Brook lamprey · Lampetra planeri

Brook lamprey in the River Rhee

Largest measured brook lamprey: 17 cm

The largest brook lamprey measured in Environment Agency surveys of the River Rhee was 17 cm, recorded at Malton Farm on 28 April 2010.

Across 5 measured brook lamprey, the median measured length was 16 cm.

Surveyors recorded weights for 4 brook lamprey. The median was 0.2 oz (0.0065 kg) and the largest recorded weight was 0.4 oz (0.01 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 Rhee.

See brook lamprey records across England →

Most recent observation24 July 2019Bury Holme Farm · 1 fish

Largest measured brook lamprey: 17 cm
Median length: 16 cm
Fish measured: 5
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
17 cm	28 Apr 2010	Malton Farm	121437
16.2 cm	29 Jul 2016	Bury Holme Farm	149045
16 cm	19 Nov 2003	Barrington to Harston Mill Investigation	78798
12.7 cm	24 Jul 2019	Bury Holme Farm	154986
12.7 cm	23 Aug 2013	Wendy	138110

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
Bury Holme Farm	29 Jul 2016	24 Jul 2019	2
Wendy	28 Oct 1993	23 Aug 2013	3
Malton Farm	28 Apr 2010	28 Apr 2010	1
Barrington to Harston Mill Investigation	19 Nov 2003	19 Nov 2003	1

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

1993–2019

Survey records by year

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

193

094

095

096

197

098

099

000

001

002

103

004

005

006

007

008

009

110

011

012

113

014

015

116

017

018

119

Fish measured by surveyors

Measured length distribution

See how the 5 measured fish were spread across different length ranges.

Smallest: 12.7 cm
Lower quarter: 12.7 cm
Median: 16 cm
Upper quarter: 16.2 cm
Largest: 17 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 4 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.0048 kg)
Lower quarter: 0.2 oz (0.005 kg)
Median: 0.2 oz (0.0065 kg)
Upper quarter: 0.3 oz (0.0085 kg)
Heaviest: 0.4 oz (0.01 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 Rhee

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

Roach Dace Bullhead Stone loach Gudgeon Pike

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 →