RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Wensum (Barbel)

Largest measured brook lamprey: 15.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Wensum (Barbel) was 15.5 cm, recorded at Lenwade Bridge on 19 August 2010.

Across 16 measured brook lamprey, the median measured length was 11.9 cm.

Surveyors recorded weights for 2 brook lamprey. The median was 0.2 oz (0.0048 kg) and the largest recorded weight was 0.2 oz (0.0054 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 Wensum (Barbel).

See brook lamprey records across England →

Most recent observation24 September 2013Downstream Costessey point (all species) · 6 fish
Largest measured brook lamprey
15.5 cm
Median length
11.9 cm
Fish measured
16
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
15.5 cm19 Aug 2010Lenwade Bridge123955
14.3 cm20 Sept 2013Downstream Taverham Mill (All species)139322
13.9 cm24 Sept 2013Downstream Costessey point (all species)139347
13.8 cm24 Sept 2013Downstream Costessey point (all species)139347
13.2 cm24 Sept 2013Downstream Costessey point (all species)139347
13.2 cm19 Aug 2010Lenwade Bridge123955
12.2 cm20 Sept 2013Downstream Taverham Mill (All species)139322
12.1 cm24 Sept 2013Downstream Costessey point (all species)139347
11.8 cm20 Sept 2013Downstream Taverham Mill (All species)139322
11.7 cm20 Sept 2013Downstream Taverham Mill (All species)139322

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
Downstream Costessey point (all species)24 Sept 201324 Sept 20131
Downstream Taverham Mill (All species)20 Sept 201320 Sept 20131
Lenwade Bridge19 Aug 201019 Aug 20101

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

2010–2013

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 16 measured fish were spread across different length ranges.

Smallest
10.9 cm
Lower quarter
11.6 cm
Median
12 cm
Upper quarter
13.4 cm
Largest
15.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 2 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.0042 kg)
Lower quarter
0.2 oz (0.0045 kg)
Median
0.2 oz (0.0048 kg)
Upper quarter
0.2 oz (0.0051 kg)
Heaviest
0.2 oz (0.0054 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 Wensum (Barbel)

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

Barbel Pike Brown / sea trout Chub Dace Minnow

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 →