RiverFish

Perch · Perca fluviatilis

Perch in the River Desborough Island

Largest measured perch: 21.4 cm

The largest perch measured in Environment Agency surveys of the River Desborough Island was 21.4 cm, recorded at Desborough Island Downstream Fry on 19 August 2010.

Across 504 measured perch, the median measured length was 5.5 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 Desborough Island.

See perch records across England →

Most recent observation3 September 2025Desborough Island Upstream Fry · 4 fish
Largest measured perch
21.4 cm
Median length
5.5 cm
Fish measured
504
Survey locations
3

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
21.4 cm19 Aug 2010Desborough Island Downstream Fry124878
13.5 cm22 Sept 2006Desborough Island Downstream Fry111970
13.2 cm22 Aug 2007Desborough Island Downstream Fry108633
12.8 cm22 Aug 2006Desborough Island Upstream Fry111973
12.7 cm26 Aug 2016Desborough Island Downstream Fry149240
12.6 cm22 Aug 2007Desborough Island Downstream Fry108633
12.5 cm30 Aug 2023Desborough Island Downstream Fry164291
12 cm21 Aug 2018Desborough Island Downstream Fry153444
11.5 cm20 Aug 2009Desborough Island Upstream Fry120816
11.4 cm21 Aug 2018Desborough Island Downstream Fry153444

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
Desborough Island Upstream Fry10 Sept 20043 Sept 202518
Desborough Island Downstream Fry10 Sept 20043 Sept 202516
Desborough Island 10C22 Aug 200722 Aug 20071

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

2004–2025

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 504 measured fish were spread across different length ranges.

Smallest
3.3 cm
Lower quarter
4.9 cm
Median
5.5 cm
Upper quarter
6.3 cm
Largest
21.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Desborough Island

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

Roach Dace Chub Bleak Ruffe 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 →