RiverFish

Flounder · Platichthys flesus

Flounder in the River Alde (Main Reaches)

Largest measured flounder: 28.2 cm

The largest flounder measured in Environment Agency surveys of the River Alde (Main Reaches) was 28.2 cm, recorded at Upstream Blaxhall Railway Bridge on 19 June 1991.

Across 140 measured flounder, the median measured length was 13.7 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 Alde (Main Reaches).

See flounder records across England →

Most recent observation14 July 2010Upstream Langham Bridge · 1 fish
Largest measured flounder
28.2 cm
Median length
13.7 cm
Fish measured
140
Survey locations
3

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
28.2 cm19 Jun 1991Upstream Blaxhall Railway Bridge4040
27.9 cm2 Jul 1991Upstream Langham Bridge4041
27 cm19 Jun 1991Upstream Blaxhall Railway Bridge4040
26.8 cm19 Jun 1991Upstream Blaxhall Railway Bridge4040
21.7 cm19 Jun 1991Upstream Blaxhall Railway Bridge4040
21 cm6 Nov 1987Upstream Langham Bridge4036
20.9 cm19 Jun 1991Upstream Blaxhall Railway Bridge4040
20.9 cm5 Nov 1987Upstream Blaxhall Railway Bridge4035
19.7 cm4 Aug 1994Upstream Langham Bridge4046
19.2 cm4 Aug 1994Upstream Langham Bridge4046

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
Upstream Langham Bridge6 Nov 198714 Jul 20106
Upstream Blaxhall Railway Bridge5 Nov 198720 Jun 19954
Downstream Langham Bridge12 Jun 199512 Jun 19951

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

1987–2010

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 140 measured fish were spread across different length ranges.

Smallest
5.8 cm
Lower quarter
11 cm
Median
13.7 cm
Upper quarter
15.4 cm
Largest
28.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Alde (Main Reaches)

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

European eel Dace Roach Stone loach 3-spined stickleback Chub

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 →