Brook lamprey · Lampetra planeri

Brook lamprey in the River Gowy

Largest measured brook lamprey: 20.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Gowy was 20.5 cm, recorded at Gwgo05 on 15 April 2003.

Across 41 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 River Gowy.

See brook lamprey records across England →

Most recent observation27 April 2006Gwgo05 · 22 fish

Largest measured brook lamprey: 20.5 cm
Median length: 13 cm
Fish measured: 41
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
20.5 cm	15 Apr 2003	Gwgo05	75837
19 cm	15 Apr 2003	Gwgo05	75837
17 cm	11 Apr 2005	Gwgo20	84451
17 cm	15 Apr 2003	Gwgo05	75837
16 cm	27 Apr 2006	Gwgo05	90698
16 cm	26 Apr 2005	Gwgo05	84476
16 cm	15 Apr 2003	Gwgo05	75837
15.7 cm	27 Apr 2006	Gwgo05	90698
15.5 cm	27 Apr 2006	Gwgo05	90698
15.5 cm	26 Apr 2005	Gwgo05	84476

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
Gwgo05	15 Apr 2003	27 Apr 2006	4
Gwgo20	11 Apr 2005	11 Apr 2005	1
Gwgo10	15 Apr 2003	15 Apr 2003	1

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

2003–2006

Survey records by year

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

203

104

205

106

Fish measured by surveyors

Measured length distribution

See how the 41 measured fish were spread across different length ranges.

Smallest: 8.5 cm
Lower quarter: 12 cm
Median: 13 cm
Upper quarter: 15 cm
Largest: 20.5 cm

0–99 mm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Gowy

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

European eel Stone loach 3-spined stickleback Gudgeon Roach Bullhead

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 →