RiverFish

River lamprey · Lampetra fluviatilis

River lamprey in the River Leadon

Largest measured river lamprey: 25.8 cm

The largest river lamprey measured in Environment Agency surveys of the River Leadon was 25.8 cm, recorded at Payford Bridge on 23 September 2009.

Across 25 measured river lamprey, the median measured length was 15.6 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 Leadon.

See river lamprey records across England →

Most recent observation7 September 2012Ketford Bridge · 4 fish
Largest measured river lamprey
25.8 cm
Median length
15.6 cm
Fish measured
25
Survey locations
4

Individual EA measurements

Largest measured river lamprey

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
25.8 cm23 Sept 2009Payford Bridge119079
17.3 cm7 Sept 2012Ketford Bridge133438
17.1 cm24 Sept 2009Ketford Bridge119088
17 cm24 Sept 2009Ketford Bridge119088
16.8 cm24 Sept 2009Ketford Bridge119088
16.5 cm24 Sept 2009Ketford Bridge119088
16.5 cm24 Sept 2009Ketford Bridge119088
16.5 cm24 Sept 2009Greenway bridge, Donnington119084
16.3 cm7 Sept 2012Ketford Bridge133438
16.2 cm24 Sept 2009Ketford Bridge119088

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where river lamprey were found

Each point marks a survey location with at least one river 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 river lamprey
Ketford Bridge24 Sept 20097 Sept 20123
d/s Upleadon Bridge23 Sept 200913 Sept 20102
Greenway bridge, Donnington24 Sept 200924 Sept 20091
Payford Bridge23 Sept 200923 Sept 20091

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

2009–2012

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 25 measured fish were spread across different length ranges.

Smallest
9.5 cm
Lower quarter
13 cm
Median
15.6 cm
Upper quarter
16.5 cm
Largest
25.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Leadon

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

European eel Stone loach Minnow Brown / sea trout Bullhead 3-spined stickleback

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 →