RiverFish

Roach · Rutilus rutilus

Roach in the River Marlow - Cookham

Largest measured roach: 27.3 cm

The largest roach measured in Environment Agency surveys of the River Marlow - Cookham was 27.3 cm, recorded at Marlow - Cookham Upper Main Channel on 3 September 2007.

Across 2,294 measured roach, the median measured length was 10.8 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 roach records across England →

Most recent observation27 July 2025Marlow - Cookham Upper Main Channel · 19 fish
Largest measured roach
27.3 cm
Median length
10.8 cm
Fish measured
2,294
Survey locations
4

Individual EA measurements

Largest measured roach

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

LengthSurvey dateSurvey locationSurvey ID
27.3 cm3 Sept 2007Marlow - Cookham Upper Main Channel106680
26.2 cm1 Sept 2008Cookham Lock Cut114244
26 cm3 Sept 2007Marlow - Cookham Upper Main Channel106680
25.6 cm3 Sept 2007Cookham Lock Cut106664
25.5 cm6 Sept 2004Marlow - Cookham Upper Main Channel82341
25.4 cm1 Sept 2003Marlow - Cookham Upper Main Channel77807
25 cm3 Sept 2007Cookham Lock Cut106664
24.7 cm3 Sept 2007Cookham Lock Cut106664
24.6 cm7 Sept 2009Cookham Lock Cut119000
24.6 cm6 Sept 2004Marlow - Cookham Upper Main Channel82341

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

Explore the river

Where roach were found

Each point marks a survey location with at least one roach 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 roach
Marlow - Cookham Upper Main Channel1 Sept 199527 Jul 202525
Cookham Lock Cut1 Sept 19957 Sept 20094
Marlow Sewage Treatment Outfall1 Sept 199831 Aug 20053
Marlow Weir Pool1 Sept 19951 Sept 19951

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 roach that year.

Fish measured by surveyors

Measured length distribution

See how the 2,294 measured fish were spread across different length ranges.

Smallest
3.1 cm
Lower quarter
9.2 cm
Median
10.8 cm
Upper quarter
13.5 cm
Largest
27.3 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 Perch Pike 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 →