RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the Cod Beck

Largest measured brook lamprey: 16 cm

The largest brook lamprey measured in Environment Agency surveys of the Cod Beck was 16 cm, recorded at Broad Beck nr Borrowby on 23 September 2015.

Across 11 measured brook lamprey, the median measured length was 13 cm.

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

See brook lamprey records across England →

Most recent observation24 August 2016Thirkleby Beck at Thirkleby · 3 fish
Largest measured brook lamprey
16 cm
Median length
13 cm
Fish measured
11
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.

LengthSurvey dateSurvey locationSurvey ID
16 cm23 Sept 2015Broad Beck nr Borrowby146638
16 cm23 Sept 2015Broad Beck at Mill Hill146634
15 cm23 Sept 2015Broad Beck nr Borrowby146638
15 cm23 Sept 2015Broad Beck at Mill Hill146634
14 cm23 Sept 2015Broad Beck nr Borrowby146638
13 cm23 Sept 2015Broad Beck at Mill Hill146634
12 cm23 Sept 2015Broad Beck nr Borrowby146638
8 cm23 Sept 2015Broad Beck nr Borrowby146638
7 cm23 Sept 2015Broad Beck nr Borrowby146638
6.5 cm23 Sept 2015Broad Beck nr Borrowby146638

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
Thirkleby Beck at Thirkleby24 Aug 201624 Aug 20161
Broad Beck nr Borrowby23 Sept 201523 Sept 20151
Broad Beck at Mill Hill23 Sept 201523 Sept 20151
Thirkleby at A1910 Jun 201010 Jun 20101

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

2010–2016

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 11 measured fish were spread across different length ranges.

Smallest
6.5 cm
Lower quarter
7.5 cm
Median
13 cm
Upper quarter
15 cm
Largest
16 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Cod Beck

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

Brown / sea trout Bullhead Stone loach Minnow Grayling Dace

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 →