RiverFish

Perch · Perca fluviatilis

Perch in the River Brett (Main Reaches)

Largest measured perch: 51 cm

The largest perch measured in Environment Agency surveys of the River Brett (Main Reaches) was 51 cm, recorded at Semer A on 14 December 1984.

Across 1,685 measured perch, the median measured length was 12 cm.

Surveyors recorded weights for 20 perch. The median was 1.3 oz (0.0365 kg) and the largest recorded weight was 15.8 oz (0.447 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 perch records across England →

Most recent observation7 April 2026Higham FGS · 22 fish
Largest measured perch
51 cm
Median length
12 cm
Fish measured
1,685
Survey locations
14

Individual EA measurements

Largest measured perch

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

LengthSurvey dateSurvey locationSurvey ID
51 cm14 Dec 1984Semer A13723
35.5 cm4 Apr 2000Semer A15491
34.1 cm19 Apr 2006Cobbolds Mill90661
33.7 cm21 Mar 1991Semer A13746
33.1 cm6 Apr 2000Chelsworth15492
32.8 cm11 Apr 2006Semer A90605
32.5 cm23 Feb 1988Semer A13734
32.1 cm4 Apr 2000Semer A15491
32 cm21 Mar 1991Semer A13746
32 cm20 Mar 1991Chelsworth13747

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

Explore the river

Where perch were found

Each point marks a survey location with at least one perch 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 perch
Higham FGS1 Apr 19827 Apr 202616
Hadleigh Town9 Mar 198226 Apr 202411
Cosford Bridge17 Feb 198213 Apr 20188
Waterhouse Farm18 Mar 198211 Apr 20147
Hadleigh STW16 Mar 198230 Sept 20138
Cherry Hill22 Mar 199120 Apr 20065
Cobbolds Mill19 Apr 200619 Apr 20061
Chelsworth20 Mar 199113 Apr 20065
Semer A16 Feb 198211 Apr 20067
Peyton Hall19 Feb 198210 Apr 20066
Downstream Mill Farm25 Mar 19825 Apr 20067
Upstream Mill Farm24 Mar 198229 Mar 20066
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 perch that year.

Fish measured by surveyors

Measured length distribution

See how the 1,685 measured fish were spread across different length ranges.

Smallest
4.5 cm
Lower quarter
10 cm
Median
12 cm
Upper quarter
15.1 cm
Largest
51 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 20 perch. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.3 oz (0.009 kg)
Lower quarter
0.8 oz (0.0225 kg)
Median
1.3 oz (0.0365 kg)
Upper quarter
4.8 oz (0.1348 kg)
Heaviest
15.8 oz (0.447 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 Roach Gudgeon Dace 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 →