RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River US Wissey

Largest measured brook lamprey: 12.8 cm

The largest brook lamprey measured in Environment Agency surveys of the River US Wissey was 12.8 cm, recorded at Hilborough Mill on 12 April 2012.

Across 6 measured brook lamprey, the median measured length was 11.8 cm.

Surveyors recorded weights for 5 brook lamprey. The median was 0.2 oz (0.005 kg) and the largest recorded weight was 0.5 oz (0.015 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 US Wissey.

See brook lamprey records across England →

Most recent observation18 April 2024Hilborough Ford · 1 fish
Largest measured brook lamprey
12.8 cm
Median length
11.8 cm
Fish measured
6
Survey locations
3

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
12.8 cm12 Apr 2012Hilborough Mill131043
12.7 cm23 Apr 2012Watermill Farm131118
12.1 cm1 Jun 2015Hilborough Ford144818
11.5 cm18 Apr 2024Hilborough Ford164710
11.3 cm23 Apr 2012Watermill Farm131118
9.7 cm1 Jun 2015Hilborough Ford144818

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
Hilborough Ford24 Feb 200018 Apr 20243
Watermill Farm23 Apr 201223 Apr 20121
Hilborough Mill12 Apr 201212 Apr 20121

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

2000–2024

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 6 measured fish were spread across different length ranges.

Smallest
9.7 cm
Lower quarter
11.4 cm
Median
11.8 cm
Upper quarter
12.6 cm
Largest
12.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 5 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.003 kg)
Lower quarter
0.2 oz (0.005 kg)
Median
0.2 oz (0.005 kg)
Upper quarter
0.4 oz (0.01 kg)
Heaviest
0.5 oz (0.015 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 US Wissey

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

Bullhead Brown / sea trout Dace Gudgeon Stone loach 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 →