Roach · Rutilus rutilus

Roach in the River Ouse Tributaries

Largest measured roach: 21.8 cm

The largest roach measured in Environment Agency surveys of the River Ouse Tributaries was 21.8 cm, recorded at Shell Brook d/s Ardingly Reservoir on 24 August 2021.

Across 595 measured roach, the median measured length was 11.8 cm.

Surveyors recorded weights for 144 roach. The median was 1.1 oz (0.03 kg) and the largest recorded weight was 5 oz (0.142 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 Ouse Tributaries.

See roach records across England →

Most recent observation20 September 2023Shell Brook d/s Ardingly Reservoir · 52 fish

Largest measured roach: 21.8 cm
Median length: 11.8 cm
Fish measured: 595
Survey locations: 5

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
21.8 cm	24 Aug 2021	Shell Brook d/s Ardingly Reservoir	160161
21.5 cm	20 Sept 2023	Shell Brook d/s Ardingly Reservoir	163802
21.2 cm	26 Aug 2003	Pellingford Brook	77001
21 cm	5 Sept 2018	Balcombe/Lower Lodge Gill	153190
20.2 cm	15 Jul 2011	Balcombe/Lower Lodge Gill	126976
19.6 cm	20 Sept 2023	Shell Brook d/s Ardingly Reservoir	163802
19.6 cm	5 Sept 2018	Balcombe/Lower Lodge Gill	153190
19.5 cm	5 Sept 2018	Balcombe/Lower Lodge Gill	153190
19.5 cm	15 Jul 2011	Balcombe/Lower Lodge Gill	126976
19.3 cm	5 Sept 2018	Balcombe/Lower Lodge Gill	153190

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
Shell Brook d/s Ardingly Reservoir	24 Aug 2021	20 Sept 2023	2
Balcombe/Lower Lodge Gill	12 Aug 2003	5 Sept 2018	5
Pellingford Brook	26 Aug 2003	15 Aug 2013	2
North End	22 Aug 2003	6 Aug 2013	2
Andrew's Stream	29 Sept 2009	29 Sept 2009	1

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

2003–2023

Survey records by year

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

303

004

005

006

007

008

109

010

111

012

213

114

015

016

017

218

019

020

121

022

123

Fish measured by surveyors

Measured length distribution

See how the 595 measured fish were spread across different length ranges.

Smallest: 3.5 cm
Lower quarter: 9 cm
Median: 11.8 cm
Upper quarter: 13.7 cm
Largest: 21.8 cm

0–99 mm

211

100–199 mm

379

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 144 roach. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.006 kg)
Lower quarter: 0.8 oz (0.0218 kg)
Median: 1.1 oz (0.03 kg)
Upper quarter: 1.4 oz (0.039 kg)
Heaviest: 5 oz (0.142 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 Ouse Tributaries

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

Brown / sea trout Dace Bullhead Gudgeon Chub 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 →