RiverFish

Perch · Perca fluviatilis

Perch in the River Marlow

Largest measured perch: 10.6 cm

The largest perch measured in Environment Agency surveys of the River Marlow was 10.6 cm, recorded at Marlow Downstream Fry on 22 August 2012.

Across 109 measured perch, the median measured length was 5.5 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 Marlow.

See perch records across England →

Most recent observation4 September 2025Marlow Upstream Fry · 2 fish
Largest measured perch
10.6 cm
Median length
5.5 cm
Fish measured
109
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
10.6 cm22 Aug 2012Marlow Downstream Fry135306
9.6 cm21 Aug 2006Marlow Downstream Fry111826
9.4 cm22 Aug 2012Marlow Upstream Fry135308
9.4 cm21 Aug 2006Marlow Downstream Fry111826
9.2 cm22 Aug 2012Marlow Upstream Fry135308
9.2 cm7 Sept 2004Marlow Downstream Fry111438
8.9 cm21 Aug 2006Marlow Downstream Fry111826
8.6 cm21 Aug 2006Marlow Downstream Fry111826
8.6 cm7 Sept 2004Marlow Downstream Fry111438
8.3 cm4 Sept 2025Marlow Downstream Fry178522

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
Marlow Upstream Fry26 Aug 20034 Sept 20258
Marlow Downstream Fry26 Aug 20034 Sept 202511

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

2003–2025

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 109 measured fish were spread across different length ranges.

Smallest
2.6 cm
Lower quarter
4.8 cm
Median
5.5 cm
Upper quarter
6.8 cm
Largest
10.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Marlow

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

Minnow Gudgeon Chub Roach Bleak 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 →