Brook lamprey · Lampetra planeri

Brook lamprey in the River Tat

Largest measured brook lamprey: 18.3 cm

The largest brook lamprey measured in Environment Agency surveys of the River Tat was 18.3 cm, recorded at Downstream Pynkney Hall, Tatterford on 11 March 2015.

Across 97 measured brook lamprey, the median measured length was 13.6 cm.

Surveyors recorded weights for 19 brook lamprey. The median was 0.2 oz (0.0047 kg) and the largest recorded weight was 0.3 oz (0.0087 kg).

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

See brook lamprey records across England →

Most recent observation16 February 2023Downstream Pynkney Hall, Tatterford · 5 fish

Largest measured brook lamprey: 18.3 cm
Median length: 13.6 cm
Fish measured: 97
Survey locations: 2

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
18.3 cm	11 Mar 2015	Downstream Pynkney Hall, Tatterford	144489
17.8 cm	11 Mar 2015	Downstream Pynkney Hall, Tatterford	144489
17.8 cm	11 Mar 2015	Downstream Pynkney Hall, Tatterford	144489
17.5 cm	11 Mar 2015	Downstream Pynkney Hall, Tatterford	144489
17.3 cm	11 Mar 2015	Downstream Pynkney Hall, Tatterford	144489
17 cm	9 Mar 2009	Coxford Abbey Farm	117065
16.5 cm	11 Mar 2015	Downstream Pynkney Hall, Tatterford	144489
16.3 cm	21 Mar 2013	Coxford Abbey Farm	135798
16 cm	11 Mar 2015	Downstream Pynkney Hall, Tatterford	144489
16 cm	26 Feb 2014	Coxford Abbey Farm	140502

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
Downstream Pynkney Hall, Tatterford	11 Mar 2015	16 Feb 2023	5
Coxford Abbey Farm	9 Mar 2009	11 Mar 2015	4

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

2009–2023

Survey records by year

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

109

010

011

012

113

114

215

116

017

118

019

020

021

122

123

Fish measured by surveyors

Measured length distribution

See how the 97 measured fish were spread across different length ranges.

Smallest: 7 cm
Lower quarter: 12.8 cm
Median: 13.6 cm
Upper quarter: 14.5 cm
Largest: 18.3 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 19 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.0023 kg)
Lower quarter: 0.1 oz (0.004 kg)
Median: 0.2 oz (0.0047 kg)
Upper quarter: 0.2 oz (0.0055 kg)
Heaviest: 0.3 oz (0.0087 kg)

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

More fish in this river

Explore the River Tat

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

Brown / sea trout 3-spined stickleback Bullhead Stone loach 10-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 →