RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Main West Looe

Largest measured brook lamprey: 14.2 cm

The largest brook lamprey measured in Environment Agency surveys of the River Main West Looe was 14.2 cm, recorded at Gillhill Wood on 23 July 2013.

Across 161 measured brook lamprey, the median measured length was 11.2 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 West Looe.

See brook lamprey records across England →

Most recent observation8 August 2025Gillhill Wood · 8 fish
Largest measured brook lamprey
14.2 cm
Median length
11.2 cm
Fish measured
161
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
14.2 cm23 Jul 2013Gillhill Wood137335
13.8 cm17 Aug 2009Gillhill Wood118521
13.6 cm11 Aug 2014Millcoombe Farm142170
13.6 cm23 Jul 2013Gillhill Wood137335
13.3 cm23 Jul 2014Sowdens Bridge141891
13.1 cm11 Aug 2014Millcoombe Farm142170
13.1 cm23 Jul 2014Sowdens Bridge141891
13 cm24 Jul 2012Gillhill Wood132613
12.9 cm2 Aug 2022Gillhill Wood161695
12.9 cm11 Aug 2014Millcoombe Farm142170

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
Gillhill Wood10 Jul 20068 Aug 202517
Millcoombe Farm28 Aug 200811 Aug 20142
Church Bridge16 Jul 20081 Aug 20142
Sowdens Bridge23 Jul 201423 Jul 20141
Scawn Mill23 Jul 201423 Jul 20141

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

2006–2025

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 161 measured fish were spread across different length ranges.

Smallest
4.5 cm
Lower quarter
10.1 cm
Median
11.2 cm
Upper quarter
12 cm
Largest
14.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main West Looe

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

Brown / sea trout Bullhead European eel Atlantic salmon

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 →