Flounder · Platichthys flesus

Flounder in the Relief Channel

Largest measured flounder: 36.8 cm

The largest flounder measured in Environment Agency surveys of the Relief Channel was 36.8 cm, recorded at Wiggenhall Bridge on 15 September 1993.

Across 221 measured flounder, the median measured length was 9.3 cm.

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

See flounder records across England →

Most recent observation24 August 2005Tail Sluice · 4 fish

Largest measured flounder: 36.8 cm
Median length: 9.3 cm
Fish measured: 221
Survey locations: 12

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
36.8 cm	15 Sept 1993	Wiggenhall Bridge	30273
36.3 cm	15 Sept 1993	Wiggenhall Bridge	30273
36.3 cm	10 Oct 1991	Wiggenhall Bridge	30261
35.8 cm	13 Sept 1993	Magdalen Bridge	30271
35.3 cm	16 Sept 1993	Saddlebow Bridge	30274
35.3 cm	3 Oct 1991	DS Stow Bridge	30257
34.3 cm	4 Oct 1991	Holme Farm Magdalen	30258
33.8 cm	13 Sept 1993	Magdalen Bridge	30271
33.8 cm	6 Sept 1993	Downham Market STW	30267
33.8 cm	1 Oct 1991	Downham Market STW	30255

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
Tail Sluice	15 Oct 1991	24 Aug 2005	4
Saddlebow Bridge	27 Sept 1988	23 Aug 2005	4
Wiggenhall Bridge	10 Oct 1991	22 Aug 2005	4
Magdalen Bridge	8 Oct 1991	16 Aug 2005	3
Denver Sluice	5 Sept 1988	4 Aug 2005	3
Polver Farm Magdalen	9 Oct 1991	20 Sept 2000	3
Holme Farm Magdalen	4 Oct 1991	4 Sept 2000	3
DS Stow Bridge	8 Sept 1988	1 Sept 2000	5
Stow Bridge	31 Aug 2000	31 Aug 2000	1
Downham Bridge	2 Sept 1993	22 Aug 2000	2
Downham Market STW	7 Sept 1988	17 Sept 1996	4
DS Downham Bridge	30 Sept 1991	3 Sept 1993	2

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

1988–2005

Survey records by year

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

488

089

090

991

092

1093

094

095

296

097

098

099

700

001

002

003

004

605

Fish measured by surveyors

Measured length distribution

See how the 221 measured fish were spread across different length ranges.

Smallest: 3 cm
Lower quarter: 7.8 cm
Median: 9.3 cm
Upper quarter: 18.8 cm
Largest: 36.8 cm

0–99 mm

122

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 Relief Channel

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

Perch Roach Ruffe Zander Pike European eel

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 →