Perch · Perca fluviatilis

Perch in the River Upper Ouse

Largest measured perch: 42.3 cm

The largest perch measured in Environment Agency surveys of the River Upper Ouse was 42.3 cm, recorded at Passenham on 16 August 2001.

Across 5,277 measured perch, the median measured length was 12.3 cm.

Surveyors recorded weights for 5 perch. The median was 2 lb 0.1 oz (0.91 kg) and the largest recorded weight was 2 lb 16 oz (1.36 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 Upper Ouse.

See perch records across England →

Most recent observation21 April 2026DS Wolverton Mill · 25 fish

Largest measured perch: 42.3 cm
Median length: 12.3 cm
Fish measured: 5,277
Survey locations: 46

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
42.3 cm	16 Aug 2001	Passenham	30805
41.8 cm	15 Aug 2023	DS Ravenstone Mill	163002
41.8 cm	27 Apr 1994	Old Stratford	28857
38.9 cm	5 Sept 2017	Kempston Mill	151534
38.8 cm	14 Apr 1997	Old Mill House Buckingham	28866
38.5 cm	18 May 2006	Mount Mill Farm	90768
38.2 cm	17 Jun 2025	Manor Farm Cosgrove	177135
37.8 cm	27 Apr 1994	Old Stratford	28857
37.5 cm	28 Jun 2002	Mount Mill Farm	52002
37.3 cm	14 Aug 2001	Mount Mill Farm	30804

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
DS Wolverton Mill	20 Aug 2013	21 Apr 2026	4
Manor Farm Cosgrove	8 Jul 1988	17 Jun 2025	9
Passenham	14 Jul 1988	12 Jun 2025	18
Thornborough Mill	10 Aug 1988	5 Jun 2025	13
Westbury	30 Sept 2008	9 Jul 2024	5
Mill Farm	30 Jun 1988	26 Jun 2024	9
Buckingham	23 Jun 1988	18 Jun 2024	16
Brackley	30 Sept 2008	4 Jun 2024	7
Kempston Mill	25 Nov 1988	31 Aug 2023	7
Oakley	23 Nov 1988	30 Aug 2023	13
Odell	21 Nov 1988	23 Aug 2023	12
Turvey	18 Nov 1988	22 Aug 2023	13
Clifton Reynes	16 Nov 1988	16 Aug 2023	14
DS Ravenstone Mill	8 Sept 2014	15 Aug 2023	3
Mill Farm Gayhurst	2 Aug 1988	19 Aug 2019	13
Newport Pagnell	15 Nov 1988	4 Sept 2017	15
Water Stratford	8 Aug 2012	8 Sept 2016	2
Stony Stratford Bypass Channel	30 Jun 2016	30 Jun 2016	1
Old Stratford	27 Jun 1988	30 Jul 2013	6
Lavendon Mill	13 Oct 1988	2 Sept 2011	5
Pavenham	11 Nov 1988	17 Aug 2010	8
Ravenstone Mill	1 Nov 1988	5 Aug 2010	9
Radwell / Bletsoe	20 Oct 1988	4 Aug 2010	12
Wolverton Mill	5 Aug 1988	29 Jun 2010	14
Mount Mill Farm	9 Aug 1988	3 Jun 2010	13
Whitfield	1 Oct 2008	1 Oct 2008	1
Turweston	1 Oct 2008	1 Oct 2008	1
Haversham Weir	20 Jul 1988	25 Apr 2008	5
DS Passenham Weir	15 Jul 1988	17 Apr 2008	6
Milton Ernest STW	7 Sept 2004	7 Sept 2004	1
Falcon Inn Bletsoe	6 Sept 2004	6 Sept 2004	1
Stoke Mill Sharnbrook	3 Sept 2004	3 Sept 2004	1
Stony Stratford	1 Nov 2001	1 Nov 2001	1
Emberton Park	24 Nov 1988	24 Aug 2001	5
Biddenham	29 Nov 1988	17 Nov 1997	4
Harrold Country Park	14 Nov 1988	14 Nov 1997	4
Queens Park Bedford	2 Mar 1992	5 Nov 1997	3
Clapham	28 Oct 1988	27 Oct 1997	4
Sherrington	26 Oct 1988	23 Oct 1997	4
Felmersham	19 Oct 1988	20 Oct 1997	4
Carlton	18 Oct 1988	17 Oct 1997	4
Newton Blossomville	17 Oct 1988	8 Oct 1997	4
Radclive Mill	27 Mar 1991	30 Apr 1997	3
US Mill Farm	28 Jun 1988	17 Apr 1997	4
Old Mill House Buckingham	24 Jun 1988	14 Apr 1997	4
Milton Ernest	22 Nov 1988	19 Oct 1994	3

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

1988–2026

Survey records by year

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

3288

089

090

2291

992

293

3494

095

096

2897

098

099

000

1001

502

903

1904

805

806

1307

2108

1209

1310

811

212

913

614

015

1116

717

118

319

020

021

222

623

424

325

126

Fish measured by surveyors

Measured length distribution

See how the 5,277 measured fish were spread across different length ranges.

Smallest: 2 cm
Lower quarter: 10.3 cm
Median: 12.3 cm
Upper quarter: 15.8 cm
Largest: 42.3 cm

0–99 mm

1187

100–199 mm

3404

200–299 mm

583

300–399 mm

100

400–499 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 5 perch. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.0009 kg)
Lower quarter: 0 oz (0.0011 kg)
Median: 2 lb 0.1 oz (0.91 kg)
Upper quarter: 2 lb 5 oz (1.05 kg)
Heaviest: 2 lb 16 oz (1.36 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 Upper Ouse

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

Pike Dace Roach Chub Gudgeon Common bream

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 →