RiverFish

Roach · Rutilus rutilus

Roach in the Alconbury Brook

Largest measured roach: 26.3 cm

The largest roach measured in Environment Agency surveys of the Alconbury Brook was 26.3 cm, recorded at Brampton Racecourse on 16 October 1989.

Across 1,217 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 Alconbury Brook.

See roach records across England →

Most recent observation27 May 2015Brampton Racecourse · 36 fish
Largest measured roach
26.3 cm
Median length
9.3 cm
Fish measured
1,217
Survey locations
4

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
26.3 cm16 Oct 1989Brampton Racecourse29068
24.8 cm3 Oct 1989DS A1 Lay-by29067
24.3 cm3 Oct 1989DS A1 Lay-by29067
23.8 cm6 Oct 1989Alconbury Village29066
23.3 cm15 Dec 1995DS A1 Lay-by29075
23.3 cm16 Oct 1989Brampton Racecourse29068
23.3 cm3 Oct 1989DS A1 Lay-by29067
23.3 cm3 Oct 1989DS A1 Lay-by29067
22.8 cm15 Dec 1995DS A1 Lay-by29075
22.8 cm1 Nov 1989Hinchingbrooke29069

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
Brampton Racecourse16 Oct 198927 May 20156
Alconbury Village6 Oct 198922 May 20155
DS A1 Lay-by3 Oct 198924 Jun 19984
Hinchingbrooke1 Nov 198927 Sept 19953

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

1989–2015

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 1,217 measured fish were spread across different length ranges.

Smallest
3.3 cm
Lower quarter
6.3 cm
Median
9.3 cm
Upper quarter
13.3 cm
Largest
26.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Alconbury Brook

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

Pike European eel Perch Chub Dace 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 →