RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Welland

Largest measured brook lamprey: 19.3 cm

The largest brook lamprey measured in Environment Agency surveys of the River Welland was 19.3 cm, recorded at Sandy Lane on 10 October 2024.

Across 7 measured brook lamprey, the median measured length was 16.1 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 Welland.

See brook lamprey records across England →

Most recent observation16 October 2024Hudds Mill Downstream Weir (main channel) · 3 fish
Largest measured brook lamprey
19.3 cm
Median length
16.1 cm
Fish measured
7
Survey locations
4

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
19.3 cm10 Oct 2024Sandy Lane167570
17.2 cm10 Oct 2024Sandy Lane167570
16.3 cm16 Oct 2024Hudds Mill Downstream Weir (main channel)167660
16.1 cm16 Oct 2024Hudds Mill Downstream Weir (main channel)167660
16.1 cm10 Oct 2024Sandy Lane167570
13.8 cm16 Oct 2024Hudds Mill Downstream Weir (main channel)167660
13.5 cm1 Jul 2014Downstream Tinwell weir141931

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
Hudds Mill Downstream Weir (main channel)16 Oct 202416 Oct 20241
Sandy Lane10 Oct 202410 Oct 20241
Downstream Tinwell weir2 Sept 20091 Jul 20142
Stamford Meadows11 May 200613 May 20083

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

2006–2024

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
13.5 cm
Lower quarter
15 cm
Median
16.1 cm
Upper quarter
16.8 cm
Largest
19.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Welland

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

Pike Dace European eel Roach Perch Gudgeon

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 →