Brook lamprey · Lampetra planeri

Brook lamprey in the River Snail

Largest measured brook lamprey: 15.2 cm

The largest brook lamprey measured in Environment Agency surveys of the River Snail was 15.2 cm, recorded at Snailbridge House Fordham on 28 February 2014.

Across 68 measured brook lamprey, the median measured length was 12.1 cm.

Surveyors recorded weights for 68 brook lamprey. The median was 0.1 oz (0.003 kg) and the largest recorded weight was 0.2 oz (0.006 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 Snail.

See brook lamprey records across England →

Most recent observation14 March 2014Lynx Business Park · 11 fish

Largest measured brook lamprey: 15.2 cm
Median length: 12.1 cm
Fish measured: 68
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
15.2 cm	28 Feb 2014	Snailbridge House Fordham	140508
15.2 cm	28 Feb 2014	Snailbridge House Fordham	140508
15 cm	28 Feb 2014	Snailbridge House Fordham	140508
14.8 cm	28 Feb 2014	Snailbridge House Fordham	140508
14.5 cm	28 Feb 2014	Snailbridge House Fordham	140508
14.3 cm	28 Feb 2014	Snailbridge House Fordham	140508
13.8 cm	28 Feb 2014	Snailbridge House Fordham	140508
13.8 cm	28 Feb 2014	Snailbridge House Fordham	140508
13.7 cm	28 Feb 2014	Snailbridge House Fordham	140508
13.6 cm	28 Feb 2014	Snailbridge House Fordham	140508

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
Lynx Business Park	29 Jan 2008	14 Mar 2014	3
Snailbridge House Fordham	4 Mar 2013	28 Feb 2014	2
Snailwell Fen	29 Jan 2008	29 Jan 2008	1

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

2008–2014

Survey records by year

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

208

009

010

011

112

113

214

Fish measured by surveyors

Measured length distribution

See how the 68 measured fish were spread across different length ranges.

Smallest: 2.1 cm
Lower quarter: 10.6 cm
Median: 12.1 cm
Upper quarter: 13.1 cm
Largest: 15.2 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 68 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0.1 oz (0.002 kg)
Median: 0.1 oz (0.003 kg)
Upper quarter: 0.1 oz (0.004 kg)
Heaviest: 0.2 oz (0.006 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 Snail

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

3-spined stickleback Bullhead Pike Stone loach

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 →