RiverFish

Flounder · Platichthys flesus

Flounder in the Great Eau FMU

Largest measured flounder: 29.6 cm

The largest flounder measured in Environment Agency surveys of the Great Eau FMU was 29.6 cm, recorded at Upstream R/B Sea Doors on 6 June 1995.

Across 101 measured flounder, the median measured length was 8.6 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Great Eau FMU.

See flounder records across England →

Most recent observation1 June 2015Gayton Engine · 1 fish
Largest measured flounder
29.6 cm
Median length
8.6 cm
Fish measured
101
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
29.6 cm6 Jun 1995Upstream R/B Sea Doors57804
24.8 cm1 Jun 2015Gayton Engine144899
17 cm1 Jun 1995Cloves Bridge Upstream57801
15.4 cm9 Sept 1994Withern Road Bridge58091
14.8 cm25 Oct 1989Upstream R/B Sea Doors57776
14.2 cm25 Oct 1989Upstream R/B Sea Doors57776
12.2 cm6 Jun 1995Upstream R/B Sea Doors57804
12 cm6 Jun 1995Upstream R/B Sea Doors57804
11.7 cm27 Jun 1986Upstream R/B Sea Doors57764
11.5 cm27 Jun 1986Upstream R/B Sea Doors57764

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
Gayton Engine1 Jun 20151 Jun 20151
Cloves Bridge Upstream1 Jun 199522 Apr 20032
Upstream R/B Sea Doors27 Jun 19866 Jun 19953
Withern Road Bridge9 Sept 19949 Sept 19941

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

1986–2015

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 101 measured fish were spread across different length ranges.

Smallest
4.3 cm
Lower quarter
8.1 cm
Median
8.6 cm
Upper quarter
9.4 cm
Largest
29.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Great Eau FMU

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

European eel 3-spined stickleback Stone loach Roach Pike Dace

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 →