RiverFish

Perch · Perca fluviatilis

Perch in the River Derwent (Yorkshire)

Largest measured perch: 38.7 cm

The largest perch measured in Environment Agency surveys of the River Derwent (Yorkshire) was 38.7 cm, recorded at Malton DERCORS5 on 19 September 2006.

Across 1,028 measured perch, the median measured length was 10.1 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 Derwent (Yorkshire).

See perch records across England →

Most recent observation11 August 2025Yedingham - Fry Survey · 1 fish
Largest measured perch
38.7 cm
Median length
10.1 cm
Fish measured
1,028
Survey locations
16

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
38.7 cm19 Sept 2006Malton DERCORS5107937
37.2 cm8 Sept 2000Breighton DERCORS20109935
36.4 cm21 Jun 2016Kirkham Abbey DERCORS7148271
35.9 cm24 Jul 2012Howsham DERCORS8132791
35.3 cm19 Sept 2006Malton DERCORS5107937
34.7 cm14 Sept 2007Malton DERCORS5108104
34.5 cm16 Jul 2015Howsham DERCORS8145494
34.4 cm14 Sept 2007Malton DERCORS5108104
34 cm11 Aug 2010Stamford Bridge DERCORS10124186
33.7 cm20 Sept 2006Kirkham Abbey DERCORS7107931

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
Yedingham - Fry Survey20 Sept 199911 Aug 20253
Bubwith - Fry Survey18 Sept 198419 Aug 20249
Yedingham DERCORS45 Sept 200131 Jul 20248
Sutton Upon Derwent DERCORS1826 Sept 199730 Jul 202414
Stamford Bridge DERCORS1019 Sept 199729 Jul 202415
Downstream West Ayton DERBT614 Aug 201914 Aug 20191
Malton DERCORS55 Sept 200116 Jul 20188
Kirkham Abbey DERCORS77 Sept 200116 Jul 201812
Buttercrambe DERCORS95 Sept 200228 Jun 20187
Howsham DERCORS81 Sept 200316 Jul 20158
Wheldrake Ings DERCORS1917 Sept 200119 Oct 20086
Low Hutton DERCORS67 Sept 200121 Sept 20055
Barmby on the Marsh DERCORS2123 Sept 199711 Sept 20035
Breighton DERCORS2025 Apr 199510 Sept 20036
Yedingham Fish Haven - Fry Survey18 Sept 199220 Sept 19996
Low Marishes Fish Haven - Fry Survey18 Sept 199518 Sept 19951

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

1984–2025

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 1,028 measured fish were spread across different length ranges.

Smallest
3.7 cm
Lower quarter
5.6 cm
Median
10.1 cm
Upper quarter
18 cm
Largest
38.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent (Yorkshire)

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

Minnow Bullhead Stone loach Dace European eel 3-spined stickleback

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 →