RiverFish

River lamprey · Lampetra fluviatilis

River lamprey in the River Aln

Largest measured river lamprey: 21 cm

The largest river lamprey measured in Environment Agency surveys of the River Aln was 21 cm, recorded at Cawledge Burn site #2 on 4 July 2013.

Across 350 measured river lamprey, the median measured length was 12 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 Aln.

See river lamprey records across England →

Most recent observation11 July 2013Eglingham Burn at Shipley · 17 fish
Largest measured river lamprey
21 cm
Median length
12 cm
Fish measured
350
Survey locations
21

Individual EA measurements

Largest measured river lamprey

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
21 cm4 Jul 2013Cawledge Burn site #2136953
18.5 cm14 Sept 2012River Aln Upstream of Whittingham Ford133704
17 cm4 Jul 2013River Aln at Bridge of Aln136952
16.8 cm4 Jul 2013River Aln at Bridge of Aln136952
16.2 cm4 Jul 2013River Aln at Bridge of Aln136952
16 cm4 Jul 2013Cawledge Burn site #2136953
16 cm4 Jul 2013Cawledge Burn site #2136953
16 cm3 Sept 2012Titlington burn133732
16 cm3 Aug 2012Edlingham Burn at Lemmington132636
15.6 cm4 Jul 2013River Aln at Bridge of Aln136952

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where river lamprey were found

Each point marks a survey location with at least one river 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 river lamprey
Eglingham Burn at Shipley1 Aug 200911 Jul 20134
River Aln at Bridge of Aln16 Sept 19964 Jul 20132
Cawledge Burn site #24 Jul 20134 Jul 20131
Shawdon Burn13 Sept 20123 Jul 20132
River Aln at Bolton Mill27 Jul 20091 Jul 20133
Edlingham Burn at Battle Bridge7 Nov 20111 Jul 20133
River Aln at Abberwick Mill.18 Sept 201218 Sept 20121
Aln at Bridge End18 Sept 201218 Sept 20121
River Aln at Whittingham14 Sept 201214 Sept 20121
River Aln Upstream of Whittingham Ford14 Sept 201214 Sept 20121
Edlingham Burn13 Sept 201213 Sept 20121
Swine Burn, Thrunton Mill.4 Sept 20124 Sept 20121
Titlington burn3 Sept 20123 Sept 20121
Shipley burn at Aln Confluence6 Jul 20113 Sept 20122
Shipley Burn3 Sept 20123 Sept 20121
Coe Burn2 Sept 20122 Sept 20121
Callally Burn, callally mill2 Sept 20122 Sept 20121
Coe Burn caravan park1 Sept 20121 Sept 20121
River Aln at Abberwick Ford3 Aug 20123 Aug 20121
Glen aln Burn3 Aug 20123 Aug 20121
Edlingham Burn at Lemmington3 Aug 20123 Aug 20121

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

1996–2013

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 350 measured fish were spread across different length ranges.

Smallest
5.5 cm
Lower quarter
10.7 cm
Median
12 cm
Upper quarter
13 cm
Largest
21 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Aln

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

Brown / sea trout European eel Stone loach Atlantic salmon Minnow 3-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 →