RiverFish

Flounder · Platichthys flesus

Flounder in the River Lostock

Largest measured flounder: 27 cm

The largest flounder measured in Environment Agency surveys of the River Lostock was 27 cm, recorded at Earnshaw Bridge on 24 July 1995.

Across 92 measured flounder, the median measured length was 14 cm.

Surveyors recorded weights for 3 flounder. The median was 3 oz (0.086 kg) and the largest recorded weight was 3.6 oz (0.101 kg).

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

See flounder records across England →

Most recent observation25 July 2018Mill Lane · 21 fish
Largest measured flounder
27 cm
Median length
14 cm
Fish measured
92
Survey locations
10

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
27 cm24 Jul 1995Earnshaw Bridge113121
26 cm7 Jul 2011Cowling lane126916
25.5 cm24 Jul 1995Dunkirk Pub113120
25.2 cm17 Aug 2006Mill Lane101252
25.2 cm17 Aug 2006Mill Lane101252
25 cm7 Jul 2011Cowling lane126916
23.6 cm17 Aug 2006Mill Lane101252
23.6 cm17 Aug 2006Mill Lane101252
23 cm7 Jul 2011Cowling lane126916
23 cm24 Jul 1995Dunkirk Pub113120

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
Mill Lane24 Jul 200025 Jul 20184
Cowling lane30 Aug 200625 Jul 20183
Below Farrington Weir25 Jul 201825 Jul 20181
Ulnes Walton Bridge25 Jul 199525 Jul 19951
Lostock Bridge at Croston22 Mar 199525 Jul 19952
Earnshaw Bridge24 Jul 199524 Jul 19951
Dunkirk Pub24 Jul 199524 Jul 19951
Lostock Bridge Farm5 Apr 19955 Apr 19951
500m Above Ulnes Walton Bridge5 Apr 19955 Apr 19951
Above STW outfall4 Apr 19954 Apr 19951

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

1995–2018

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 92 measured fish were spread across different length ranges.

Smallest
4 cm
Lower quarter
7 cm
Median
14 cm
Upper quarter
18.9 cm
Largest
27 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 3 flounder. This is a subset of the measured fish and may not represent the whole population.

Lightest
2.4 oz (0.069 kg)
Lower quarter
2.7 oz (0.0775 kg)
Median
3 oz (0.086 kg)
Upper quarter
3.3 oz (0.0935 kg)
Heaviest
3.6 oz (0.101 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Lostock

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

European eel Chub Roach Gudgeon Dace Perch

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 →