Brook lamprey · Lampetra planeri

Brook lamprey in the River Kennett

Largest measured brook lamprey: 13 cm

The largest brook lamprey measured in Environment Agency surveys of the River Kennett was 13 cm, recorded at Beck Bridge on 19 October 2005.

Across 27 measured brook lamprey, the median measured length was 10.1 cm.

Surveyors recorded weights for 22 brook lamprey. The median was 0.1 oz (0.002 kg) and the largest recorded weight was 0.3 oz (0.008 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 Kennett.

See brook lamprey records across England →

Most recent observation15 November 2018Freckenham · 2 fish

Largest measured brook lamprey: 13 cm
Median length: 10.1 cm
Fish measured: 27
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.

Length	Survey date	Survey location	Survey ID
13 cm	19 Oct 2005	Beck Bridge	88257
13 cm	19 Oct 2005	Freckenham	88253
12 cm	19 Oct 2005	Beck Bridge	88257
12 cm	19 Oct 2005	Freckenham	88253
12 cm	19 Oct 2005	Freckenham	88253
12 cm	19 Oct 2005	Freckenham	88253
11.5 cm	15 Nov 2018	Freckenham	154147
11.5 cm	18 Aug 2011	Freckenham	127470
11 cm	18 Aug 2011	Freckenham	127470
10.8 cm	18 Aug 2011	Freckenham	127470

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 surveyed	First recorded	Last recorded	Visits finding brook lamprey
Freckenham	19 Oct 2005	15 Nov 2018	5
Beck Bridge	19 Oct 2005	19 Oct 2005	1

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

2005–2018

Survey records by year

Each bar shows how many survey visits recorded brook lamprey that year.

205

006

007

008

009

010

111

112

013

014

115

016

017

118

Fish measured by surveyors

Measured length distribution

See how the 27 measured fish were spread across different length ranges.

Smallest: 7.6 cm
Lower quarter: 9.6 cm
Median: 10.1 cm
Upper quarter: 11.5 cm
Largest: 13 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 22 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.0012 kg)
Lower quarter: 0.1 oz (0.002 kg)
Median: 0.1 oz (0.002 kg)
Upper quarter: 0.1 oz (0.003 kg)
Heaviest: 0.3 oz (0.008 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 Kennett

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

3-spined stickleback Stone loach Bullhead Dace

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 →