Flounder · Platichthys flesus

Flounder in the River Wharfe

Largest measured flounder: 37.8 cm

The largest flounder measured in Environment Agency surveys of the River Wharfe was 37.8 cm, recorded at Boston Spa on 18 July 2002.

Across 342 measured flounder, the median measured length was 16.4 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 Wharfe.

See flounder records across England →

Most recent observation20 August 2024Tadcaster post 2006 · 12 fish

Largest measured flounder: 37.8 cm
Median length: 16.4 cm
Fish measured: 342
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.

Length	Survey date	Survey location	Survey ID
37.8 cm	18 Jul 2002	Boston Spa	73194
36.2 cm	28 Jun 2005	Ulleskelf	88093
36.2 cm	22 Jul 2004	Tadcaster pre 2006	81664
35.6 cm	23 Jul 2003	Tadcaster pre 2006	78325
34 cm	9 Jul 2010	Tadcaster post 2006	124961
33.6 cm	8 Jul 2010	Ulleskelf	124960
33.5 cm	2 Jul 2008	Ulleskelf	111590
33.3 cm	20 Aug 2024	Tadcaster post 2006	166388
32.6 cm	17 Jul 2002	Ulleskelf	73186
32.4 cm	2 Jul 2008	Ulleskelf	111590

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
Tadcaster post 2006	9 Aug 2006	20 Aug 2024	4
Ulleskelf	25 Jul 1996	16 Jul 2014	14
Tadcaster pre 2006	24 Jul 1996	30 Jun 2005	8
Ryther	20 Jul 2004	20 Jul 2004	1
Boston Spa	18 Jul 2000	18 Jul 2002	2

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

1996–2024

Survey records by year

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

296

297

298

199

200

101

302

203

304

205

106

107

108

009

210

111

012

013

214

015

016

017

018

019

020

021

022

023

124

Fish measured by surveyors

Measured length distribution

See how the 342 measured fish were spread across different length ranges.

Smallest: 3 cm
Lower quarter: 11.2 cm
Median: 16.4 cm
Upper quarter: 23.4 cm
Largest: 37.8 cm

0–99 mm

100–199 mm

152

200–299 mm

106

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Wharfe

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

Minnow Bullhead Stone loach Brown / sea trout European eel Chub

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 →