RiverFish

Flounder · Platichthys flesus

Flounder in the River South Walsham Broad

Largest measured flounder: 24.2 cm

The largest flounder measured in Environment Agency surveys of the River South Walsham Broad was 24.2 cm, recorded at 235 on 13 September 1990.

Across 131 measured flounder, the median measured length was 7.6 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 South Walsham Broad.

See flounder records across England →

Most recent observation24 August 1999232 · 26 fish
Largest measured flounder
24.2 cm
Median length
7.6 cm
Fish measured
131
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.

LengthSurvey dateSurvey locationSurvey ID
24.2 cm13 Sept 199023517622
20.5 cm13 Sept 199023717623
18.6 cm4 Aug 198723417617
17.8 cm5 Aug 198723317616
17.6 cm5 Aug 198723317616
17.3 cm6 Aug 198723617619
16.7 cm4 Aug 198723417617
16 cm4 Aug 198723417617
15.4 cm5 Aug 198723317616
15.2 cm4 Aug 198723417617

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 surveyedFirst recordedLast recordedVisits finding flounder
2325 Aug 198724 Aug 19992
2344 Aug 198723 Aug 19994
2376 Aug 198717 Aug 19994
2356 Aug 198731 Aug 19943
2366 Aug 19876 Aug 19871
2335 Aug 19875 Aug 19871

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.

Fish measured by surveyors

Measured length distribution

See how the 131 measured fish were spread across different length ranges.

Smallest
3 cm
Lower quarter
6.1 cm
Median
7.6 cm
Upper quarter
12.6 cm
Largest
24.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River South Walsham Broad

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

Roach Common bream Perch Ruffe Pike Smelt

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 →