Brook lamprey · Lampetra planeri

Brook lamprey in the River Tud

Largest measured brook lamprey: 19.7 cm

The largest brook lamprey measured in Environment Agency surveys of the River Tud was 19.7 cm, recorded at Berry Hall on 31 May 2018.

Across 155 measured brook lamprey, the median measured length was 13.3 cm.

Surveyors recorded weights for 45 brook lamprey. The median was 0.2 oz (0.0044 kg) and the largest recorded weight was 0.4 oz (0.01 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 Tud.

See brook lamprey records across England →

Most recent observation19 May 2025Berry Hall · 1 fish

Largest measured brook lamprey: 19.7 cm
Median length: 13.3 cm
Fish measured: 155
Survey locations: 7

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
19.7 cm	31 May 2018	Berry Hall	152753
19.1 cm	6 Jun 2019	Berry Hall	156002
17.9 cm	6 Jun 2019	Berry Hall	156002
17.8 cm	8 Jun 2015	Downstream A47 Honingham	145221
17.7 cm	31 May 2018	Berry Hall	152753
17.5 cm	13 Jun 2013	Berry Hall	136415
17.4 cm	5 Jul 2018	D\S Honingham Church	154104
17.2 cm	6 Jun 2019	Berry Hall	156002
17 cm	18 Jun 2018	Rogers Farm	153267
17 cm	11 Jun 2015	Rogers Farm	145320

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
Berry Hall	13 Jun 2013	19 May 2025	6
Upstream Hill Farm Bridge	7 Jun 2012	22 Apr 2024	3
D\S Honingham Church	1 Aug 1988	18 Apr 2024	7
Rogers Farm	30 Apr 1992	18 Jun 2018	5
Rotten Row	27 Apr 1992	4 Jun 2018	5
Costessey Gravel Works	9 Jun 2015	4 Jul 2017	2
Downstream A47 Honingham	15 Aug 1988	8 Jun 2015	6

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

1988–2025

Survey records by year

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

288

089

090

091

392

093

094

295

096

097

098

099

200

001

002

003

004

005

006

007

008

409

010

011

312

113

014

715

016

117

418

119

020

021

022

123

224

125

Fish measured by surveyors

Measured length distribution

See how the 155 measured fish were spread across different length ranges.

Smallest: 6.8 cm
Lower quarter: 11.9 cm
Median: 13.3 cm
Upper quarter: 14.7 cm
Largest: 19.7 cm

0–99 mm

100–199 mm

148

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 45 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.002 kg)
Lower quarter: 0.1 oz (0.003 kg)
Median: 0.2 oz (0.0044 kg)
Upper quarter: 0.2 oz (0.0059 kg)
Heaviest: 0.4 oz (0.01 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 Tud

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

Bullhead European eel Dace Stone loach Brown / sea trout Gudgeon

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 →