Brook lamprey · Lampetra planeri

Brook lamprey in the River Frome

Largest measured brook lamprey: 16.6 cm

The largest brook lamprey measured in Environment Agency surveys of the River Frome was 16.6 cm, recorded at Millend on 7 September 2011.

Across 72 measured brook lamprey, the median measured length was 13.9 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 Frome.

See brook lamprey records across England →

Most recent observation14 September 2011Chalford · 2 fish

Largest measured brook lamprey: 16.6 cm
Median length: 13.9 cm
Fish measured: 72
Survey locations: 7

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
16.6 cm	7 Sept 2011	Millend	128190
16.5 cm	7 Sept 2011	Millend	128190
16.5 cm	7 Sept 2011	Millend	128190
16.5 cm	7 Sept 2011	Millend	128190
16.5 cm	7 Sept 2011	Millend	128190
16.4 cm	7 Sept 2011	Millend	128190
16.2 cm	7 Sept 2011	Millend	128190
16.1 cm	7 Sept 2011	Millend	128190
16 cm	17 Sept 2002	Ryeford	61400
15.5 cm	8 Sept 2011	Bullbanks	127858

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
Chalford	16 Mar 1992	14 Sept 2011	3
Ryeford	17 Sept 2002	13 Sept 2011	4
Bullbanks	8 Sept 2011	8 Sept 2011	1
Millend	7 Sept 2011	7 Sept 2011	1
Churchend, North Arm	7 Sept 2011	7 Sept 2011	1
Snow Business	11 Sept 2007	11 Sept 2007	1
Miserden	16 Mar 1992	16 Mar 1992	1

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

1992–2011

Survey records by year

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

292

093

094

095

096

097

098

099

000

001

102

003

104

005

006

107

108

109

010

511

Fish measured by surveyors

Measured length distribution

See how the 72 measured fish were spread across different length ranges.

Smallest: 7.5 cm
Lower quarter: 11.7 cm
Median: 14 cm
Upper quarter: 15.1 cm
Largest: 16.6 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Frome

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

Brown / sea trout Bullhead European eel 3-spined stickleback Roach Pike

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 →