Brook lamprey · Lampetra planeri

Brook lamprey in the Gayton Brook

Largest measured brook lamprey: 20 cm

The largest brook lamprey measured in Environment Agency surveys of the Gayton Brook was 20 cm, recorded at Coton near Milwich on 22 October 2015.

Across 22 measured brook lamprey, the median measured length was 16.1 cm.

Surveyors recorded weights for 3 brook lamprey. The median was 0.2 oz (0.007 kg) and the largest recorded weight was 0.5 oz (0.014 kg).

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

See brook lamprey records across England →

Most recent observation7 June 2023Moat Farm, Gayton · 6 fish

Largest measured brook lamprey: 20 cm
Median length: 16.1 cm
Fish measured: 22
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
20 cm	22 Oct 2015	Coton near Milwich	147372
19.5 cm	21 Sept 2015	Moat Farm, Gayton	146781
19.4 cm	21 Sept 2015	Moat Farm, Gayton	146781
18.2 cm	7 Jun 2023	Moat Farm, Gayton	163933
18.2 cm	21 Sept 2015	Moat Farm, Gayton	146781
17.5 cm	7 Jun 2023	Moat Farm, Gayton	163933
17.5 cm	21 Sept 2015	Moat Farm, Gayton	146781
17 cm	21 Sept 2015	Moat Farm, Gayton	146781
16.7 cm	21 Sept 2015	Weston Weir	146782
16.3 cm	21 Sept 2015	Moat Farm, Gayton	146781

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
Moat Farm, Gayton	13 Jul 1999	7 Jun 2023	4
Coton near Milwich	22 Oct 2015	22 Oct 2015	1
Wetmore Farm	21 Sept 2015	21 Sept 2015	1
Weston Weir	21 Sept 2015	21 Sept 2015	1

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

1999–2023

Survey records by year

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

199

000

001

002

003

004

005

006

007

008

009

110

011

012

013

014

415

016

017

018

019

020

021

022

123

Fish measured by surveyors

Measured length distribution

See how the 22 measured fish were spread across different length ranges.

Smallest: 12.9 cm
Lower quarter: 15 cm
Median: 16.1 cm
Upper quarter: 17.5 cm
Largest: 20 cm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 3 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.004 kg)
Lower quarter: 0.2 oz (0.0055 kg)
Median: 0.2 oz (0.007 kg)
Upper quarter: 0.4 oz (0.0105 kg)
Heaviest: 0.5 oz (0.014 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the Gayton Brook

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

Bullhead Minnow Brown / sea trout Stone loach Grayling 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 →