RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Meon

Largest measured brook lamprey: 15.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Meon was 15.5 cm, recorded at Mislingford Beat on 2 August 2011.

Across 11 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 Meon.

See brook lamprey records across England →

Most recent observation5 August 2025Mislingford Beat · 1 fish
Largest measured brook lamprey
15.5 cm
Median length
13 cm
Fish measured
11
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 cm2 Aug 2011Mislingford Beat127235
14.2 cm8 Aug 2007Upstream of Silver Springs107942
13.5 cm27 Jul 2010Upstream of Silver Springs123885
13.1 cm2 Aug 2011Mislingford Beat127235
13 cm26 Jul 2011Exton127232
13 cm19 Jul 2011Holywell127117
12 cm2 Aug 2011Mislingford Beat127235
11.2 cm2 Aug 2011Upstream of Silver Springs127234
10.5 cm14 Jul 2011Moorhen trout fishery127115
10.5 cm27 Jul 2010Upstream of Silver Springs123885

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
Upstream of Silver Springs8 Aug 20075 Aug 20259
Mislingford Beat10 Aug 20095 Aug 202511
Upper Rookesbury3 Aug 20233 Aug 20231
Wickham gardens31 Jul 202331 Jul 20231
Holywell19 Jul 201131 Jul 20232
Titchfield Mill old river24 Jul 201727 Jul 20232
Exton26 Jul 201110 Aug 20172
Moorhen trout fishery14 Jul 201128 Jul 20172
Titchfield Canal24 Jul 201724 Jul 20171

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

2007–2025

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 11 measured fish were spread across different length ranges.

Smallest
9 cm
Lower quarter
10.9 cm
Median
13 cm
Upper quarter
13.3 cm
Largest
15.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Meon

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

Brown / sea trout European eel Bullhead Minnow Chub 3-spined stickleback

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 →