Perch · Perca fluviatilis

Perch in the River Derwent

Largest measured perch: 43.3 cm

The largest perch measured in Environment Agency surveys of the River Derwent was 43.3 cm, recorded at Nooning Lane on 17 September 2014.

Across 338 measured perch, the median measured length was 20.4 cm.

Surveyors recorded weights for 4 perch. The median was 1 lb 10.6 oz (0.755 kg) and the largest recorded weight was 4 lb 1.4 oz (1.86 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 Derwent.

See perch records across England →

Most recent observation22 September 2025Derby Triangle Net · 1 fish

Largest measured perch: 43.3 cm
Median length: 20.4 cm
Fish measured: 338
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.

Length	Survey date	Survey location	Survey ID
43.3 cm	17 Sept 2014	Nooning Lane	142947
42 cm	1 Jul 2010	Chub Alley	122580
40.5 cm	16 Sept 2016	Borrowash Fish Pass Pool1	149408
40.5 cm	3 Aug 2012	Chub Alley	134941
40 cm	5 Oct 2008	Church Wilne	115109
38.9 cm	25 Sept 2015	Borrowash Black Weir	147607
38.5 cm	6 Sept 2009	Borrowash	119552
38.3 cm	5 Oct 2008	Church Wilne	115109
38.3 cm	9 Sept 2007	Duffield	107979
38.2 cm	16 Oct 2005	Borrowash	87985

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 surveyed	First recorded	Last recorded	Visits finding perch
Derby Triangle Net	22 Sept 2025	22 Sept 2025	1
Cromford	26 Feb 1998	6 Sept 2018	11
Nooning Lane	28 Jul 2009	25 Jul 2017	4
Chub Alley	1 Jul 2010	25 Jul 2017	4
Borrowash Fish Pass Pool1	16 Sept 2016	16 Sept 2016	1
Borrowash Black Weir	25 Sept 2015	25 Sept 2015	1
Chub Alley Net	3 Aug 2012	3 Aug 2012	1
Nooning Lane Net	26 Jul 2012	26 Jul 2012	1
Borrowash	14 Oct 2001	6 Sept 2009	7
Church Wilne	29 Aug 1994	5 Oct 2008	7
Duffield	10 Feb 1998	9 Sept 2007	3
Matlock Bath	29 Apr 1993	5 Sept 2004	3
Ambergate	5 May 1993	5 May 1993	1
Alvaston	22 Apr 1993	22 Apr 1993	1

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

1993–2025

Survey records by year

Each bar shows how many survey visits recorded perch that year.

393

194

095

096

097

398

099

000

401

302

003

304

305

206

307

308

309

210

011

312

113

214

115

216

217

118

019

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 338 measured fish were spread across different length ranges.

Smallest: 3.8 cm
Lower quarter: 14.7 cm
Median: 20.5 cm
Upper quarter: 30.9 cm
Largest: 43.3 cm

0–99 mm

100–199 mm

150

200–299 mm

300–399 mm

400–499 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 4 perch. This is a subset of the measured fish and may not represent the whole population.

Lightest: 1 lb 0.9 oz (0.48 kg)
Lower quarter: 1 lb 4.6 oz (0.585 kg)
Median: 1 lb 10.6 oz (0.755 kg)
Upper quarter: 2 lb 7.9 oz (1.13 kg)
Heaviest: 4 lb 1.4 oz (1.86 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 Derwent

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

Brown / sea trout Bullhead Minnow Grayling Chub Stone loach

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 →