RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Itchen

Largest measured brook lamprey: 15 cm

The largest brook lamprey measured in Environment Agency surveys of the River Itchen was 15 cm, recorded at Mansbridge on 1 September 2025.

Across 311 measured brook lamprey, the median measured length was 8.6 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 Itchen.

See brook lamprey records across England →

Most recent observation5 September 2025Brambridge main "Kanara" · 2 fish
Largest measured brook lamprey
15 cm
Median length
8.6 cm
Fish measured
311
Survey locations
23

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
15 cm1 Sept 2025Mansbridge178992
15 cm31 Aug 2022Swimming Pool, Winchester161442
14.5 cm5 Sept 2023Lower Bishopstoke Fishery163205
14.3 cm1 Sept 2020Lower Itchen Fishery - d/s viaduct156373
14.2 cm30 Aug 2022Lower Bishopstoke Fishery161377
14 cm10 Sept 2021Hockley Mill160309
13.6 cm2 Sept 2021Toby Carvery Bishopstoke160250
13.5 cm2 Sept 2021Shawford, upstream of Norris's Bridge160289
13.5 cm31 Aug 2010Bishopstoke Barge123804
13.4 cm1 Sept 2022Brambridge161451

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
St Cross Mill2 Sept 20245 Sept 20252
St Cross Bridge13 Sept 20185 Sept 20257
Brambridge main "Kanara"6 Sept 20235 Sept 20253
Swimming Pool, Winchester13 Sept 20183 Sept 20258
Shipley Bridge, Otterbourne6 Sept 20193 Sept 20256
Lower Bishopstoke Fishery10 Sept 20183 Sept 20258
Hockley Mill10 Sept 20183 Sept 20257
Caravan Pool, Highbridge11 Sept 20183 Sept 20257
Brambridge11 Sept 20183 Sept 20258
Toby Carvery Bishopstoke10 Sept 20182 Sept 20258
Mansbridge10 Sept 20181 Sept 20258
Lower Itchen Fishery - Hut Run7 Sept 20231 Sept 20253
Bishopstoke Barge31 Aug 201029 Aug 20256
Abbots Worthy, u/s Mill16 Oct 201819 Oct 20242
Lower Itchen Fishery - d/s viaduct2 Sept 20156 Sept 20247
Shawford, upstream of Norris's Bridge13 Sept 20182 Sept 20247
Shawford Park6 Oct 200822 Sept 20234
Wolvesey Lodge8 Sept 201122 Aug 20194
Abbots Worthy, Rochienne's control24 Oct 201824 Oct 20181
Abbott's Barton, duck's nest spinney27 Sept 201027 Sept 20101
Abbott's Barton Upper27 Sept 201027 Sept 20101
Chilland House11 Aug 200911 Aug 20091
Bishopstoke Lock5 Sept 20025 Sept 20021

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

2002–2025

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 311 measured fish were spread across different length ranges.

Smallest
2.4 cm
Lower quarter
7 cm
Median
8.6 cm
Upper quarter
11 cm
Largest
15 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Itchen

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

Brown / sea trout Bullhead Minnow European eel Atlantic salmon Grayling

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 →