RiverFish

River lamprey · Lampetra fluviatilis

River lamprey in the River Wansbeck

Largest measured river lamprey: 19.5 cm

The largest river lamprey measured in Environment Agency surveys of the River Wansbeck was 19.5 cm, recorded at River Wansbeck at Bothel Castle Stepping Stones on 2 August 2009.

Across 43 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 Wansbeck.

See river lamprey records across England →

Most recent observation24 July 2013River Wansbeck at Bothel Castle Stepping Stones · 2 fish
Largest measured river lamprey
19.5 cm
Median length
12 cm
Fish measured
43
Survey locations
7

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
19.5 cm2 Aug 2009River Wansbeck at Bothel Castle Stepping Stones121087
17 cm22 Jul 2013River Wansbeck at Mill Farm137283
17 cm2 Aug 2009River Wansbeck at River Green Mill121084
16 cm22 Jul 2013River Wansbeck at Mill Farm137283
15.1 cm23 Jul 2013River Wansbeck at Stobbs Farm137324
15 cm22 Jul 2013River Wansbeck at Mill Farm137283
14.9 cm24 Jul 2013River Wansbeck at Bothel Castle Stepping Stones137363
14.4 cm23 Jul 2013River Wansbeck at Stobbs Farm137324
14.1 cm23 Jul 2013River Wansbeck at Stobbs Farm137324
14 cm22 Jul 2013River Wansbeck at Mill Farm137283

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
River Wansbeck at Bothel Castle Stepping Stones2 Aug 200924 Jul 20132
River Wansbeck at Stobbs Farm23 Jul 201323 Jul 20131
River Wansbeck at Mill Farm22 Jul 201322 Jul 20131
Hart burn at Hartington1 Jul 20111 Jul 20111
River Wansbeck at Middleton Mill29 Jun 201129 Jun 20111
River Wansbeck at Dean House29 Jun 201129 Jun 20111
River Wansbeck at River Green Mill2 Aug 20092 Aug 20091

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

2009–2013

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 43 measured fish were spread across different length ranges.

Smallest
6.5 cm
Lower quarter
9.8 cm
Median
12 cm
Upper quarter
14 cm
Largest
19.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Wansbeck

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

Stone loach Brown / sea trout Minnow European eel Bullhead 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 →