Flounder · Platichthys flesus

Flounder in the River R.Ancholme Subcatchments

Largest measured flounder: 26.8 cm

The largest flounder measured in Environment Agency surveys of the River R.Ancholme Subcatchments was 26.8 cm, recorded at South Ferriby on 12 September 1986.

Across 45 measured flounder, the median measured length was 16.3 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 R.Ancholme Subcatchments.

See flounder records across England →

Most recent observation12 July 2002Horkstow Bridge · 1 fish

Largest measured flounder: 26.8 cm
Median length: 16.3 cm
Fish measured: 45
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.

Length	Survey date	Survey location	Survey ID
26.8 cm	12 Sept 1986	South Ferriby	57525
25.7 cm	12 Sept 1986	South Ferriby	57525
25 cm	12 Jul 2002	Horkstow Bridge	72252
24 cm	5 Jul 1989	Saxby All Saints Bridge	57551
23.3 cm	20 Jul 1989	Land Drain Saxby	57554
23 cm	12 Sept 1986	South Ferriby	57525
22.1 cm	12 Sept 1986	South Ferriby	57525
22 cm	12 Sept 1986	South Ferriby	57525
21 cm	12 Sept 1986	South Ferriby	57525
20.1 cm	25 Jul 1989	Brigg Leisure Centre	57546

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 surveyed	First recorded	Last recorded	Visits finding flounder
Horkstow Bridge	12 Jul 2002	12 Jul 2002	1
Land Drain Horkstow	3 Jul 1989	1 Aug 1996	3
Brigg Leisure Centre	25 Jul 1989	25 Jul 1989	1
Land Drain Saxby	20 Jul 1989	20 Jul 1989	1
Saxby All Saints Bridge	5 Jul 1989	5 Jul 1989	1
South Ferriby	12 Sept 1986	12 Sept 1986	1

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

1986–2002

Survey records by year

Each bar shows how many survey visits recorded flounder that year.

186

087

088

489

090

091

092

193

094

095

196

097

098

099

000

001

102

Fish measured by surveyors

Measured length distribution

See how the 45 measured fish were spread across different length ranges.

Smallest: 2.7 cm
Lower quarter: 12.4 cm
Median: 16.3 cm
Upper quarter: 19.6 cm
Largest: 26.8 cm

0–99 mm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River R.Ancholme Subcatchments

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

Pike Perch European eel Roach Silver bream Dace

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 →