Brook lamprey · Lampetra planeri

Brook lamprey in the Main Doniford Stream

Largest measured brook lamprey: 19.9 cm

The largest brook lamprey measured in Environment Agency surveys of the Main Doniford Stream was 19.9 cm, recorded at Leigh Cottage on 12 May 1999.

Across 45 measured brook lamprey, the median measured length was 12.3 cm.

Surveyors recorded weights for 25 brook lamprey. The median was 0.2 oz (0.005 kg) and the largest recorded weight was 2.3 oz (0.065 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Main Doniford Stream.

See brook lamprey records across England →

Most recent observation23 April 2013Maggies Field (Se-05) · 20 fish

Largest measured brook lamprey: 19.9 cm
Median length: 12.3 cm
Fish measured: 45
Survey locations: 4

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
19.9 cm	12 May 1999	Leigh Cottage	75944
18.1 cm	9 Apr 1999	Curdon Mill	75945
14.8 cm	12 May 1999	Leigh Cottage	75944
13.9 cm	26 Mar 1999	High Bridge	75948
13.7 cm	9 Apr 1999	Curdon Mill	75945
13.6 cm	12 May 1999	Leigh Cottage	75944
13.5 cm	23 Apr 2013	Maggies Field (Se-05)	135889
13.4 cm	12 May 1999	Leigh Cottage	75944
13.2 cm	12 May 1999	Leigh Cottage	75944
13.1 cm	12 May 1999	Leigh Cottage	75944

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
Maggies Field (Se-05)	11 Apr 2005	23 Apr 2013	2
Leigh Cottage	12 May 1999	12 May 1999	1
Curdon Mill	9 Apr 1999	9 Apr 1999	1
High Bridge	26 Mar 1999	26 Mar 1999	1

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

1999–2013

Survey records by year

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

399

000

001

002

003

004

105

006

007

008

009

010

011

012

113

Fish measured by surveyors

Measured length distribution

See how the 45 measured fish were spread across different length ranges.

Smallest: 10 cm
Lower quarter: 11.5 cm
Median: 12.3 cm
Upper quarter: 13 cm
Largest: 19.9 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 25 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.002 kg)
Lower quarter: 0.1 oz (0.003 kg)
Median: 0.2 oz (0.005 kg)
Upper quarter: 0.2 oz (0.006 kg)
Heaviest: 2.3 oz (0.065 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the Main Doniford Stream

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

Brown / sea trout Bullhead European eel Minnow 3-spined stickleback

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 →