RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Keer

Largest measured brook lamprey: 16 cm

The largest brook lamprey measured in Environment Agency surveys of the River Keer was 16 cm, recorded at Cinder Hill Farm on 16 August 2010.

Across 33 measured brook lamprey, the median measured length was 13 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 Keer.

See brook lamprey records across England →

Most recent observation17 June 2024Downstream Keer West Bridge · 4 fish
Largest measured brook lamprey
16 cm
Median length
13 cm
Fish measured
33
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
16 cm16 Aug 2010Cinder Hill Farm123469
15 cm8 Jul 2016Cinder Hill Farm148575
14.4 cm16 Aug 2010Cinder Hill Farm123469
14 cm8 Jul 2016Cinder Hill Farm148575
14 cm16 Jun 2016Pack Horse Bridge Upstream Railway Viaduct148251
13 cm17 Jun 2024Downstream Keer West Bridge165150
13 cm15 Aug 2018Downstream Keer West Bridge153066
13 cm15 Aug 2018Downstream Keer West Bridge153066
13 cm20 Jul 2017Downstream Keer West Bridge151109
13 cm8 Jul 2016Cinder Hill Farm148575

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
Downstream Keer West Bridge3 Jul 201317 Jun 20247
High Keer Bridge at Kellet Lane8 Aug 201122 Jun 20236
Cinder Hill Farm16 Aug 201026 Jul 20223
Borwick Lodge25 Jul 202225 Jul 20221
Pack Horse Bridge Upstream Railway Viaduct11 Aug 201016 Jun 20162

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

2010–2024

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 33 measured fish were spread across different length ranges.

Smallest
9 cm
Lower quarter
11 cm
Median
13 cm
Upper quarter
13 cm
Largest
16 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Keer

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

Brown / sea trout European eel Atlantic salmon River lamprey

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 →