Flounder · Platichthys flesus

Flounder in the South Holland Main Drain

Largest measured flounder: 36.5 cm

The largest flounder measured in Environment Agency surveys of the South Holland Main Drain was 36.5 cm, recorded at Foremans Bridge on 19 June 1991.

Across 18 measured flounder, the median measured length was 24.8 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the South Holland Main Drain.

See flounder records across England →

Most recent observation28 April 2016Foremans Bridge · 3 fish

Largest measured flounder: 36.5 cm
Median length: 24.8 cm
Fish measured: 18
Survey locations: 6

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
36.5 cm	19 Jun 1991	Foremans Bridge	54697
35 cm	19 Jun 1991	Red House Bridge	54696
34.5 cm	19 Jun 1991	Foremans Bridge	54697
31 cm	19 Jun 1991	Foremans Bridge	54697
31 cm	19 Jun 1991	Red House Bridge	54696
30 cm	16 Apr 2009	Cliftons Bridge	117199
29.6 cm	6 Jun 2012	Coy Sluice	134640
28.5 cm	25 Jun 1991	Leedsgate Bridge	54694
28 cm	20 Jun 2001	Sharps Bridge (South Holland Drain)	73323
21.5 cm	21 Jun 1991	Cliftons Bridge	54695

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
Foremans Bridge	19 Jun 1991	28 Apr 2016	2
Coy Sluice	6 Jun 2012	6 Jun 2012	1
Cliftons Bridge	21 Jun 1991	16 Apr 2009	2
Sharps Bridge (South Holland Drain)	20 Jun 2001	20 Jun 2001	1
Leedsgate Bridge	25 Jun 1991	25 Jun 1991	1
Red House Bridge	19 Jun 1991	19 Jun 1991	1

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

1991–2016

Survey records by year

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

491

092

093

094

095

096

097

098

099

000

101

002

003

004

005

006

007

008

109

010

011

112

013

014

015

116

Fish measured by surveyors

Measured length distribution

See how the 18 measured fish were spread across different length ranges.

Smallest: 9.9 cm
Lower quarter: 19.9 cm
Median: 24.8 cm
Upper quarter: 30.8 cm
Largest: 36.5 cm

0–99 mm

100–199 mm

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the South Holland Main Drain

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

Roach Pike Gudgeon Common bream Perch Rudd

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 →