Roach · Rutilus rutilus

Roach in the River Cooks Backwater

Largest measured roach: 23.3 cm

The largest roach measured in Environment Agency surveys of the River Cooks Backwater was 23.3 cm, recorded at Godmanchester on 18 August 1992.

Across 290 measured roach, the median measured length was 9.3 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 Cooks Backwater.

See roach records across England →

Most recent observation9 May 2006Hartford Church · 3 fish

Largest measured roach: 23.3 cm
Median length: 9.3 cm
Fish measured: 290
Survey locations: 2

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
23.3 cm	18 Aug 1992	Godmanchester	29091
21.8 cm	18 Aug 1992	Godmanchester	29091
20.3 cm	18 Aug 1992	Godmanchester	29091
19.3 cm	18 Sept 1998	Godmanchester	29095
17.8 cm	28 Sept 1998	Hartford Church	29096
17.3 cm	18 Aug 1992	Godmanchester	29091
16.3 cm	27 Oct 1989	Godmanchester	29089
16.3 cm	26 Oct 1989	Hartford Church	29090
15.8 cm	26 Oct 1989	Hartford Church	29090
15.3 cm	4 Aug 1995	Hartford Church	29094

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
Hartford Church	26 Oct 1989	9 May 2006	5
Godmanchester	27 Oct 1989	18 Sept 1998	4

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

1989–2006

Survey records by year

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

289

090

091

292

093

094

295

096

097

298

099

000

001

002

003

004

005

106

Fish measured by surveyors

Measured length distribution

See how the 290 measured fish were spread across different length ranges.

Smallest: 3 cm
Lower quarter: 7.3 cm
Median: 9.3 cm
Upper quarter: 11.8 cm
Largest: 23.3 cm

0–99 mm

159

100–199 mm

128

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Cooks Backwater

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

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 →