Flounder · Platichthys flesus

Flounder in the River South Dike FMU

Largest measured flounder: 35.6 cm

The largest flounder measured in Environment Agency surveys of the River South Dike FMU was 35.6 cm, recorded at Church Lane on 3 September 1992.

Across 35 measured flounder, the median measured length was 15.1 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 South Dike FMU.

See flounder records across England →

Most recent observation5 June 1995South Dyke Confluence · 7 fish

Largest measured flounder: 35.6 cm
Median length: 15.1 cm
Fish measured: 35
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
35.6 cm	3 Sept 1992	Church Lane	57662
34 cm	3 Sept 1992	Church Lane	57662
31.5 cm	31 Oct 1989	Grange Farm	57637
31.1 cm	3 Sept 1992	Church Lane	57662
30.6 cm	31 Oct 1989	Grange Farm	57637
29.7 cm	31 Oct 1989	Grange Farm	57637
29.5 cm	31 Oct 1989	Grange Farm	57637
29 cm	31 Oct 1989	Grange Farm	57637
28.6 cm	31 Oct 1989	Grange Farm	57637
27.7 cm	31 Oct 1989	Grange Farm	57637

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
South Dyke Confluence	3 Jul 1986	5 Jun 1995	2
Church Lane	3 Sept 1992	3 Sept 1992	1
Grange Farm	7 Jul 1986	31 Oct 1989	2

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

1986–1995

Survey records by year

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

286

087

088

189

090

091

192

093

094

195

Fish measured by surveyors

Measured length distribution

See how the 35 measured fish were spread across different length ranges.

Smallest: 9.3 cm
Lower quarter: 11.5 cm
Median: 15.1 cm
Upper quarter: 28.2 cm
Largest: 35.6 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 River South Dike FMU

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

3-spined stickleback Roach Rudd Pike Silver bream

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 →