RiverFish

Perch · Perca fluviatilis

Perch in the River Blackwater

Largest measured perch: 37.9 cm

The largest perch measured in Environment Agency surveys of the River Blackwater was 37.9 cm, recorded at Eversley Cross on 9 April 2002.

Across 2,927 measured perch, the median measured length was 11.7 cm.

Surveyors recorded weights for 27 perch. The median was 1.5 oz (0.042 kg) and the largest recorded weight was 4.8 oz (0.135 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 Blackwater.

See perch records across England →

Most recent observation6 May 2026Coleford Bridge · 7 fish
Largest measured perch
37.9 cm
Median length
11.7 cm
Fish measured
2,927
Survey locations
17

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
37.9 cm9 Apr 2002Eversley Cross50341
37.2 cm1 Apr 2003Eversley Cross75788
37 cm8 Apr 2004Eversley Cross79772
33.6 cm15 Apr 2010Eversley Cross121386
32.1 cm9 Apr 2002Hawley Meadows50240
32 cm26 Mar 2003Hawley Meadows75778
31.5 cm19 Apr 2016Coleford Bridge147951
30.8 cm1 Apr 2003Eversley Cross75788
30.8 cm27 Mar 2003Owlsmoor75779
30 cm8 Apr 2004Eversley Cross79772

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
Coleford Bridge21 Mar 20036 May 20265
Hawley Meadows5 Dec 199010 Apr 202517
Riseley4 Apr 20028 Apr 202511
Manor Farm Nature reserve8 Apr 20258 Apr 20251
Downstream Riseley5 Feb 199118 May 20163
Eversley Cross7 Dec 199010 Apr 20139
Aldershot Park7 May 20107 May 20101
Hollybush Lane16 Apr 200316 Apr 20031
Aldershot9 Apr 20039 Apr 20031
Church Farm3 Apr 20033 Apr 20031
Owlsmoor6 Dec 199027 Mar 20032
Greenacres29 Jan 199129 Jan 19911
RAE Riseley23 Jan 199123 Jan 19911
Downstream Sandhurst Lane18 Dec 199018 Dec 19901
Upstream Cove Brook3 Dec 19903 Dec 19901
Upstream A325 Frimley30 Nov 199030 Nov 19901
Grove Farm23 Nov 199023 Nov 19901

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

1990–2026

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 2,927 measured fish were spread across different length ranges.

Smallest
4.8 cm
Lower quarter
8.5 cm
Median
11.7 cm
Upper quarter
14.3 cm
Largest
37.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 27 perch. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.6 oz (0.017 kg)
Lower quarter
0.9 oz (0.0255 kg)
Median
1.5 oz (0.042 kg)
Upper quarter
2 oz (0.0565 kg)
Heaviest
4.8 oz (0.135 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 Blackwater

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

Roach Chub Gudgeon Pike Dace Tench

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 →