RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the Testwood & Nursling Fishery

Largest measured brook lamprey: 15.2 cm

The largest brook lamprey measured in Environment Agency surveys of the Testwood & Nursling Fishery was 15.2 cm, recorded at Wirehouse stream - North Arm on 15 October 2018.

Across 87 measured brook lamprey, the median measured length was 11.5 cm.

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

See brook lamprey records across England →

Most recent observation20 August 2025Testwood Pool - The Bay · 6 fish
Largest measured brook lamprey
15.2 cm
Median length
11.5 cm
Fish measured
87
Survey locations
7

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
15.2 cm15 Oct 2018Wirehouse stream - North Arm153862
15 cm15 Oct 2018Wirehouse stream - North Arm153862
14.4 cm21 Aug 2024Wirehouse stream - North Arm166396
13.8 cm15 Oct 2018Wirehouse stream - North Arm153862
13.8 cm15 Oct 2018Wirehouse stream - North Arm153862
13.7 cm15 Oct 2018Wirehouse stream - North Arm153862
13.6 cm15 Oct 2018Wirehouse stream - North Arm153862
13.5 cm15 Oct 2018Wirehouse stream - North Arm153862
13.5 cm15 Oct 2018Wirehouse stream - North Arm153862
13.2 cm15 Oct 2018Wirehouse stream - North Arm153862

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
Testwood Pool - The Bay20 Aug 202420 Aug 20252
Testwood Cattle Drink29 Aug 201912 Aug 20253
Wirehouse stream - North Arm15 Oct 201821 Aug 20243
Testwood fishing hut29 Aug 201920 Aug 20243
Nursling Mill30 Aug 201920 Aug 20243
Wirehouse stream - South Arm15 Oct 201823 Aug 20232
Ghillies Run, Testwood29 Aug 201923 Aug 20232

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

2018–2025

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 87 measured fish were spread across different length ranges.

Smallest
2.7 cm
Lower quarter
9 cm
Median
11.5 cm
Upper quarter
12.7 cm
Largest
15.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Testwood & Nursling Fishery

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

European eel Bullhead Atlantic salmon Flounder Chub 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 →