RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Arun

Largest measured brook lamprey: 17.1 cm

The largest brook lamprey measured in Environment Agency surveys of the River Arun was 17.1 cm, recorded at Pulborough Cut on 15 September 2010.

Across 13 measured brook lamprey, the median measured length was 14 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 Arun.

See brook lamprey records across England →

Most recent observation9 July 2025Horsham Downstream Pack Horse Bridge · 1 fish
Largest measured brook lamprey
17.1 cm
Median length
14 cm
Fish measured
13
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.

LengthSurvey dateSurvey locationSurvey ID
17.1 cm15 Sept 2010Pulborough Cut125557
17 cm16 Sept 2009Pallingham120805
15.5 cm15 Sept 2010Pulborough Cut125557
14.5 cm12 Sept 2024Bignor Farm167161
14.5 cm16 Sept 2009Pallingham120805
14 cm15 Sept 2010Pulborough Cut125557
14 cm15 Sept 2010Pulborough Cut125557
13.8 cm15 Sept 2010Pulborough Cut125557
13.7 cm15 Sept 2010Pulborough Cut125557
13.6 cm8 Aug 2012Roman Station133171

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
Horsham Downstream Pack Horse Bridge9 Jul 20259 Jul 20251
Bignor Farm12 Sept 202412 Sept 20241
Pulborough Cut15 Sept 20105 Sept 20223
Roman Station8 Aug 20128 Aug 20121
Pallingham16 Sept 200916 Sept 20091

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

2009–2025

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 13 measured fish were spread across different length ranges.

Smallest
9.8 cm
Lower quarter
13.6 cm
Median
14 cm
Upper quarter
14.5 cm
Largest
17.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Arun

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

Roach Chub Gudgeon European eel Minnow Pike

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 →