RiverFish

Roach · Rutilus rutilus

Roach in the River Desborough Island

Largest measured roach: 19.1 cm

The largest roach measured in Environment Agency surveys of the River Desborough Island was 19.1 cm, recorded at Desborough Island Downstream Fry on 22 September 2006.

Across 1,892 measured roach, the median measured length was 4.3 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 Desborough Island.

See roach records across England →

Most recent observation3 September 2025Desborough Island Upstream Fry · 256 fish
Largest measured roach
19.1 cm
Median length
4.3 cm
Fish measured
1,892
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.

LengthSurvey dateSurvey locationSurvey ID
19.1 cm22 Sept 2006Desborough Island Downstream Fry111970
18.5 cm22 Sept 2006Desborough Island Downstream Fry111970
17.6 cm21 Aug 2018Desborough Island Downstream Fry153444
16.7 cm21 Aug 2018Desborough Island Downstream Fry153444
16.6 cm21 Aug 2018Desborough Island Downstream Fry153444
15.6 cm22 Sept 2006Desborough Island Downstream Fry111970
15.4 cm22 Sept 2006Desborough Island Downstream Fry111970
15.4 cm22 Sept 2006Desborough Island Downstream Fry111970
15.4 cm22 Sept 2006Desborough Island Downstream Fry111970
15.1 cm26 Aug 2016Desborough Island Downstream Fry149240

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
Desborough Island Upstream Fry10 Sept 20043 Sept 202518
Desborough Island Downstream Fry10 Sept 20043 Sept 202518
Desborough Island 10C22 Aug 200722 Aug 20071

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

2004–2025

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 1,892 measured fish were spread across different length ranges.

Smallest
1.5 cm
Lower quarter
3.6 cm
Median
4.3 cm
Upper quarter
6.4 cm
Largest
19.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Desborough Island

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

Perch Dace Chub Bleak Ruffe Gudgeon

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 →