RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Main Camel

Largest measured brook lamprey: 15.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Main Camel was 15.5 cm, recorded at Helstone Woods on 16 July 2019.

Across 73 measured brook lamprey, the median measured length was 10.8 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 Camel.

See brook lamprey records across England →

Most recent observation17 July 2025Gam · 1 fish
Largest measured brook lamprey
15.5 cm
Median length
10.8 cm
Fish measured
73
Survey locations
9

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
15.5 cm16 Jul 2019Helstone Woods155662
14.7 cm22 Jun 2010Gam122474
14.5 cm16 Jul 2019Helstone Woods155662
14 cm30 Jun 2023Gam162736
13.7 cm9 Jul 2025Helstone Woods179362
13.7 cm30 Jun 2010Helstone Woods122555
13.6 cm9 Jul 2025Helstone Woods179362
13.6 cm11 Jul 2017Grogley Halt151238
13.5 cm26 Jun 2023Helstone Woods162715
13.2 cm3 Sept 2015Helstone Woods146272

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
Gam24 Jul 200617 Jul 20256
u/s Kenningstock Weir15 Jun 202311 Jul 20253
Helstone Woods30 Jun 20109 Jul 20258
Downstream Pencarrow27 Jun 202427 Jun 20241
Tresarrett22 Aug 201330 Aug 20172
Wenford Bridge30 Jun 200618 Jul 20173
Grogley Halt1 Jun 200911 Jul 20172
Waterland20 Jun 201720 Jun 20171
Trecarne20 Jun 201720 Jun 20171

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 73 measured fish were spread across different length ranges.

Smallest
5.5 cm
Lower quarter
9.7 cm
Median
10.8 cm
Upper quarter
12.5 cm
Largest
15.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Camel

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

Bullhead Brown / sea trout Atlantic salmon European eel 3-spined stickleback Stone loach

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 →