RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Western Rother Tributaries

Largest measured brook lamprey: 15.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Western Rother Tributaries was 15.5 cm, recorded at Haslingbourne Brook, Strood Farm on 14 July 2026.

Across 57 measured brook lamprey, the median measured length was 12.5 cm.

Surveyors recorded weights for 12 brook lamprey. The median was 0.1 oz (0.004 kg) and the largest recorded weight was 0.2 oz (0.005 kg).

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

See brook lamprey records across England →

Most recent observation14 July 2026Haslingbourne Brook, Strood Farm · 5 fish
Largest measured brook lamprey
15.5 cm
Median length
12.5 cm
Fish measured
57
Survey locations
6

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 cm14 Jul 2026Haslingbourne Brook, Strood Farm182152
15 cm14 Jul 2026Haslingbourne Brook, Strood Farm182152
14.3 cm22 Aug 2014Sutton Stream conf142838
14.2 cm22 Aug 2014Sutton Stream conf142838
14.1 cm22 Aug 2014Sutton Stream conf142838
14 cm14 Jul 2026Haslingbourne Brook, Strood Farm182152
14 cm22 Aug 2014Sutton Stream conf142838
14 cm12 Jul 2013Burton millstream conf137157
14 cm11 Oct 2001Barnetts Brook22264
13.9 cm12 Oct 2001Haslingbourne Brook22663

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
Haslingbourne Brook, Strood Farm27 Jul 201214 Jul 20262
Haslingbourne Brook12 Oct 200118 Jul 20184
Sutton Stream conf12 Jul 201322 Aug 20142
Burton millstream conf12 Jul 201312 Jul 20131
Selham Stream8 Jul 20088 Jul 20081
Barnetts Brook11 Oct 200111 Oct 20011

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

2001–2026

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 57 measured fish were spread across different length ranges.

Smallest
7.5 cm
Lower quarter
11 cm
Median
12.5 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 12 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.003 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
0.2 oz (0.005 kg)

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

More fish in this river

Explore the River Western Rother Tributaries

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

Brown / sea trout Bullhead European eel Stone loach Minnow Perch

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 →