RiverFish

Flounder · Platichthys flesus

Flounder in the River Middle Ouse

Largest measured flounder: 31.3 cm

The largest flounder measured in Environment Agency surveys of the River Middle Ouse was 31.3 cm, recorded at St Ives on 26 October 1989.

Across 72 measured flounder, the median measured length was 5.3 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 Middle Ouse.

See flounder records across England →

Most recent observation9 November 2007Holywell · 1 fish
Largest measured flounder
31.3 cm
Median length
5.3 cm
Fish measured
72
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
31.3 cm26 Oct 1989St Ives29197
30.3 cm15 Aug 1995St Ives29210
29.8 cm26 Oct 1989St Ives29197
25.3 cm26 Oct 1989St Ives29197
24.3 cm11 Sept 1992St Ives29203
17.3 cm17 Sept 1992Earith29209
17.3 cm26 Oct 1989St Ives29197
16.3 cm4 Oct 1995Earith29216
13.8 cm2 Oct 1995Bluntisham29215
13.8 cm16 Aug 1995Meadow Lane St Ives29211

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
Holywell9 Nov 20079 Nov 20071
Bluntisham10 Nov 19896 Aug 19994
Earith17 Sept 19924 Oct 19952
Meadow Lane St Ives16 Aug 199516 Aug 19951
St Ives26 Oct 198915 Aug 19953
Pike & Eel8 Nov 19898 Nov 19891

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

1989–2007

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 72 measured fish were spread across different length ranges.

Smallest
3.3 cm
Lower quarter
4.8 cm
Median
5.3 cm
Upper quarter
6.3 cm
Largest
31.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Middle Ouse

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

Perch Roach Pike Bleak Gudgeon Common bream

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 →