RiverFish

Perch · Perca fluviatilis

Perch in the River Aire

Largest measured perch: 69 cm

The largest perch measured in Environment Agency surveys of the River Aire was 69 cm, recorded at Silsden Bridge on 22 July 2003.

Across 868 measured perch, the median measured length was 11.6 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 Aire.

See perch records across England →

Most recent observation14 August 2025Chapel Haddelsey - Fry Survey · 5 fish
Largest measured perch
69 cm
Median length
11.6 cm
Fish measured
868
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
69 cm22 Jul 2003Silsden Bridge78560
68.7 cm22 Jul 2003Silsden Bridge78560
65 cm22 Jul 2003Silsden Bridge78560
62.4 cm22 Jul 2003Silsden Bridge78560
47.4 cm22 Jul 2003Silsden Bridge78560
37.1 cm1 Jul 2010Castleford122800
36.2 cm5 Jul 2010Thwaite Weir122942
33.6 cm24 Jun 2011Dark Arches129821
33.5 cm24 Jun 2009Thwaite Weir117730
33.2 cm17 Jul 2006Thwaite Weir101563

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
Chapel Haddelsey - Fry Survey21 Sept 200014 Aug 20256
Thwaite Mill fry Survey8 Aug 20188 Aug 20181
Castleford Fry Survey14 Aug 201322 Aug 20172
Skelton Grange30 Sept 201330 Sept 20131
Dark Arches24 Jun 201124 Jun 20111
Thwaite Weir25 Aug 19985 Jul 201010
Castleford19 Aug 19981 Jul 201010
Chappel Haddlesey - u/s A191 Sept 199821 Jun 201010
Hirstwood, u/s Bradford Beck30 Jul 200222 Jun 20092
Fairburn25 Sept 200725 Sept 20071
Kirkstall (400m d/s weir)14 Jul 200614 Jul 20061
Swillington Bridge12 Jul 200412 Jul 20052
Thwaite Weir (Gill Net)12 Jul 200412 Jul 20041
Silsden Bridge18 Aug 199822 Jul 20032
Castleford (Gill Net)22 Aug 200222 Aug 20021
Keighley (River Worth Confluence) - Fry Survey18 Sept 199618 Sept 19961

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

1996–2025

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 868 measured fish were spread across different length ranges.

Smallest
2.8 cm
Lower quarter
8.8 cm
Median
11.6 cm
Upper quarter
15.3 cm
Largest
69 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Aire

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

Minnow Stone loach Chub Gudgeon Bullhead Brown / sea trout

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 →