Roach · Rutilus rutilus

Roach in the River Knepp Castle

Largest measured roach: 17.3 cm

The largest roach measured in Environment Agency surveys of the River Knepp Castle was 17.3 cm, recorded at Downstream Capp's Bridge on 24 September 2009.

Across 84 measured roach, the median measured length was 8.4 cm.

Surveyors recorded weights for 4 roach. The median was 0.1 oz (0.0025 kg) and the largest recorded weight was 0.1 oz (0.004 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 Knepp Castle.

See roach records across England →

Most recent observation24 September 2009Downstream Capp's Bridge · 32 fish

Largest measured roach: 17.3 cm
Median length: 8.4 cm
Fish measured: 84
Survey locations: 3

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
17.3 cm	24 Sept 2009	Downstream Capp's Bridge	119635
16.7 cm	24 Sept 2009	Downstream Capp's Bridge	119635
16.3 cm	24 Sept 2009	Downstream Capp's Bridge	119635
15.9 cm	24 Sept 2009	Upstream A24 Weir	119613
15.4 cm	24 Sept 2009	Upstream A24 Weir	119613
15.1 cm	24 Sept 2009	Downstream Capp's Bridge	119635
15 cm	24 Sept 2009	Downstream Capp's Bridge	119635
14.8 cm	24 Sept 2009	Downstream Capp's Bridge	119635
14.8 cm	24 Sept 2009	Downstream Capp's Bridge	119635
14.5 cm	24 Sept 2009	Downstream Capp's Bridge	119635

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
Upstream A24 Weir	24 Sept 2009	24 Sept 2009	1
Downstream Capp's Bridge	24 Sept 2009	24 Sept 2009	1
Knepp Mill cottages	11 Feb 1998	11 Feb 1998	1

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

1998–2009

Survey records by year

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

198

099

000

001

002

003

004

005

006

007

008

209

Fish measured by surveyors

Measured length distribution

See how the 84 measured fish were spread across different length ranges.

Smallest: 2.6 cm
Lower quarter: 4.2 cm
Median: 8.5 cm
Upper quarter: 12.9 cm
Largest: 17.3 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 4 roach. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0.1 oz (0.0018 kg)
Median: 0.1 oz (0.0025 kg)
Upper quarter: 0.1 oz (0.0032 kg)
Heaviest: 0.1 oz (0.004 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 Knepp Castle

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

European eel Perch Pike

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 →