RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Main Wolf

Largest measured brook lamprey: 15.9 cm

The largest brook lamprey measured in Environment Agency surveys of the River Main Wolf was 15.9 cm, recorded at Germansweek on 30 July 2013.

Across 235 measured brook lamprey, the median measured length was 10.4 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 Main Wolf.

See brook lamprey records across England →

Most recent observation16 September 2025Wolf Confluence · 1 fish
Largest measured brook lamprey
15.9 cm
Median length
10.4 cm
Fish measured
235
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.

LengthSurvey dateSurvey locationSurvey ID
15.9 cm30 Jul 2013Germansweek137625
14 cm27 Jun 2012Wolf Confluence131679
13.9 cm2 Aug 2017Rexon151207
13.7 cm2 Aug 2017Rexon151207
13.5 cm19 Jun 2018Cookworthy Trap153051
13.5 cm2 Aug 2017Rexon151207
13.4 cm6 Aug 2015Wolf Confluence145800
13.1 cm6 Aug 2013Rexon138144
13 cm15 Sept 2022Wolf Confluence161670
13 cm1 Jul 2021Cookworthy Trap160597

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 surveyedFirst recordedLast recordedVisits finding brook lamprey
Wolf Confluence18 Sept 200816 Sept 202515
Rexon16 Jul 200916 Sept 202514
Cookworthy Trap14 Jul 201522 Jun 20237
d/s Roadford Dam25 Aug 201525 Aug 20151
Germansweek30 Jul 201330 Jul 20131

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

2008–2025

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 235 measured fish were spread across different length ranges.

Smallest
5.5 cm
Lower quarter
9.4 cm
Median
10.4 cm
Upper quarter
11.5 cm
Largest
15.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Wolf

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

Brown / sea trout Bullhead Minnow European eel Atlantic salmon 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 →