RiverFish

Roach · Rutilus rutilus

Roach in the River Brett (Main Reaches)

Largest measured roach: 33.2 cm

The largest roach measured in Environment Agency surveys of the River Brett (Main Reaches) was 33.2 cm, recorded at Waterhouse Farm on 31 March 1994.

Across 12,601 measured roach, the median measured length was 11.8 cm.

Surveyors recorded weights for 2 roach. The median was 1 oz (0.0285 kg) and the largest recorded weight was 1.1 oz (0.031 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 Brett (Main Reaches).

See roach records across England →

Most recent observation9 April 2026Waterhouse Farm · 5 fish
Largest measured roach
33.2 cm
Median length
11.8 cm
Fish measured
12,601
Survey locations
14

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
33.2 cm31 Mar 1994Waterhouse Farm13752
32.7 cm12 Feb 1982Bridge Farm Chelsworth81807
32 cm26 Mar 1991Peyton Hall13743
31.5 cm26 Mar 1991Peyton Hall13743
31.5 cm21 Mar 1991Semer A13746
31.5 cm26 Feb 1988Cherry Hill13733
31.4 cm12 Apr 2006Cosford Bridge90662
31.2 cm19 Apr 2006Cobbolds Mill90661
31.2 cm26 Mar 1991Peyton Hall13743
31.2 cm19 Feb 1982Peyton Hall81796

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
Waterhouse Farm18 Mar 19829 Apr 202616
Higham FGS20 Nov 19847 Apr 202614
Hadleigh Town6 Feb 198526 Apr 202410
Chelsworth11 Mar 198826 Apr 20188
Cobbolds Mill20 Mar 198516 Apr 20189
Cosford Bridge25 Mar 199413 Apr 20184
Hadleigh STW7 Jan 198530 Sept 20138
Semer A16 Feb 198225 Sept 20139
Cherry Hill26 Feb 198820 Apr 20066
Peyton Hall19 Feb 198210 Apr 20068
Downstream Mill Farm8 Mar 19855 Apr 20065
Upstream Mill Farm24 Mar 198229 Mar 20064
Semer B (Dairy Farm - River Brett)17 Feb 198213 Dec 19842
Bridge Farm Chelsworth12 Feb 198212 Feb 19821

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

1982–2026

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 12,601 measured fish were spread across different length ranges.

Smallest
2.2 cm
Lower quarter
7.6 cm
Median
11.8 cm
Upper quarter
16.6 cm
Largest
33.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 2 roach. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.9 oz (0.026 kg)
Lower quarter
1 oz (0.0272 kg)
Median
1 oz (0.0285 kg)
Upper quarter
1.1 oz (0.0298 kg)
Heaviest
1.1 oz (0.031 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 Brett (Main Reaches)

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

European eel Pike Gudgeon Dace Perch Bullhead

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 →