RiverFish

Brook lamprey · Lampetra planeri

Brook lamprey in the River Goyt

Largest measured brook lamprey: 18 cm

The largest brook lamprey measured in Environment Agency surveys of the River Goyt was 18 cm, recorded at Gygo06 on 8 July 2025.

Across 127 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 Goyt.

See brook lamprey records across England →

Most recent observation10 September 2025Gygo25 · 5 fish
Largest measured brook lamprey
18 cm
Median length
13 cm
Fish measured
127
Survey locations
9

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
18 cm8 Jul 2025Gygo06177311
18 cm22 Sept 2010Go03124047
18 cm8 Jun 2006Go02100870
17.5 cm4 Sept 2025Gygo16180074
17 cm4 Sept 2025Gygo16180074
17 cm4 Sept 2025Gygo16180074
17 cm4 Sept 2025Gygo16180074
16.9 cm4 Sept 2025Gygo20180111
16.2 cm4 Sept 2025Gygo20180111
16.1 cm9 Jul 2025Gygo10179864

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
Gygo2510 Sept 202510 Sept 20251
Gygo204 Sept 20254 Sept 20251
Gygo164 Sept 20254 Sept 20251
Gygo143 Sept 20253 Sept 20251
Gygo052 Sept 20252 Sept 20251
Gygo107 Jul 20049 Jul 20252
Gygo068 Jul 20258 Jul 20251
Go039 May 200317 Jun 20257
Go0225 May 199417 Jun 20256

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

1994–2025

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 127 measured fish were spread across different length ranges.

Smallest
0.6 cm
Lower quarter
11 cm
Median
13 cm
Upper quarter
14.8 cm
Largest
18 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Goyt

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

Brown / sea trout Bullhead Grayling Stone loach 3-spined stickleback Perch

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 →