Flounder · Platichthys flesus

Flounder in the River Main Plym

Largest measured flounder: 26.8 cm

The largest flounder measured in Environment Agency surveys of the River Main Plym was 26.8 cm, recorded at Plym Bridge on 20 June 2025.

Across 4 measured flounder, the median measured length was 15.3 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 Main Plym.

See flounder records across England →

Most recent observation20 June 2025Plym Bridge · 2 fish

Largest measured flounder: 26.8 cm
Median length: 15.3 cm
Fish measured: 4
Survey locations: 1

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	20 Jun 2025	Plym Bridge	177036
16.3 cm	14 Jun 2013	Plym Bridge	136402
14.4 cm	20 Jun 2025	Plym Bridge	177036
11.6 cm	14 Jun 2013	Plym Bridge	136402

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
Plym Bridge	29 Jul 1982	20 Jun 2025	6

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

1982–2025

Survey records by year

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

182

083

084

085

086

087

088

089

090

091

092

093

094

095

096

097

098

099

000

001

102

003

004

005

106

107

008

009

010

011

012

113

014

015

016

017

018

019

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 4 measured fish were spread across different length ranges.

Smallest: 11.6 cm
Lower quarter: 13.7 cm
Median: 15.4 cm
Upper quarter: 18.9 cm
Largest: 26.8 cm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Plym

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

European eel Brown / sea trout Atlantic salmon Bullhead 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 →