Brook lamprey · Lampetra planeri

Brook lamprey in the River Sow

Largest measured brook lamprey: 15.6 cm

The largest brook lamprey measured in Environment Agency surveys of the River Sow was 15.6 cm, recorded at Byanna Farm, Eccleshall on 25 April 2013.

Across 40 measured brook lamprey, the median measured length was 13.2 cm.

Surveyors recorded weights for 11 brook lamprey. The median was 0.2 oz (0.006 kg) and the largest recorded weight was 0.3 oz (0.0095 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 Sow.

See brook lamprey records across England →

Most recent observation4 June 2015Byanna Farm, Eccleshall · 30 fish

Largest measured brook lamprey: 15.6 cm
Median length: 13.2 cm
Fish measured: 40
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
15.6 cm	25 Apr 2013	Byanna Farm, Eccleshall	136053
15.2 cm	4 Jun 2015	Byanna Farm, Eccleshall	144876
15.1 cm	4 Jun 2015	Byanna Farm, Eccleshall	144876
15 cm	4 Jun 2015	Byanna Farm, Eccleshall	144876
14.8 cm	4 Jun 2015	Byanna Farm, Eccleshall	144876
14.8 cm	4 Jun 2015	Byanna Farm, Eccleshall	144876
14.7 cm	4 Jun 2015	Byanna Farm, Eccleshall	144876
14.7 cm	4 Jun 2015	Byanna Farm, Eccleshall	144876
14.3 cm	25 Apr 2013	Byanna Farm, Eccleshall	136053
14.2 cm	4 Jun 2015	Byanna Farm, Eccleshall	144876

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
Byanna Farm, Eccleshall	23 Mar 2004	4 Jun 2015	5
Sainsbury's, Stafford	15 Apr 2004	15 Apr 2004	1

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

2004–2015

Survey records by year

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

204

105

106

007

008

009

010

011

012

113

014

115

Fish measured by surveyors

Measured length distribution

See how the 40 measured fish were spread across different length ranges.

Smallest: 9.7 cm
Lower quarter: 12.4 cm
Median: 13.3 cm
Upper quarter: 14.2 cm
Largest: 15.6 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 11 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.0045 kg)
Lower quarter: 0.2 oz (0.0055 kg)
Median: 0.2 oz (0.006 kg)
Upper quarter: 0.2 oz (0.007 kg)
Heaviest: 0.3 oz (0.0095 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 Sow

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

Perch Chub Pike Gudgeon Bullhead Roach

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 →