Roach · Rutilus rutilus

Roach in the Maidenhead Ditch

Largest measured roach: 23.5 cm

The largest roach measured in Environment Agency surveys of the Maidenhead Ditch was 23.5 cm, recorded at Maidenhead Moor on 13 July 2023.

Across 531 measured roach, the median measured length was 11.2 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Maidenhead Ditch.

See roach records across England →

Most recent observation13 July 2023Braywick Nature Reserve · 7 fish

Largest measured roach: 23.5 cm
Median length: 11.2 cm
Fish measured: 531
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.

Length	Survey date	Survey location	Survey ID
23.5 cm	13 Jul 2023	Maidenhead Moor	162881
23.5 cm	26 Jul 2018	Braywick Nature Reserve	152961
23 cm	6 Jul 2010	Maidenhead Moor	122963
22.8 cm	6 Jul 2010	Maidenhead Moor	122963
22.5 cm	26 Jul 2018	Braywick Nature Reserve	152961
22.4 cm	26 Jul 2018	Braywick Nature Reserve	152961
22.4 cm	6 Jul 2010	Maidenhead Moor	122963
22.3 cm	6 Jul 2010	Maidenhead Moor	122963
22.1 cm	6 Jul 2010	Maidenhead Moor	122963
22 cm	26 Jul 2018	Braywick Nature Reserve	152961

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 surveyed	First recorded	Last recorded	Visits finding roach
Maidenhead Moor	6 Jul 2010	13 Jul 2023	3
Braywick Nature Reserve	14 Jul 2010	13 Jul 2023	3

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

2010–2023

Survey records by year

Each bar shows how many survey visits recorded roach that year.

210

011

012

013

014

015

016

017

218

019

020

021

022

223

Fish measured by surveyors

Measured length distribution

See how the 531 measured fish were spread across different length ranges.

Smallest: 2.5 cm
Lower quarter: 8.4 cm
Median: 11.2 cm
Upper quarter: 13.4 cm
Largest: 23.5 cm

0–99 mm

211

100–199 mm

293

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Maidenhead Ditch

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

Pike 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 →