Brook lamprey · Lampetra planeri

Brook lamprey in the River Upper Ouse

Largest measured brook lamprey: 17.6 cm

The largest brook lamprey measured in Environment Agency surveys of the River Upper Ouse was 17.6 cm, recorded at Thornborough Mill on 14 August 2013.

Across 5 measured brook lamprey, the median measured length was 15.2 cm.

Surveyors recorded weights for 4 brook lamprey. The median was 0.4 oz (0.01 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 Upper Ouse.

See brook lamprey records across England →

Most recent observation10 October 2017Brackley · 1 fish

Largest measured brook lamprey: 17.6 cm
Median length: 15.2 cm
Fish measured: 5
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.

Length	Survey date	Survey location	Survey ID
17.6 cm	14 Aug 2013	Thornborough Mill	137864
17.3 cm	10 Oct 2017	Brackley	151912
15.2 cm	5 Sept 2016	Brackley	149158
14.2 cm	3 Oct 2016	Buckingham	149786
14 cm	20 Mar 2006	Water Stratford	90369

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 surveyed	First recorded	Last recorded	Visits finding brook lamprey
Brackley	5 Sept 2016	10 Oct 2017	2
Buckingham	3 Oct 2016	3 Oct 2016	1
Thornborough Mill	14 Aug 2013	14 Aug 2013	1
Mill Farm	15 Apr 2008	15 Apr 2008	1
Water Stratford	24 Mar 1994	20 Mar 2006	3
Stony Stratford	1 Nov 2001	1 Nov 2001	1
Westbury	25 Mar 1997	25 Mar 1997	1
Radclive Mill	24 Mar 1994	24 Mar 1994	1

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

1994–2017

Survey records by year

Each bar shows how many survey visits recorded brook lamprey that year.

294

095

096

297

098

099

000

101

002

003

004

005

106

007

108

009

010

011

012

113

014

015

216

117

Fish measured by surveyors

Measured length distribution

See how the 5 measured fish were spread across different length ranges.

Smallest: 14 cm
Lower quarter: 14.2 cm
Median: 15.2 cm
Upper quarter: 17.3 cm
Largest: 17.6 cm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 4 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.005 kg)
Lower quarter: 0.3 oz (0.0088 kg)
Median: 0.4 oz (0.01 kg)
Upper quarter: 0.4 oz (0.01 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 Upper Ouse

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

Pike Perch Dace Roach Chub 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 →