Brook lamprey · Lampetra planeri

Brook lamprey in the River DS Lark

Largest measured brook lamprey: 16.4 cm

The largest brook lamprey measured in Environment Agency surveys of the River DS Lark was 16.4 cm, recorded at Isleham Lock on 14 September 2012.

Across 4 measured brook lamprey, the median measured length was 12.8 cm.

Surveyors recorded weights for 4 brook lamprey. The median was 0.1 oz (0.0035 kg) and the largest recorded weight was 0.2 oz (0.007 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 DS Lark.

See brook lamprey records across England →

Most recent observation20 September 2012Judes Ferry · 3 fish

Largest measured brook lamprey: 16.4 cm
Median length: 12.8 cm
Fish measured: 4
Survey locations: 3

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
16.4 cm	14 Sept 2012	Isleham Lock	133605
12.9 cm	20 Sept 2012	Judes Ferry	133966
12.8 cm	20 Sept 2012	Judes Ferry	133966
12.6 cm	20 Sept 2012	Judes Ferry	133966

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
Judes Ferry	20 Sept 2012	20 Sept 2012	1
Isleham Lock	14 Sept 2012	14 Sept 2012	1
Isleham Backwater	1 Jul 1996	1 Jul 1996	1

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

1996–2012

Survey records by year

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

196

097

098

099

000

001

002

003

004

005

006

007

008

009

010

011

212

Fish measured by surveyors

Measured length distribution

See how the 4 measured fish were spread across different length ranges.

Smallest: 12.6 cm
Lower quarter: 12.8 cm
Median: 12.9 cm
Upper quarter: 13.8 cm
Largest: 16.4 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: 0.1 oz (0.003 kg)
Lower quarter: 0.1 oz (0.003 kg)
Median: 0.1 oz (0.0035 kg)
Upper quarter: 0.2 oz (0.0048 kg)
Heaviest: 0.2 oz (0.007 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 DS Lark

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

Roach Perch Pike Dace Gudgeon Common bream

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 →