RiverFish

Flounder · Platichthys flesus

Flounder in the River Rockland Broad

Largest measured flounder: 9.8 cm

The largest flounder measured in Environment Agency surveys of the River Rockland Broad was 9.8 cm, recorded at 262 on 10 July 1987.

Across 79 measured flounder, the median measured length was 4.1 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 Rockland Broad.

See flounder records across England →

Most recent observation21 August 1991262 · 5 fish
Largest measured flounder
9.8 cm
Median length
4.1 cm
Fish measured
79
Survey locations
4

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
9.8 cm10 Jul 198726217391
7.7 cm20 Aug 199126317396
6.4 cm20 Aug 199126117394
6.2 cm21 Aug 199126217395
6.2 cm20 Aug 199126317396
6 cm20 Aug 199126117394
5.9 cm20 Aug 199126317396
5.8 cm20 Aug 199126317396
5.8 cm20 Aug 199126317396
5.7 cm20 Aug 199126317396

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
26210 Jul 198721 Aug 19912
26310 Jul 198720 Aug 19912
26110 Jul 198720 Aug 19912
26010 Jul 198710 Jul 19871

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

1987–1991

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 79 measured fish were spread across different length ranges.

Smallest
2.5 cm
Lower quarter
3.5 cm
Median
4.1 cm
Upper quarter
5 cm
Largest
9.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Rockland Broad

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

Roach 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 →