Brook lamprey · Lampetra planeri

Brook lamprey in the UCL surveys

Largest measured brook lamprey: 16.8 cm

The largest brook lamprey measured in Environment Agency surveys of the UCL surveys was 16.8 cm, recorded at Shaded 2 on 15 June 2008.

Across 8 measured brook lamprey, the median measured length was 12.6 cm.

Surveyors recorded weights for 8 brook lamprey. The median was 0.1 oz (0.004 kg) and the largest recorded weight was 0.3 oz (0.009 kg).

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

See brook lamprey records across England →

Most recent observation16 June 2008Shaded 3 · 1 fish

Largest measured brook lamprey: 16.8 cm
Median length: 12.6 cm
Fish measured: 8
Survey locations: 3

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
16.8 cm	15 Jun 2008	Shaded 2	111898
16 cm	13 Jun 2008	Open 3	111896
15.8 cm	13 Jun 2008	Open 3	111896
12.6 cm	13 Jun 2008	Open 3	111896
12.5 cm	13 Jun 2008	Open 3	111896
11.4 cm	16 Jun 2008	Shaded 3	111899
2.5 cm	13 Jun 2008	Open 3	111896
1.4 cm	13 Jun 2008	Open 3	111896

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
Shaded 3	16 Jun 2008	16 Jun 2008	1
Shaded 2	15 Jun 2008	15 Jun 2008	1
Open 3	13 Jun 2008	13 Jun 2008	1

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

2008–2008

Survey records by year

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

308

Fish measured by surveyors

Measured length distribution

See how the 8 measured fish were spread across different length ranges.

Smallest: 1.4 cm
Lower quarter: 9.2 cm
Median: 12.6 cm
Upper quarter: 15.9 cm
Largest: 16.8 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 8 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.0023 kg)
Lower quarter: 0.1 oz (0.0029 kg)
Median: 0.1 oz (0.004 kg)
Upper quarter: 0.3 oz (0.0079 kg)
Heaviest: 0.3 oz (0.009 kg)

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

More fish in this river

Explore the UCL surveys

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

Brown / sea trout Bullhead

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 →