RiverFish

Roach · Rutilus rutilus

Roach in the River Wandle

Largest measured roach: 33.9 cm

The largest roach measured in Environment Agency surveys of the River Wandle was 33.9 cm, recorded at Ravensbury Park on 20 September 2007.

Across 3,092 measured roach, the median measured length was 15.7 cm.

Surveyors recorded weights for 222 roach. The median was 3.2 oz (0.09 kg) and the largest recorded weight was 2 lb 9.1 oz (1.17 kg).

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

See roach records across England →

Most recent observation8 October 2025Watermeads Lane · 2 fish
Largest measured roach
33.9 cm
Median length
15.7 cm
Fish measured
3,092
Survey locations
14

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
33.9 cm20 Sept 2007Ravensbury Park106930
32.1 cm22 Jul 1997Wilderness Island116973
31.5 cm26 Jun 2019Sainsburys Merton154745
31.2 cm5 Jul 2017Sainsburys Merton150962
30.8 cm5 Jul 2017Sainsburys Merton150962
30.7 cm26 Jun 2019Sainsburys Merton154745
30.3 cm5 Jul 2017Sainsburys Merton150962
29.2 cm5 Jul 2017Sainsburys Merton150962
29.2 cm5 Jul 2017Sainsburys Merton150962
29.1 cm12 May 2004Hackbridge80121

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
Watermeads Lane22 Jul 19888 Oct 20257
Mapleton Road18 Jun 20097 Oct 20257
Sainsburys Merton12 Jun 20091 Oct 20257
Ravensbury Park20 Sept 200730 Sept 20257
Waterside Way2 Jul 20192 Jul 20191
Phipps Bridge12 Jun 200926 Jun 20195
Trewint Street - Weir Road9 Jun 201111 Jun 20132
King George Park27 Jul 198811 Jun 201310
Hackbridge21 Jul 19884 Jun 201312
Church Road11 Apr 200220 Apr 20063
Hackbridge Weir Pool22 Apr 200222 Apr 20021
Wilderness Island22 Jul 199722 Jul 19971
North road, Colliers Wood29 Mar 199417 Jul 19972
The Causeway, Wandsworth29 Jun 199429 Jun 19941

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

1988–2025

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 3,092 measured fish were spread across different length ranges.

Smallest
1.1 cm
Lower quarter
13.8 cm
Median
15.7 cm
Upper quarter
19 cm
Largest
33.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 222 roach. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.002 kg)
Lower quarter
2 oz (0.0562 kg)
Median
3.2 oz (0.09 kg)
Upper quarter
4.7 oz (0.1328 kg)
Heaviest
2 lb 9.1 oz (1.17 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Wandle

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

3-spined stickleback Stone loach European eel Chub Dace Bullhead

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 →