Flounder · Platichthys flesus

Flounder in the River Ranworth Broad

Largest measured flounder: 21 cm

The largest flounder measured in Environment Agency surveys of the River Ranworth Broad was 21 cm, recorded at 221 on 3 September 1991.

Across 379 measured flounder, the median measured length was 6.4 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 Ranworth Broad.

See flounder records across England →

Most recent observation16 August 1999220 · 62 fish

Largest measured flounder: 21 cm
Median length: 6.4 cm
Fish measured: 379
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
21 cm	3 Sept 1991	221	17593
17.6 cm	19 Jul 1987	221	17581
17.5 cm	19 Jul 1987	222	17582
17 cm	10 Aug 1999	224	17758
16.5 cm	23 Aug 1994	224	17600
16.5 cm	19 Jul 1987	221	17581
16.3 cm	19 Jul 1987	222	17582
16 cm	20 Aug 1987	220	17580
16 cm	19 Jul 1987	221	17581
15.7 cm	19 Jul 1987	222	17582

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
220	20 Aug 1987	16 Aug 1999	4
221	19 Jul 1987	13 Aug 1999	4
225	29 Aug 1991	12 Aug 1999	3
222	19 Jul 1987	11 Aug 1999	4
224	2 Sept 1991	10 Aug 1999	3
223	21 Aug 1987	21 Aug 1987	1

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

1987–1999

Survey records by year

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

487

088

089

090

591

092

093

594

095

096

097

098

599

Fish measured by surveyors

Measured length distribution

See how the 379 measured fish were spread across different length ranges.

Smallest: 3.2 cm
Lower quarter: 5.2 cm
Median: 6.4 cm
Upper quarter: 7.3 cm
Largest: 21 cm

0–99 mm

359

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ranworth Broad

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

Perch Common bream Roach Ruffe

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 →