RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Main Lyd

Largest measured brook lamprey: 17.4 cm

The largest brook lamprey measured in Environment Agency surveys of the River Main Lyd was 17.4 cm, recorded at Lydford Gorge on 19 September 2017.

Across 593 measured brook lamprey, the median measured length was 11.5 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 Main Lyd.

See brook lamprey records across England →

Most recent observation8 September 2025Lifton Playing Field · 1 fish
Largest measured brook lamprey
17.4 cm
Median length
11.5 cm
Fish measured
593
Survey locations
10

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
17.4 cm19 Sept 2017Lydford Gorge151663
17 cm28 Aug 2019Lydford Gorge155572
16.5 cm28 Aug 2019Lydford Gorge155572
16.5 cm22 Sept 2016Lydford Gorge149629
16.4 cm19 Sept 2018Lydford Gorge153385
16.3 cm19 Sept 2018Lydford Gorge153385
16.3 cm19 Sept 2018Lydford Gorge153385
16.2 cm19 Sept 2018Lydford Gorge153385
16.1 cm19 Sept 2017Lydford Gorge151663
16 cm28 Aug 2019Lydford Gorge155572

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
Lifton Playing Field19 Jun 20098 Sept 20257
Lydford Gorge4 Jul 199522 Aug 202516
Greenlanes11 Aug 200911 Aug 202512
Spry Farm17 Aug 20116 Aug 20259
Sydenham7 Aug 200727 Jun 202517
u/s Gatherley19 Aug 200930 Jul 202411
Warren Wood21 Jul 202321 Jul 20231
Lifton Park19 Aug 200919 Aug 20213
Coryton Bridge22 Jul 20153 Aug 20212
Colemans Farm24 Sept 200824 Sept 20081

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

1995–2025

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 593 measured fish were spread across different length ranges.

Smallest
4.2 cm
Lower quarter
9.8 cm
Median
11.5 cm
Upper quarter
12.9 cm
Largest
17.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Lyd

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

Atlantic salmon Brown / sea trout Bullhead European eel Stone loach Minnow

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 →