RiverFish

River lamprey · Lampetra fluviatilis

River lamprey in the River Stiffkey

Largest measured river lamprey: 25.5 cm

The largest river lamprey measured in Environment Agency surveys of the River Stiffkey was 25.5 cm, recorded at Downstream Wighton Bridge on 23 April 2014.

Across 2 measured river lamprey, the median measured length was 17.9 cm.

Surveyors recorded weights for 2 river lamprey. The median was 0.6 oz (0.018 kg) and the largest recorded weight was 1 oz (0.028 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 river lamprey records across England →

Most recent observation23 April 2014Downstream Wighton Bridge · 1 fish
Largest measured river lamprey
25.5 cm
Median length
17.9 cm
Fish measured
2
Survey locations
4

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
25.5 cm23 Apr 2014Downstream Wighton Bridge140921
10.3 cm24 Apr 2007Upstream Home Farm105290

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
Downstream Wighton Bridge23 Apr 201423 Apr 20141
Upstream Home Farm24 Apr 200724 Apr 20071
Warham14 Apr 198814 Apr 19881
Great Walsingham13 Apr 198813 Apr 19881

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

1988–2014

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 2 measured fish were spread across different length ranges.

Smallest
10.3 cm
Lower quarter
14.1 cm
Median
17.9 cm
Upper quarter
21.7 cm
Largest
25.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

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

Lightest
0.3 oz (0.008 kg)
Lower quarter
0.5 oz (0.013 kg)
Median
0.6 oz (0.018 kg)
Upper quarter
0.8 oz (0.023 kg)
Heaviest
1 oz (0.028 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 Brook lamprey

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 →