RiverFish

Flounder · Platichthys flesus

Flounder in the Testwood & Nursling Fishery

Largest measured flounder: 20.3 cm

The largest flounder measured in Environment Agency surveys of the Testwood & Nursling Fishery was 20.3 cm, recorded at Wirehouse stream - South Arm on 13 August 2025.

Across 15 measured flounder, the median measured length was 5.8 cm.

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

See flounder records across England →

Most recent observation13 August 2025Wirehouse stream - South Arm · 2 fish
Largest measured flounder
20.3 cm
Median length
5.8 cm
Fish measured
15
Survey locations
4

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
20.3 cm13 Aug 2025Wirehouse stream - South Arm179212
11.2 cm21 Aug 2024Wirehouse stream - North Arm166396
7.1 cm15 Oct 2018Wirehouse stream - South Arm153863
6.8 cm15 Oct 2018Wirehouse stream - South Arm153863
6.1 cm15 Oct 2018Wirehouse stream - North Arm153862
6 cm7 Oct 2019Wirehouse stream - North Arm155678
5.8 cm7 Oct 2019Wirehouse stream - North Arm155678
5.8 cm15 Oct 2018Wirehouse stream - North Arm153862
5 cm15 Oct 2018Wirehouse stream - South Arm153863
5 cm15 Oct 2018Wirehouse stream - North Arm153862

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
Wirehouse stream - South Arm15 Oct 201813 Aug 20252
Wirehouse stream - North Arm15 Oct 201821 Aug 20243
Testwood Pool - The Bay29 Aug 201920 Aug 20242
Testwood Pool - House Bank29 Aug 201929 Aug 20191

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

2018–2025

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 15 measured fish were spread across different length ranges.

Smallest
3.9 cm
Lower quarter
4.9 cm
Median
5.8 cm
Upper quarter
6.5 cm
Largest
20.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Testwood & Nursling Fishery

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

European eel Brook lamprey Bullhead Atlantic salmon Chub Brown / sea trout

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 →