RiverFish

Flounder · Platichthys flesus

Flounder in the River Hull eel surveys

Largest measured flounder: 29.9 cm

The largest flounder measured in Environment Agency surveys of the River Hull eel surveys was 29.9 cm, recorded at Arram beck on 12 June 2013.

Across 32 measured flounder, the median measured length was 13.1 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 Hull eel surveys.

See flounder records across England →

Most recent observation2 June 2025Mires beck at Sands bridge · 3 fish
Largest measured flounder
29.9 cm
Median length
13.1 cm
Fish measured
32
Survey locations
5

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
29.9 cm12 Jun 2013Arram beck136539
24.2 cm12 Jun 2013Arram beck136539
21.3 cm1 Jun 2015Hedon Haven at Thorne Road Bridge144856
20 cm1 Jun 2015Hedon Haven at Thorne Road Bridge144856
17.4 cm1 Jun 2015Hedon Haven at Thorne Road Bridge144856
16.3 cm2 Jun 2025Mires beck at Sands bridge176711
15.8 cm15 Jul 2021Mires beck at Sands bridge159945
15 cm10 Jun 2013Driffield Navigational canal at Brigham136369
14.7 cm15 Jul 2021Mires beck at Sands bridge159945
14.7 cm1 Jun 2015Hedon Haven at Thorne Road Bridge144856

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
Mires beck at Sands bridge7 Jun 20132 Jun 20257
Arram beck12 Jun 201313 Jul 20213
Watton beck at Bridge House Farm5 Jun 20155 Jun 20151
Hedon Haven at Thorne Road Bridge1 Jun 20151 Jun 20151
Driffield Navigational canal at Brigham10 Jun 201310 Jun 20131

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

2013–2025

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 32 measured fish were spread across different length ranges.

Smallest
9.8 cm
Lower quarter
11.4 cm
Median
13.1 cm
Upper quarter
14.8 cm
Largest
29.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Hull eel surveys

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

Roach 3-spined stickleback European eel Pike Stone loach Perch

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 →