Brook lamprey · Lampetra planeri

Brook lamprey in the River Chelmer

Largest measured brook lamprey: 20.8 cm

The largest brook lamprey measured in Environment Agency surveys of the River Chelmer was 20.8 cm, recorded at Camsix Farm A on 15 September 2016.

Across 44 measured brook lamprey, the median measured length was 18.3 cm.

Surveyors recorded weights for 44 brook lamprey. The median was 0.4 oz (0.0118 kg) and the largest recorded weight was 0.6 oz (0.0176 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 Chelmer.

See brook lamprey records across England →

Most recent observation15 September 2016Camsix Farm A · 40 fish

Largest measured brook lamprey: 20.8 cm
Median length: 18.3 cm
Fish measured: 44
Survey locations: 4

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
20.8 cm	15 Sept 2016	Camsix Farm A	149433
20.7 cm	15 Sept 2016	Camsix Farm A	149433
20.4 cm	15 Sept 2016	Camsix Farm A	149433
20.2 cm	15 Sept 2016	Camsix Farm A	149433
20.2 cm	15 Sept 2016	Camsix Farm A	149433
20.2 cm	15 Sept 2016	Camsix Farm A	149433
20 cm	15 Sept 2016	Camsix Farm A	149433
19.7 cm	15 Sept 2016	Camsix Farm A	149433
19.7 cm	15 Sept 2016	Camsix Farm A	149433
19.6 cm	15 Sept 2016	Camsix Farm A	149433

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
Camsix Farm A	26 Aug 2004	15 Sept 2016	2
Bowyers Bridge	21 Mar 2014	21 Mar 2014	1
Felstead A	18 Oct 1995	18 Aug 1998	2
Absol Bridge	17 Aug 1998	17 Aug 1998	1

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

1995–2016

Survey records by year

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

195

096

097

298

099

000

001

002

003

104

005

006

007

008

009

010

011

012

013

114

015

116

Fish measured by surveyors

Measured length distribution

See how the 44 measured fish were spread across different length ranges.

Smallest: 10.6 cm
Lower quarter: 17.2 cm
Median: 18.3 cm
Upper quarter: 19.5 cm
Largest: 20.8 cm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 44 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.002 kg)
Lower quarter: 0.3 oz (0.0097 kg)
Median: 0.4 oz (0.0118 kg)
Upper quarter: 0.5 oz (0.0142 kg)
Heaviest: 0.6 oz (0.0176 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 Chelmer

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

Chub Roach Pike Dace Gudgeon European eel

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 →