Roach · Rutilus rutilus

Roach in the River Box (Main Reaches)

Largest measured roach: 29.1 cm

The largest roach measured in Environment Agency surveys of the River Box (Main Reaches) was 29.1 cm, recorded at Scotland Street on 15 April 1988.

Across 2,294 measured roach, the median measured length was 11.3 cm.

Surveyors recorded weights for 6 roach. The median was 0.5 oz (0.0155 kg) and the largest recorded weight was 0.8 oz (0.022 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 Box (Main Reaches).

See roach records across England →

Most recent observation22 May 2026Stour Confluence · 115 fish

Largest measured roach: 29.1 cm
Median length: 11.3 cm
Fish measured: 2,294
Survey locations: 7

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
29.1 cm	15 Apr 1988	Scotland Street	13781
28.5 cm	15 Apr 1988	Scotland Street	13781
28.2 cm	14 Apr 1988	Polstead Ford	13783
28.1 cm	15 Apr 1988	Scotland Street	13781
27.9 cm	15 May 2000	Stone Street	15500
27.7 cm	6 May 1994	Stone Street	13798
27 cm	15 Apr 1988	Scotland Street	13781
27 cm	26 Mar 1985	Scotland Street	13775
25.8 cm	28 Mar 1985	Polstead Ford	13777
25.6 cm	15 Apr 1988	Scotland Street	13781

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
Stour Confluence	16 Sept 1981	22 May 2026	18
Scotland Street	26 Mar 1985	21 May 2026	16
Thorington Mill	25 Mar 1985	8 May 2024	10
Peyton Hall Farm	25 Apr 1991	18 May 2018	5
Polstead Mill	27 Mar 1985	17 May 2018	9
Polstead Ford	28 Mar 1985	14 May 2018	8
Stone Street	6 May 1994	15 May 2000	3

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

1981–2026

Survey records by year

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

181

082

083

084

585

086

087

588

089

090

691

092

093

794

095

096

797

098

099

700

001

002

003

004

005

506

007

008

009

210

011

412

013

214

215

216

017

618

019

020

121

222

023

324

025

226

Fish measured by surveyors

Measured length distribution

See how the 2,294 measured fish were spread across different length ranges.

Smallest: 3.4 cm
Lower quarter: 8.6 cm
Median: 11.3 cm
Upper quarter: 14.3 cm
Largest: 29.1 cm

0–99 mm

876

100–199 mm

1301

200–299 mm

117

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 6 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: 0.4 oz (0.0122 kg)
Median: 0.5 oz (0.0155 kg)
Upper quarter: 0.7 oz (0.0202 kg)
Heaviest: 0.8 oz (0.022 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 Box (Main Reaches)

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

European eel Brown / sea trout Stone loach Dace Chub 3-spined stickleback

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 →