Brook lamprey · Lampetra planeri

Brook lamprey in the River Main Fal

Largest measured brook lamprey: 12.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Main Fal was 12.5 cm, recorded at Retew on 26 August 2001.

Across 57 measured brook lamprey, the median measured length was 10.5 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 Fal.

See brook lamprey records across England →

Most recent observation16 August 2011Trenowth · 13 fish

Largest measured brook lamprey: 12.5 cm
Median length: 10.5 cm
Fish measured: 57
Survey locations: 6

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
12.5 cm	26 Aug 2001	Retew	126665
12.3 cm	26 Aug 2001	Retew	126665
12.1 cm	26 Aug 2001	Retew	126665
12 cm	5 Aug 2011	Meledor	127289
12 cm	2 Aug 2011	Gaverigan	127485
11.8 cm	2 Aug 2011	Gaverigan	127485
11.7 cm	2 Aug 2011	Gaverigan	127485
11.6 cm	2 Aug 2011	Gaverigan	127485
11.6 cm	2 Aug 2011	Gaverigan	127485
11.6 cm	2 Aug 2011	Gaverigan	127485

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
Trenowth	11 Jun 2009	16 Aug 2011	2
Trelasker	5 Aug 2011	5 Aug 2011	1
Meledor	5 Aug 2011	5 Aug 2011	1
Golden Mill	2 Aug 2011	2 Aug 2011	1
Gaverigan	1 Jun 1992	2 Aug 2011	2
Retew	2 Jun 1992	26 Aug 2001	4

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

1992–2011

Survey records by year

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

292

093

094

195

096

097

198

099

000

101

002

003

004

005

006

007

008

109

010

511

Fish measured by surveyors

Measured length distribution

See how the 57 measured fish were spread across different length ranges.

Smallest: 6.5 cm
Lower quarter: 8.7 cm
Median: 10.5 cm
Upper quarter: 11.5 cm
Largest: 12.5 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Fal

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

Brown / sea trout European eel Atlantic salmon Bullhead Minnow

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 →