Flounder · Platichthys flesus

Flounder in the River Swilgate

Largest measured flounder: 28.5 cm

The largest flounder measured in Environment Agency surveys of the River Swilgate was 28.5 cm, recorded at D/s of weir (tidal) on 30 September 2005.

Across 46 measured flounder, the median measured length was 13.4 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 Swilgate.

See flounder records across England →

Most recent observation7 September 2021Rails Meadow · 1 fish

Largest measured flounder: 28.5 cm
Median length: 13.4 cm
Fish measured: 46
Survey locations: 3

Individual EA measurements

Largest measured flounder

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
28.5 cm	30 Sept 2005	D/s of weir (tidal)	86518
24 cm	15 Aug 2003	D/s of weir (tidal)	76720
22 cm	1 Aug 2012	D/s of weir (tidal)	133208
21.1 cm	11 Jun 2004	D/s of weir (tidal)	80102
21.1 cm	15 Aug 2003	D/s of weir (tidal)	76720
21 cm	20 Jan 1976	Gander Lane	76571
20.8 cm	15 Aug 2003	D/s of weir (tidal)	76720
20.4 cm	1 Aug 2012	D/s of weir (tidal)	133208
20.4 cm	11 Jun 2004	D/s of weir (tidal)	80102
20 cm	15 Aug 2003	D/s of weir (tidal)	76720

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where flounder were found

Each point marks a survey location with at least one flounder 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 flounder
Rails Meadow	7 Sept 2021	7 Sept 2021	1
D/s of weir (tidal)	15 Aug 2003	8 Aug 2014	5
Gander Lane	20 Jan 1976	20 Jan 1976	1

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

1976–2021

Survey records by year

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

176

077

078

079

080

081

082

083

084

085

086

087

088

089

090

091

092

093

094

095

096

097

098

099

000

001

002

103

104

105

006

007

008

009

010

011

112

013

114

015

016

017

018

019

020

121

Fish measured by surveyors

Measured length distribution

See how the 46 measured fish were spread across different length ranges.

Smallest: 5.2 cm
Lower quarter: 11 cm
Median: 13.5 cm
Upper quarter: 18.9 cm
Largest: 28.5 cm

0–99 mm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Swilgate

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

Dace European eel Stone loach Roach 3-spined stickleback Chub

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 →