RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Stiffkey

Largest measured brook lamprey: 19.8 cm

The largest brook lamprey measured in Environment Agency surveys of the River Stiffkey was 19.8 cm, recorded at Downstream Wighton Bridge on 15 October 2009.

Across 500 measured brook lamprey, the median measured length was 12.7 cm.

Surveyors recorded weights for 67 brook lamprey. The median was 0.2 oz (0.007 kg) and the largest recorded weight was 0.4 oz (0.01 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 Stiffkey.

See brook lamprey records across England →

Most recent observation1 May 2026Upstream Home Farm · 7 fish
Largest measured brook lamprey
19.8 cm
Median length
12.7 cm
Fish measured
500
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
19.8 cm15 Oct 2009Downstream Wighton Bridge119556
18.4 cm10 May 2011East Barsham126942
18.3 cm29 Apr 2014East Barsham140924
18 cm29 Apr 2014East Barsham140924
18 cm11 May 2011Upstream Home Farm126944
17.8 cm29 Apr 2014East Barsham140924
17.7 cm29 Apr 2014East Barsham140924
17.6 cm29 Apr 2014East Barsham140924
17.5 cm8 Apr 2026Great Walsingham180934
17.4 cm29 Apr 2014East Barsham140924

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 Home Farm25 Feb 19921 May 20267
Downstream Wighton Bridge21 Feb 199230 Apr 20269
Warham27 Feb 199222 Apr 20267
Upstream Little Walsingham12 Apr 198810 Apr 20269
Great Walsingham13 Apr 19888 Apr 202610
East Barsham11 Apr 198830 Jun 20218
Great Snoring23 Mar 199523 Mar 19951
Cockthorpe Common26 Feb 199226 Feb 19921

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

1988–2026

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 500 measured fish were spread across different length ranges.

Smallest
3.6 cm
Lower quarter
11 cm
Median
12.7 cm
Upper quarter
13.8 cm
Largest
19.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 67 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.004 kg)
Lower quarter
0.2 oz (0.005 kg)
Median
0.2 oz (0.007 kg)
Upper quarter
0.3 oz (0.008 kg)
Heaviest
0.4 oz (0.01 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 Stiffkey

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

Brown / sea trout Bullhead European eel Stone loach 3-spined stickleback Gudgeon

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 →