RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Brock

Largest measured brook lamprey: 17 cm

The largest brook lamprey measured in Environment Agency surveys of the River Brock was 17 cm, recorded at Myerscough College on 30 July 2010.

Across 111 measured brook lamprey, the median measured length was 11 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 Brock.

See brook lamprey records across England →

Most recent observation21 June 2023Myerscough College
Largest measured brook lamprey
17 cm
Median length
11 cm
Fish measured
111
Survey locations
2

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 cm30 Jul 2010Myerscough College123215
16 cm3 Aug 2016Myerscough College148769
16 cm20 Jun 2013Myerscough College136490
16 cm30 Jul 2010Myerscough College123215
15 cm3 Aug 2016Myerscough College148769
15 cm3 Aug 2016Myerscough College148769
15 cm30 Jul 2014Myerscough College142299
15 cm30 Jul 2014Myerscough College142299
15 cm20 Jun 2013Myerscough College136490
15 cm30 Jul 2010Myerscough College123215

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
Myerscough College20 Jul 200621 Jun 202315
Nearer Light Ash13 Sept 200613 Sept 20061

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

2006–2023

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 111 measured fish were spread across different length ranges.

Smallest
6.5 cm
Lower quarter
10 cm
Median
11 cm
Upper quarter
13 cm
Largest
17 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Brock

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

Brown / sea trout European eel Atlantic salmon Dace Chub Flounder

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 →