RiverFish

Perch · Perca fluviatilis

Perch in the River Lymn FMU

Largest measured perch: 35.5 cm

The largest perch measured in Environment Agency surveys of the River Lymn FMU was 35.5 cm, recorded at Mill Bridge on 19 July 2024.

Across 298 measured perch, the median measured length was 10.2 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 Lymn FMU.

See perch records across England →

Most recent observation7 November 2025Mill Bridge · 60 fish
Largest measured perch
35.5 cm
Median length
10.2 cm
Fish measured
298
Survey locations
5

Individual EA measurements

Largest measured perch

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
35.5 cm19 Jul 2024Mill Bridge166215
35.5 cm19 Jul 2024Mill Bridge166215
33.8 cm19 Jul 2024Mill Bridge166215
29.3 cm16 Aug 2006Mill Bridge100692
27.4 cm7 Nov 2025Mill Bridge179994
25.1 cm19 Jul 2024Mill Bridge166215
19.2 cm7 Nov 2025Mill Bridge179994
19 cm29 Apr 2002Mill Bridge59065
19 cm2 Apr 1996Moat House Farm58153
18.4 cm7 Nov 2025Mill Bridge179994

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where perch were found

Each point marks a survey location with at least one perch 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 perch
Mill Bridge3 Apr 19967 Nov 202510
Stockwith Mill6 Sept 201918 Jul 20242
Raithby Bridge13 Jun 20126 Jun 20244
Partney Bridge23 Apr 20076 Jun 20244
Moat House Farm2 Apr 19962 Apr 19961

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

1996–2025

Survey records by year

Each bar shows how many survey visits recorded perch that year.

Fish measured by surveyors

Measured length distribution

See how the 298 measured fish were spread across different length ranges.

Smallest
4.4 cm
Lower quarter
8.1 cm
Median
10.2 cm
Upper quarter
12.4 cm
Largest
35.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Lymn FMU

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

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

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 →