Brook lamprey · Lampetra planeri

Brook lamprey in the Main Tiddy Brook

Largest measured brook lamprey: 12.1 cm

The largest brook lamprey measured in Environment Agency surveys of the Main Tiddy Brook was 12.1 cm, recorded at Tilland on 7 August 2012.

Across 34 measured brook lamprey, the median measured length was 8.8 cm.

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

See brook lamprey records across England →

Most recent observation12 September 2024Heskyn Mill · 3 fish

Largest measured brook lamprey: 12.1 cm
Median length: 8.8 cm
Fish measured: 34
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.

Length	Survey date	Survey location	Survey ID
12.1 cm	7 Aug 2012	Tilland	132684
12 cm	7 Sept 2018	Tilland	153727
12 cm	7 Aug 2012	Tilland	132684
11.7 cm	7 Sept 2018	Tilland	153727
11.2 cm	7 Sept 2018	Tilland	153727
11 cm	7 Sept 2018	Tilland	153727
11 cm	7 Sept 2018	Tilland	153727
11 cm	22 Aug 2018	Heskyn Mill	153838
10.5 cm	7 Sept 2018	Tilland	153727
10.5 cm	7 Aug 2012	Tilland	132684

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
Heskyn Mill	22 Aug 2018	12 Sept 2024	2
Hepwell Bridge	19 Sept 2018	19 Sept 2018	1
Tilland	7 Aug 2012	7 Sept 2018	2
Cutkive Wood	30 Aug 2018	30 Aug 2018	1
Treweatha	22 Aug 2018	22 Aug 2018	1

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

2012–2024

Survey records by year

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

112

013

014

015

016

017

518

019

020

021

022

023

124

Fish measured by surveyors

Measured length distribution

See how the 34 measured fish were spread across different length ranges.

Smallest: 5 cm
Lower quarter: 7.7 cm
Median: 8.9 cm
Upper quarter: 10.5 cm
Largest: 12.1 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Main Tiddy Brook

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

Brown / sea trout Bullhead Atlantic salmon European eel

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 →