RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Ecclesbourne

Largest measured brook lamprey: 20.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Ecclesbourne was 20.5 cm, recorded at Franker Brook on 31 July 2014.

Across 134 measured brook lamprey, the median measured length was 12.5 cm.

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

See brook lamprey records across England →

Most recent observation15 July 2025Franker Brook · 12 fish
Largest measured brook lamprey
20.5 cm
Median length
12.5 cm
Fish measured
134
Survey locations
5

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
20.5 cm31 Jul 2014Franker Brook144267
19.5 cm15 Aug 2012Windley Meadows132912
19 cm3 Sept 2021Windley Meadows160193
19 cm15 Aug 2012Windley Meadows132912
19 cm9 Aug 2011Shelbourne Brook127365
18.5 cm31 Jul 2014Franker Brook144267
18 cm3 Sept 2021Windley Meadows160193
18 cm14 Sept 2016Duffield149403
18 cm14 Sept 2016Duffield149403
18 cm31 Jul 2014Franker Brook144267

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
Franker Brook9 Aug 201115 Jul 20253
Jebbs Lane9 Aug 201110 Sept 20243
Windley Meadows15 Aug 20129 Sept 20243
Duffield22 Aug 20148 Sept 20234
Shelbourne Brook9 Aug 20119 Aug 20111

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

2011–2025

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 134 measured fish were spread across different length ranges.

Smallest
5 cm
Lower quarter
10.5 cm
Median
12.5 cm
Upper quarter
14.5 cm
Largest
20.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ecclesbourne

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

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

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 →