Brook lamprey · Lampetra planeri

Brook lamprey in the River Derwent

Largest measured brook lamprey: 19.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Derwent was 19.5 cm, recorded at Hathersage on 25 August 2011.

Across 64 measured brook lamprey, the median measured length was 15.1 cm.

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

See brook lamprey records across England →

Most recent observation13 September 2018Hathersage · 3 fish

Largest measured brook lamprey: 19.5 cm
Median length: 15.1 cm
Fish measured: 64
Survey locations: 10

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
19.5 cm	25 Aug 2011	Hathersage	127624
19 cm	19 Aug 2014	Hathersage	144237
19 cm	3 Jul 2013	Hathersage	139763
18.8 cm	19 Aug 2014	Hathersage	144237
18 cm	17 Sept 2014	Nooning Lane	142947
18 cm	3 Jul 2013	Hathersage	139763
18 cm	3 Jul 2013	Hathersage	139763
17.5 cm	17 Sept 2014	Chub Alley	142862
17.3 cm	19 Aug 2014	Hathersage	144237
17 cm	17 Sept 2014	Nooning Lane	142947

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
Hathersage	29 Jan 1998	13 Sept 2018	9
Cromford Salmon Parr	3 Oct 2016	3 Oct 2016	1
Borrowash Fish Pass Pool1	25 Feb 2016	16 Sept 2016	2
Borrowash Fish Pass Pool 2	26 Feb 2016	26 Feb 2016	1
Raynesway Weir Pool	25 Sept 2015	25 Sept 2015	1
Borrowash Black Weir	25 Sept 2015	25 Sept 2015	1
Nooning Lane	17 Sept 2014	17 Sept 2014	1
Chub Alley	17 Sept 2014	17 Sept 2014	1
Ambergate	5 May 1993	5 May 1993	1
Matlock Bath	29 Apr 1993	29 Apr 1993	1

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

1993–2018

Survey records by year

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

293

094

095

096

097

198

099

000

001

002

003

004

005

006

107

108

109

010

111

112

113

314

215

416

017

118

Fish measured by surveyors

Measured length distribution

See how the 64 measured fish were spread across different length ranges.

Smallest: 6.8 cm
Lower quarter: 12.4 cm
Median: 15.1 cm
Upper quarter: 16.5 cm
Largest: 19.5 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent

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

Brown / sea trout Bullhead Minnow Grayling Chub 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 →