RiverFish

Perch · Perca fluviatilis

Perch in the River Old Windsor - Bell

Largest measured perch: 41.7 cm

The largest perch measured in Environment Agency surveys of the River Old Windsor - Bell was 41.7 cm, recorded at Ham Loop on 29 August 2025.

Across 704 measured perch, the median measured length was 15.5 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 Old Windsor - Bell.

See perch records across England →

Most recent observation29 August 2025Ham Loop · 19 fish
Largest measured perch
41.7 cm
Median length
15.5 cm
Fish measured
704
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
41.7 cm29 Aug 2025Ham Loop178539
41.3 cm10 Sept 2009Ham Loop119012
34.7 cm9 Sept 2015Ham Loop146405
34.1 cm10 Sept 2004Ham Loop82343
33.9 cm10 Sept 2004Ham Loop82343
33.2 cm5 Sept 2003Ham Loop77010
32.2 cm9 Sept 2015Ham Loop146405
31.6 cm9 Sept 2015Ham Loop146405
31.5 cm8 Sept 2006Old Windsor Main Channel101380
31.4 cm7 Sept 2007Ham Loop106744

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
Ham Loop1 Sept 200029 Aug 202523
Old Windsor Main Channel1 Sept 19955 Sept 20138
Old Windsor, Weir Pool1 Sept 19957 Sept 20077
Upper Old Windsor Main Channel7 Sept 20057 Sept 20051
Lower Old Windsor Main Channel7 Sept 20057 Sept 20051

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

1995–2025

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 704 measured fish were spread across different length ranges.

Smallest
4 cm
Lower quarter
13 cm
Median
15.5 cm
Upper quarter
18.1 cm
Largest
41.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Old Windsor - Bell

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

Roach Pike Bleak European eel Chub Dace

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 →