RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Douglas

Largest measured brook lamprey: 17 cm

The largest brook lamprey measured in Environment Agency surveys of the River Douglas was 17 cm, recorded at Squirrel Lane on 25 June 2001.

Across 109 measured brook lamprey, the median measured length was 11 cm.

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

See brook lamprey records across England →

Most recent observation7 July 2017Squirrel Lane · 20 fish
Largest measured brook lamprey
17 cm
Median length
11 cm
Fish measured
109
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.

LengthSurvey dateSurvey locationSurvey ID
17 cm25 Jun 2001Squirrel Lane90440
14 cm7 Jul 2017Squirrel Lane150896
14 cm21 Jun 2013Squirrel Lane136512
14 cm21 Jun 2013Squirrel Lane136512
14 cm21 Jun 2013Squirrel Lane136512
14 cm25 Jun 2001Swallows Rise (Star Lane)90442
13 cm21 Jun 2013Squirrel Lane136512
13 cm21 Jun 2013Squirrel Lane136512
13 cm21 Jun 2013Squirrel Lane136512
13 cm21 Jun 2013Squirrel Lane136512

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
Squirrel Lane17 Jul 20007 Jul 20177
Swallows Rise (Star Lane)25 Jun 200114 Jul 20053
Downstream Rivington WWTW (Mill Bridge)14 Jun 199514 Jun 19951

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

1995–2017

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 109 measured fish were spread across different length ranges.

Smallest
7 cm
Lower quarter
9 cm
Median
11 cm
Upper quarter
12 cm
Largest
17 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Douglas

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

Roach Chub Gudgeon Dace European eel 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 →