RiverFish

Flounder · Platichthys flesus

Flounder in the River Stiffkey

Largest measured flounder: 32.5 cm

The largest flounder measured in Environment Agency surveys of the River Stiffkey was 32.5 cm, recorded at Upstream Home Farm on 10 June 2008.

Across 58 measured flounder, the median measured length was 17.4 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 Stiffkey.

See flounder records across England →

Most recent observation1 May 2026Upstream Home Farm · 2 fish
Largest measured flounder
32.5 cm
Median length
17.4 cm
Fish measured
58
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
32.5 cm10 Jun 2008Upstream Home Farm111299
31.4 cm3 May 2000Warham18707
31.2 cm17 Oct 2009Warham119585
29.2 cm26 Apr 1995Upstream Home Farm16878
28 cm10 Jun 2008Upstream Home Farm111299
27.5 cm16 Sept 2009Upstream Home Farm119565
25.6 cm2 Apr 1995Warham16877
25.2 cm2 Apr 1995Warham16877
24.3 cm26 Apr 1995Upstream Home Farm16878
24 cm2 Apr 1995Warham16877

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 Home Farm21 Apr 19881 May 20267
Warham2 Apr 199522 Apr 20265
Cockthorpe Common23 Apr 19886 Apr 20004
Downstream Wighton Bridge27 Apr 199527 Apr 19951

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

1988–2026

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 58 measured fish were spread across different length ranges.

Smallest
4.2 cm
Lower quarter
13 cm
Median
17.4 cm
Upper quarter
22.7 cm
Largest
32.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Stiffkey

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

Brown / sea trout Bullhead European eel Stone loach 3-spined stickleback Brook lamprey

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 →