RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Main Ottery

Largest measured brook lamprey: 16.2 cm

The largest brook lamprey measured in Environment Agency surveys of the River Main Ottery was 16.2 cm, recorded at Downstream Trengune Br on 4 July 2013.

Across 134 measured brook lamprey, the median measured length was 11 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 Ottery.

See brook lamprey records across England →

Most recent observation8 July 2026Penrose · 9 fish
Largest measured brook lamprey
16.2 cm
Median length
11 cm
Fish measured
134
Survey locations
9

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.

LengthSurvey dateSurvey locationSurvey ID
16.2 cm4 Jul 2013Downstream Trengune Br136999
15 cm8 Jul 2026Penrose182138
14.5 cm24 May 2022Otterham Mill160985
14.3 cm13 Jul 2021Otterham Mill160698
14 cm24 May 2022Otterham Mill160985
14 cm1 Jul 2015High Wires145256
14 cm20 Aug 2013Yeolm Bridge138043
14 cm16 Jun 2009High Wires117409
13.7 cm24 May 2022Otterham Mill160985
13.5 cm16 Jun 2021High Wires160695

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 surveyedFirst recordedLast recordedVisits finding brook lamprey
Penrose7 Jul 20158 Jul 20265
Downstream Trengune Br8 Aug 200828 Jul 202512
High Wires16 Jun 200916 Aug 20234
Otterham Mill30 Jun 200924 May 20224
Hellescott10 Jul 201520 Jul 20212
Downstream Yeolm Bridge10 Sept 201510 Sept 20151
Yeolm Bridge7 Jul 201020 Aug 20133
Penheale11 Aug 200630 Jun 20115
Trengune17 Jul 200617 Jul 20061

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

2006–2026

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 134 measured fish were spread across different length ranges.

Smallest
6 cm
Lower quarter
9.5 cm
Median
11 cm
Upper quarter
12.5 cm
Largest
16.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Ottery

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

Atlantic salmon Brown / sea trout Bullhead Stone loach Minnow 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 →