RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the Cheriton stream

Largest measured brook lamprey: 15.5 cm

The largest brook lamprey measured in Environment Agency surveys of the Cheriton stream was 15.5 cm, recorded at Vernal Farm on 17 August 2010.

Across 25 measured brook lamprey, the median measured length was 12.6 cm.

Surveyors recorded weights for 2 brook lamprey. The median was 0.1 oz (0.004 kg) and the largest recorded weight was 0.1 oz (0.004 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Cheriton stream.

See brook lamprey records across England →

Most recent observation20 August 2025Vernal Farm · 9 fish
Largest measured brook lamprey
15.5 cm
Median length
12.6 cm
Fish measured
25
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 cm17 Aug 2010Vernal Farm123819
14.9 cm11 Aug 2011Cheriton stream 4: Cheriton Mill127379
14.5 cm17 Aug 2010Vernal Farm123819
14.5 cm17 Aug 2010Vernal Farm123819
14 cm17 Aug 2010Vernal Farm123819
14 cm9 Aug 2007Vernal Farm107898
13.5 cm17 Aug 2010Vernal Farm123819
13.5 cm9 Aug 2007Vernal Farm107898
13.1 cm9 Aug 2007Vernal Farm107898
13 cm31 Aug 2017Tichborne Park151415

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
Vernal Farm9 Aug 200720 Aug 202514
Cheriton stream 4: Cheriton Mill23 Sept 201019 Aug 202510
Tichborne Park31 Aug 201731 Aug 20171
Cheriton stream 2: Habitat Works9 Sept 200928 Sept 20152
Cheriton stream 1: downstream of flyover9 Sept 200928 Sept 20152
Upstream of Cheriton Mill23 Sept 201023 Sept 20101
Cheriton stream 3: Ironbridge14 Sept 200914 Sept 20091
Upstream of flyover2 Sept 20052 Sept 20051
Tichborne2 Sept 20052 Sept 20051

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

2005–2025

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 25 measured fish were spread across different length ranges.

Smallest
9.5 cm
Lower quarter
11.2 cm
Median
12.6 cm
Upper quarter
13.5 cm
Largest
15.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 2 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.004 kg)
Lower quarter
0.1 oz (0.004 kg)
Median
0.1 oz (0.004 kg)
Upper quarter
0.1 oz (0.004 kg)
Heaviest
0.1 oz (0.004 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the Cheriton stream

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

Brown / sea trout Bullhead 3-spined stickleback 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 →