug 2025Drawing Room Pool179210
8.5 cm28 Aug 2019Drawing Room Pool155777

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
Navvy's Shovel, Nursling23 Aug 202313 Aug 20253
Drawing Room Pool28 Aug 201913 Aug 20253
u/s Navvy's Shovel, Nursling28 Aug 201928 Aug 20191

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

2019–2025

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 29 measured fish were spread across different length ranges.

Smallest
1.9 cm
Lower quarter
5.3 cm
Median
7 cm
Upper quarter
9 cm
Largest
12 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Little River Test

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

European eel Bullhead Brown / sea trout

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 →