RiverFish

Perch · Perca fluviatilis

Perch in the River Old Windsor

Largest measured perch: 14.7 cm

The largest perch measured in Environment Agency surveys of the River Old Windsor was 14.7 cm, recorded at Old Windsor Upstream Fry on 21 August 2007.

Across 108 measured perch, the median measured length was 7 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.

See perch records across England →

Most recent observation3 September 2025Old Windsor Upstream Fry · 11 fish
Largest measured perch
14.7 cm
Median length
7 cm
Fish measured
108
Survey locations
2

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
14.7 cm21 Aug 2007Old Windsor Upstream Fry108618
14.2 cm20 Sept 2006Old Windsor Downstream Fry111934
13.7 cm21 Aug 2018Old Windsor Downstream Fry153458
13.7 cm21 Aug 2007Old Windsor Upstream Fry108618
13 cm20 Sept 2006Old Windsor Downstream Fry111934
12.8 cm21 Aug 2007Old Windsor Upstream Fry108618
11.4 cm3 Sept 2025Old Windsor Upstream Fry178527
10.8 cm20 Sept 2006Old Windsor Downstream Fry111934
10.7 cm3 Sept 2025Old Windsor Upstream Fry178527
10.7 cm3 Sept 2025Old Windsor Upstream Fry178527

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
Old Windsor Upstream Fry21 Aug 20073 Sept 20257
Old Windsor Downstream Fry20 Sept 200620 Aug 20248

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

2006–2025

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 108 measured fish were spread across different length ranges.

Smallest
4.2 cm
Lower quarter
6.2 cm
Median
7 cm
Upper quarter
7.8 cm
Largest
14.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Old Windsor

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

Dace Gudgeon Chub Roach Minnow Bleak

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 →