RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River US Lt Ouse

Largest measured brook lamprey: 12.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River US Lt Ouse was 12.5 cm, recorded at Santon Downham on 2 July 2015.

Across 19 measured brook lamprey, the median measured length was 11.2 cm.

Surveyors recorded weights for 19 brook lamprey. The median was 0.1 oz (0.003 kg) and the largest recorded weight was 0.2 oz (0.005 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 Lt Ouse.

See brook lamprey records across England →

Most recent observation2 July 2015Santon Downham · 3 fish
Largest measured brook lamprey
12.5 cm
Median length
11.2 cm
Fish measured
19
Survey locations
10

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
12.5 cm2 Jul 2015Santon Downham145248
12.3 cm29 Oct 2012Santon Downham134507
12 cm2 Jul 2015Santon Downham145248
12 cm29 Jun 2015Rushford Bridge145181
12 cm10 Oct 2012Two Mile Bottom134070
11.8 cm2 Jul 2015Santon Downham145248
11.8 cm14 Nov 2013Knettishall Heath140028
11.6 cm29 Oct 2012Santon Downham134507
11.3 cm14 Nov 2013Knettishall Heath140028
11.2 cm29 Oct 2012Santon Downham134507

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
Santon Downham10 Feb 19972 Jul 20154
Rushford Bridge19 Feb 199329 Jun 20153
Knettishall Heath19 Jan 200014 Nov 20133
Two Mile Bottom10 Oct 201210 Oct 20121
Abbey Weir23 Feb 19932 Feb 20002
DS BTO Channel26 Jan 200026 Jan 20001
Nunnery Lakes9 Jan 199525 Jan 20002
Barnham Common6 Apr 198924 Jan 20003
Black Carr18 Dec 199518 Dec 19951
Barnham Village6 Apr 19896 Apr 19891

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

1989–2015

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 19 measured fish were spread across different length ranges.

Smallest
9.6 cm
Lower quarter
10.5 cm
Median
11.2 cm
Upper quarter
11.9 cm
Largest
12.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 19 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest
0 oz (0.001 kg)
Lower quarter
0.1 oz (0.002 kg)
Median
0.1 oz (0.003 kg)
Upper quarter
0.2 oz (0.005 kg)
Heaviest
0.2 oz (0.005 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 Lt Ouse

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

Bullhead Pike Dace European eel Gudgeon Perch

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 →