RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Ter (Headwaters)

Largest measured brook lamprey: 17.3 cm

The largest brook lamprey measured in Environment Agency surveys of the River Ter (Headwaters) was 17.3 cm, recorded at Lyons Hall (River Ter) on 9 March 2005.

Across 10 measured brook lamprey, the median measured length was 15.8 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 Ter (Headwaters).

See brook lamprey records across England →

Most recent observation9 March 2005Lyons Hall (River Ter) · 5 fish
Largest measured brook lamprey
17.3 cm
Median length
15.8 cm
Fish measured
10
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
17.3 cm9 Mar 2005Lyons Hall (River Ter)84252
17 cm9 Mar 2005Ridley Hall84250
16.5 cm9 Mar 2005Lyons Hall (River Ter)84252
16.4 cm9 Mar 2005Lyons Hall (River Ter)84252
16 cm9 Mar 2005Ridley Hall84250
15.7 cm9 Mar 2005Lyons Hall (River Ter)84252
15.4 cm9 Mar 2005Lyons Hall (River Ter)84252
15 cm9 Mar 2005Ridley Hall84250
14 cm9 Mar 2005Ridley Hall84250
11.5 cm9 Mar 2005Ridley Hall84250

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
Ridley Hall17 Feb 19989 Mar 20052
Lyons Hall (River Ter)9 Mar 20059 Mar 20051
Great Leighs STW11 Feb 199811 Feb 19981

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

1998–2005

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 10 measured fish were spread across different length ranges.

Smallest
11.5 cm
Lower quarter
15.1 cm
Median
15.9 cm
Upper quarter
16.5 cm
Largest
17.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ter (Headwaters)

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

3-spined stickleback Bullhead Brown / sea trout Stone loach Minnow European eel

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 →