Flounder · Platichthys flesus

Flounder in the Horsey Mere

Largest measured flounder: 20.4 cm

The largest flounder measured in Environment Agency surveys of the Horsey Mere was 20.4 cm, recorded at 78 on 17 October 1986.

Across 42 measured flounder, the median measured length was 9.3 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Horsey Mere.

See flounder records across England →

Most recent observation1 September 200578 · 1 fish

Largest measured flounder: 20.4 cm
Median length: 9.3 cm
Fish measured: 42
Survey locations: 9

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
20.4 cm	17 Oct 1986	78	16977
17.6 cm	17 Oct 1986	78	16977
17.4 cm	17 Oct 1986	78	16977
17.2 cm	17 Oct 1986	78	16977
16 cm	16 Oct 1986	76	16975
15.6 cm	17 Oct 1986	78	16977
15 cm	17 Oct 1986	78	16977
14 cm	31 Aug 2005	77	85903
13.5 cm	25 Aug 1998	82	17001
11.4 cm	17 Oct 1986	78	16977

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
78	17 Oct 1986	1 Sept 2005	2
77	16 Oct 1986	31 Aug 2005	2
82	25 Aug 1998	25 Aug 1998	1
86	24 Sept 1993	24 Sept 1993	1
85	22 Sept 1993	22 Sept 1993	1
84	22 Oct 1986	22 Oct 1986	1
80	21 Oct 1986	21 Oct 1986	1
79	17 Oct 1986	17 Oct 1986	1
76	16 Oct 1986	16 Oct 1986	1

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

1986–2005

Survey records by year

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

686

087

088

089

090

091

092

293

094

095

096

097

198

099

000

001

002

003

004

205

Fish measured by surveyors

Measured length distribution

See how the 42 measured fish were spread across different length ranges.

Smallest: 6.6 cm
Lower quarter: 8.3 cm
Median: 9.3 cm
Upper quarter: 11.1 cm
Largest: 20.4 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 Horsey Mere

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

Roach Perch 3-spined stickleback Pike Common bream Common goby

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 →