Brook lamprey · Lampetra planeri

Brook lamprey in the River Etherow

Largest measured brook lamprey: 17.4 cm

The largest brook lamprey measured in Environment Agency surveys of the River Etherow was 17.4 cm, recorded at Etet05 on 13 April 2004.

Across 254 measured brook lamprey, the median measured length was 13 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 Etherow.

See brook lamprey records across England →

Most recent observation4 June 2025Et04 · 2 fish

Largest measured brook lamprey: 17.4 cm
Median length: 13 cm
Fish measured: 254
Survey locations: 5

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
17.4 cm	13 Apr 2004	Etet05	79580
17 cm	3 May 2006	Etet05	101478
17 cm	3 May 2006	Etet05	101478
16.5 cm	11 Aug 2023	Etet15	163539
16.3 cm	11 Aug 2023	Etet15	163539
16.2 cm	13 Apr 2004	Etet05	79580
16 cm	9 Aug 2023	Etet05	163538
16 cm	9 Aug 2023	Etet05	163538
16 cm	3 May 2006	Etet05	101478
16 cm	3 May 2006	Etet05	101478

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
Et04	21 May 2002	4 Jun 2025	6
Etet15	8 Apr 2003	11 Aug 2023	4
Etet05	7 Apr 2003	9 Aug 2023	4
Etet10	7 Apr 2003	3 May 2006	2
Et05	20 May 1999	20 May 1999	1

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

1999–2025

Survey records by year

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

199

000

001

202

303

204

105

406

007

008

109

010

011

012

013

014

015

016

017

018

019

020

021

022

223

024

125

Fish measured by surveyors

Measured length distribution

See how the 254 measured fish were spread across different length ranges.

Smallest: 2 cm
Lower quarter: 11 cm
Median: 13 cm
Upper quarter: 14 cm
Largest: 17.4 cm

0–99 mm

100–199 mm

218

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Etherow

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

Brown / sea trout Minnow Gudgeon Chub Roach 3-spined stickleback

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 →