RiverFish

Flounder · Platichthys flesus

Flounder in the River Trent

Largest measured flounder: 30.6 cm

The largest flounder measured in Environment Agency surveys of the River Trent was 30.6 cm, recorded at North Clifton Net on 16 October 2015.

Across 114 measured flounder, the median measured length was 3.3 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 Trent.

See flounder records across England →

Most recent observation4 September 2025North Clifton Net · 4 fish
Largest measured flounder
30.6 cm
Median length
3.3 cm
Fish measured
114
Survey locations
2

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
30.6 cm16 Oct 2015North Clifton Net147572
29.7 cm28 Sept 2011North Clifton Net128327
8.8 cm19 Oct 2010North Clifton Net124495
8.4 cm19 Oct 2010North Clifton Net124495
8.4 cm17 Aug 2007Dunham Net107690
8.2 cm4 Oct 2023North Clifton Net164173
8 cm19 Oct 2010North Clifton Net124495
7.5 cm4 Oct 2023North Clifton Net164173
7.2 cm19 Oct 2010North Clifton Net124495
6.9 cm10 Oct 2012North Clifton Net134361

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
North Clifton Net19 Oct 20104 Sept 202510
Dunham Net17 Aug 200717 Aug 20071

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

2007–2025

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 114 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
2.8 cm
Median
3.3 cm
Upper quarter
5.1 cm
Largest
30.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Trent

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

Chub Roach Dace Gudgeon Perch Minnow

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 →