RiverFish

Perch · Perca fluviatilis

Perch in the River Marlow - Cookham

Largest measured perch: 46 cm

The largest perch measured in Environment Agency surveys of the River Marlow - Cookham was 46 cm, recorded at Marlow - Cookham Upper Main Channel on 18 July 2024.

Across 513 measured perch, the median measured length was 15.7 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 Marlow - Cookham.

See perch records across England →

Most recent observation27 July 2025Marlow - Cookham Upper Main Channel · 2 fish
Largest measured perch
46 cm
Median length
15.7 cm
Fish measured
513
Survey locations
4

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
46 cm18 Jul 2024Marlow - Cookham Upper Main Channel165849
41.6 cm7 Sept 2015Marlow - Cookham Upper Main Channel146402
40.6 cm7 Sept 2015Marlow - Cookham Upper Main Channel146402
39.6 cm18 Jul 2024Marlow - Cookham Upper Main Channel165849
39.5 cm5 Sept 2016Marlow - Cookham Upper Main Channel149244
39.5 cm3 Sept 2012Marlow - Cookham Upper Main Channel133655
39.4 cm3 Sept 2012Marlow - Cookham Upper Main Channel133655
39.2 cm18 Jul 2024Marlow - Cookham Upper Main Channel165849
39.2 cm18 Jul 2024Marlow - Cookham Upper Main Channel165849
39.2 cm1 Sept 2014Marlow - Cookham Upper Main Channel142522

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 - Cookham Upper Main Channel1 Sept 199527 Jul 202524
Cookham Lock Cut1 Sept 19957 Sept 20094
Marlow Weir Pool1 Sept 199531 Aug 20053
Marlow Sewage Treatment Outfall1 Sept 199831 Aug 20053

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 513 measured fish were spread across different length ranges.

Smallest
3.6 cm
Lower quarter
13.5 cm
Median
15.7 cm
Upper quarter
20.5 cm
Largest
46 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Marlow - Cookham

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

Bleak Pike Roach Chub Dace Gudgeon

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 →