RiverFish

Roach · Rutilus rutilus

Roach in the River Marlow

Largest measured roach: 13.4 cm

The largest roach measured in Environment Agency surveys of the River Marlow was 13.4 cm, recorded at Marlow Downstream Fry on 29 August 2013.

Across 1,764 measured roach, the median measured length was 3.5 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 roach records across England →

Most recent observation4 September 2025Marlow Downstream Fry · 2 fish
Largest measured roach
13.4 cm
Median length
3.5 cm
Fish measured
1,764
Survey locations
2

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
13.4 cm29 Aug 2013Marlow Downstream Fry138580
11.6 cm22 Aug 2012Marlow Downstream Fry135306
11.5 cm18 Aug 2009Marlow Upstream Fry120421
11.4 cm22 Aug 2012Marlow Upstream Fry135308
10.6 cm1 Sept 2023Marlow Downstream Fry164323
10.2 cm26 Aug 2003Marlow Downstream Fry112211
9.6 cm26 Aug 2003Marlow Downstream Fry112211
9.3 cm19 Aug 2008Marlow Downstream Fry125580
8.7 cm26 Aug 2003Marlow Downstream Fry112211
8.5 cm26 Aug 2003Marlow Upstream Fry116981

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 Downstream Fry26 Aug 20034 Sept 202515
Marlow Upstream Fry26 Aug 200324 Aug 201713

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 roach that year.

Fish measured by surveyors

Measured length distribution

See how the 1,764 measured fish were spread across different length ranges.

Smallest
1 cm
Lower quarter
3.2 cm
Median
3.5 cm
Upper quarter
3.9 cm
Largest
13.4 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 Bleak Dace Perch

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 →