RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Wey South

Largest measured brook lamprey: 17 cm

The largest brook lamprey measured in Environment Agency surveys of the River Wey South was 17 cm, recorded at Dockenfield on 28 June 2023.

Across 7 measured brook lamprey, the median measured length was 11 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 Wey South.

See brook lamprey records across England →

Most recent observation23 October 2024Hatch Farm · 1 fish
Largest measured brook lamprey
17 cm
Median length
11 cm
Fish measured
7
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
17 cm28 Jun 2023Dockenfield162616
16 cm28 Jun 2023Dockenfield162616
12 cm28 Jun 2023Dockenfield162616
11 cm23 Oct 2024Hatch Farm168011
11 cm28 Jun 2023Dockenfield162616
10.5 cm28 Jun 2023Dockenfield162616
10 cm28 Jun 2023Dockenfield162616

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
Hatch Farm26 Oct 199923 Oct 20247
Dockenfield22 May 200328 Jun 20239
Lower Headley Wood Farm6 Apr 20046 Apr 20041

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

1999–2024

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 7 measured fish were spread across different length ranges.

Smallest
10 cm
Lower quarter
10.8 cm
Median
11 cm
Upper quarter
14 cm
Largest
17 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Wey South

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

Brown / sea trout Bullhead Stone loach European eel Rainbow trout 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 →