Flounder · Platichthys flesus

Flounder in the River Thurne (Seine)

Largest measured flounder: 17.3 cm

The largest flounder measured in Environment Agency surveys of the River Thurne (Seine) was 17.3 cm, recorded at Upstream Candle Dyke on 23 August 1986.

Across 482 measured flounder, the median measured length was 6 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 Thurne (Seine).

See flounder records across England →

Most recent observation15 October 1998Downstream Womack Water · 1 fish

Largest measured flounder: 17.3 cm
Median length: 6 cm
Fish measured: 482
Survey locations: 7

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
17.3 cm	23 Aug 1986	Upstream Candle Dyke	16885
16.8 cm	8 Sept 1986	Upstream Martham Ferry	16884
16 cm	23 Aug 1986	Upstream Candle Dyke	16885
15.8 cm	5 Oct 1993	Upstream Martham Ferry	16903
15.3 cm	7 Oct 1993	Upstream Potter Bridge	16905
15.1 cm	8 Sept 1986	Upstream Martham Ferry	16884
15 cm	18 Aug 1986	Downstream Womack Water	16889
14.8 cm	18 Aug 1986	Downstream Womack Water	16889
14.6 cm	24 Aug 1986	Downstream Potter Bridge	16887
14.2 cm	16 Jul 1998	Upstream Candle Dyke	16910

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
Downstream Womack Water	18 Aug 1986	15 Oct 1998	2
Upstream Candle Dyke	23 Aug 1986	16 Jul 1998	4
Upstream Potter Bridge	21 Aug 1986	7 Oct 1993	2
Upstream Martham Ferry	8 Sept 1986	5 Oct 1993	2
Downstream Repps Staithe	21 Aug 1986	17 Oct 1989	2
Downstream Potter Bridge	24 Aug 1986	24 Aug 1986	1
Upstream Thurne Lion Dyke	22 Aug 1986	22 Aug 1986	1

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

1986–1998

Survey records by year

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

786

087

088

289

090

091

092

393

094

095

096

097

298

Fish measured by surveyors

Measured length distribution

See how the 482 measured fish were spread across different length ranges.

Smallest: 3.2 cm
Lower quarter: 5 cm
Median: 6 cm
Upper quarter: 6.9 cm
Largest: 17.3 cm

0–99 mm

453

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thurne (Seine)

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

Roach Perch Common bream Smelt 3-spined stickleback 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 →