RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Bure (upper)

Largest measured brook lamprey: 18.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Bure (upper) was 18.5 cm, recorded at Full Mill Ford on 9 October 2006.

Across 303 measured brook lamprey, the median measured length was 12.1 cm.

Surveyors recorded weights for 137 brook lamprey. The median was 0.1 oz (0.0024 kg) and the largest recorded weight was 0.2 oz (0.0066 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Bure (upper).

See brook lamprey records across England →

Most recent observation17 October 2025Upstream Itteringham Bridge · 6 fish
Largest measured brook lamprey
18.5 cm
Median length
12.1 cm
Fish measured
303
Survey locations
8

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
18.5 cm9 Oct 2006Full Mill Ford106855
17.5 cm9 Oct 2006Full Mill Ford106855
16.5 cm9 Oct 2006Full Mill Ford106855
16.3 cm23 Apr 2010Saxthorpe Post Office Lane121447
16 cm1 Nov 2017Upstream Itteringham Bridge152405
15.8 cm12 May 2022Upstream Elmerdale Bridge161217
15.8 cm4 Oct 2018Saxthorpe Post Office Lane154257
15.8 cm8 May 2003Saxthorpe Post Office Lane75919
15.8 cm6 May 2003West End Plantation75918
15.7 cm12 May 2022Upstream Elmerdale Bridge161217

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
Upstream Itteringham Bridge26 Apr 198817 Oct 20259
Saxthorpe Post Office Lane8 May 20038 Sept 202511
Itteringham Common5 May 199412 May 20258
Park Farm18 Apr 19911 Jun 20223
Upstream Elmerdale Bridge25 Apr 198812 May 20226
Full Mill Ford9 Oct 20069 Oct 20061
West End Plantation6 May 20037 May 20042
Downstream Ingworth Bridge4 May 19944 May 19941

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

1988–2025

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 303 measured fish were spread across different length ranges.

Smallest
4.4 cm
Lower quarter
10.5 cm
Median
12.1 cm
Upper quarter
13.3 cm
Largest
18.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 137 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest
0 oz (0.0004 kg)
Lower quarter
0 oz (0.0013 kg)
Median
0.1 oz (0.0024 kg)
Upper quarter
0.1 oz (0.003 kg)
Heaviest
0.2 oz (0.0066 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Bure (upper)

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

Stone loach Brown / sea trout 3-spined stickleback Perch European eel Roach

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 →