Brook lamprey · Lampetra planeri

Brook lamprey in the River Glem

Largest measured brook lamprey: 18.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Glem was 18.5 cm, recorded at Lodge Farm Ford on 13 June 2006.

Across 7 measured brook lamprey, the median measured length was 17.5 cm.

Surveyors recorded weights for 7 brook lamprey. The median was 0.3 oz (0.0099 kg) and the largest recorded weight was 0.4 oz (0.012 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 Glem.

See brook lamprey records across England →

Most recent observation5 July 2012Martins Nest Bridge A · 4 fish

Largest measured brook lamprey: 18.5 cm
Median length: 17.5 cm
Fish measured: 7
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
18.5 cm	13 Jun 2006	Lodge Farm Ford	100060
18.3 cm	5 Jul 2012	Martins Nest Bridge A	132722
18.3 cm	5 Jul 2012	Martins Nest Bridge A	132722
17.5 cm	28 Jun 2012	Boxted Hall	132737
17.1 cm	5 Jul 2012	Martins Nest Bridge A	132722
17 cm	13 Jun 2006	Lodge Farm Ford	100060
15.5 cm	5 Jul 2012	Martins Nest Bridge A	132722

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
Martins Nest Bridge A	2 Apr 1985	5 Jul 2012	2
Boxted Hall	6 Mar 1985	28 Jun 2012	2
Lodge Farm Ford	27 May 1988	13 Jun 2006	2
Scotchford Bridge	1 Jun 1988	1 Jun 1988	1

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

1985–2012

Survey records by year

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

285

086

087

288

089

090

091

092

093

094

095

096

097

098

099

000

001

002

003

004

005

106

007

008

009

010

011

212

Fish measured by surveyors

Measured length distribution

See how the 7 measured fish were spread across different length ranges.

Smallest: 15.5 cm
Lower quarter: 17.1 cm
Median: 17.5 cm
Upper quarter: 18.3 cm
Largest: 18.5 cm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 7 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.0058 kg)
Lower quarter: 0.3 oz (0.0096 kg)
Median: 0.3 oz (0.0099 kg)
Upper quarter: 0.4 oz (0.0104 kg)
Heaviest: 0.4 oz (0.012 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 Glem

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

Dace Chub Roach European eel Bullhead Gudgeon

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 →