Flounder · Platichthys flesus

Flounder in the River Fynn

Largest measured flounder: 16.5 cm

The largest flounder measured in Environment Agency surveys of the River Fynn was 16.5 cm, recorded at Special Survey MB on 10 October 2008.

Across 74 measured flounder, the median measured length was 6.7 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 Fynn.

See flounder records across England →

Most recent observation7 March 2017Martlesham Bridge · 2 fish

Largest measured flounder: 16.5 cm
Median length: 6.7 cm
Fish measured: 74
Survey locations: 2

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
16.5 cm	10 Oct 2008	Special Survey MB	115812
11.1 cm	10 Oct 2008	Special Survey MB	115812
10.9 cm	7 Apr 1998	Martlesham Bridge	13456
10.3 cm	10 Oct 2008	Special Survey MB	115812
9.9 cm	10 Oct 2008	Special Survey MB	115812
9.8 cm	7 Apr 1998	Martlesham Bridge	13456
9.3 cm	10 Oct 2008	Special Survey MB	115812
9.2 cm	10 Oct 2008	Special Survey MB	115812
9.1 cm	4 Feb 2011	Martlesham Bridge	125901
9.1 cm	10 Oct 2008	Special Survey MB	115812

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
Martlesham Bridge	7 Apr 1998	7 Mar 2017	4
Special Survey MB	10 Oct 2008	10 Oct 2008	1

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

1998–2017

Survey records by year

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

198

099

000

001

002

003

004

005

106

007

108

009

010

111

012

013

014

015

016

117

Fish measured by surveyors

Measured length distribution

See how the 74 measured fish were spread across different length ranges.

Smallest: 2.8 cm
Lower quarter: 6 cm
Median: 6.7 cm
Upper quarter: 7.9 cm
Largest: 16.5 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Fynn

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

3-spined stickleback Stone loach European eel 10-spined stickleback 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 →