RiverFish

Roach · Rutilus rutilus

Roach in the River Arun

Largest measured roach: 31.1 cm

The largest roach measured in Environment Agency surveys of the River Arun was 31.1 cm, recorded at Stopham Bridge on 21 October 2025.

Across 4,611 measured roach, the median measured length was 8.8 cm.

Surveyors recorded weights for 3,030 roach. The median was 0.4 oz (0.011 kg) and the largest recorded weight was 12.3 oz (0.349 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 Arun.

See roach records across England →

Most recent observation21 October 2025Stopham Bridge · 44 fish
Largest measured roach
31.1 cm
Median length
8.8 cm
Fish measured
4,611
Survey locations
18

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
31.1 cm21 Oct 2025Stopham Bridge179497
26.4 cm30 Jul 2002Newbridge61443
24.9 cm31 Jul 2012Horsham STW132576
23.7 cm15 Jul 2008Pallingham112074
23.5 cm19 Jul 2005Roman Station86984
23.5 cm2 Aug 2004Newbridge80803
23.3 cm13 Jul 2005Bucks Green86979
22.8 cm9 Jul 2025Horsham Downstream Pack Horse Bridge177296
22.5 cm21 Jul 2004Bucks Green80813
22.5 cm24 Jul 2003Bucks Green76694

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
Stopham Bridge21 Oct 202521 Oct 20251
Crosby Farm10 Sept 202510 Sept 20251
Theale Farm9 Sept 201429 Jul 20252
Horsham Downstream Pack Horse Bridge26 Jul 20229 Jul 20252
Pallingham18 Sept 20038 Jul 202513
Bignor Farm12 Sept 200212 Sept 20248
Alfoldean Weir Upstream12 Jul 202412 Jul 20241
Pulborough Cut28 Sept 20075 Sept 20228
Roman Station30 Jul 200223 Jul 201913
Chesworth Farm, Downstream Chesworth House20 Sept 20124 Aug 20162
Horsham STW1 Aug 200226 Jul 201612
Bucks Green16 Aug 200227 Sept 20076
Wellcross Bridge2 Aug 20052 Aug 20072
Newbridge30 Jul 200227 Jul 20076
Chesworth Farm2 Aug 200214 Aug 20065
Gibbons Mill31 Jul 200226 Jul 20065
Violets Farm sq8 Sept 20058 Sept 20051
Horsham-by-Pass sq2 Aug 20052 Aug 20051

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

2002–2025

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 4,611 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
6.2 cm
Median
8.8 cm
Upper quarter
12.1 cm
Largest
31.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 3,030 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 (0.004 kg)
Median
0.4 oz (0.011 kg)
Upper quarter
1.1 oz (0.03 kg)
Heaviest
12.3 oz (0.349 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 Arun

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

Chub Gudgeon European eel Minnow 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 →