RiverFish

Rudd · Scardinius erythrophthalmus

Rudd in the River Box (Main Reaches)

Largest measured rudd: 20 cm

The largest rudd measured in Environment Agency surveys of the River Box (Main Reaches) was 20 cm, recorded at Scotland Street on 7 May 1997.

Across 388 measured rudd, the median measured length was 9 cm.

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 rudd records across England →

Most recent observation21 May 2026Scotland Street · 13 fish
Largest measured rudd
20 cm
Median length
9 cm
Fish measured
388
Survey locations
7

Individual EA measurements

Largest measured rudd

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
20 cm7 May 1997Scotland Street13801
19.2 cm8 May 2024Thorington Mill165730
19 cm26 Mar 1985Scotland Street13775
19 cm26 Mar 1985Scotland Street13775
18.9 cm13 May 2024Stour Confluence165729
18.6 cm8 May 2024Thorington Mill165730
18.3 cm8 May 2024Thorington Mill165730
18.1 cm13 Apr 2000Thorington Mill15495
17.9 cm13 Apr 2000Thorington Mill15495
17.5 cm17 May 2024Scotland Street165731

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where rudd were found

Each point marks a survey location with at least one rudd 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 rudd
Scotland Street26 Mar 198521 May 202612
Polstead Mill27 Mar 198511 Jun 20248
Stour Confluence15 May 200613 May 20243
Thorington Mill25 Mar 19858 May 20246
Peyton Hall Farm5 May 19945 May 20155
Polstead Ford4 May 199416 May 20124
Stone Street6 May 19948 May 20123

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

1985–2026

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 388 measured fish were spread across different length ranges.

Smallest
2.6 cm
Lower quarter
6.1 cm
Median
9 cm
Upper quarter
11.9 cm
Largest
20 cm

Lengths are direct survey measurements rather than anglers’ catches.

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 Roach Chub

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 →