RiverFish

Perch · Perca fluviatilis

Perch in the Swavesey Drain

Largest measured perch: 18 cm

The largest perch measured in Environment Agency surveys of the Swavesey Drain was 18 cm, recorded at DS Webs Hole Sluice on 18 April 2005.

Across 14 measured perch, the median measured length was 8.3 cm.

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

See perch records across England →

Most recent observation20 May 2026US Webs Hole Sluice · 1 fish
Largest measured perch
18 cm
Median length
8.3 cm
Fish measured
14
Survey locations
3

Individual EA measurements

Largest measured perch

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
18 cm18 Apr 2005DS Webs Hole Sluice84408
13.5 cm18 Apr 2005US Webs Hole Sluice84402
12 cm18 Apr 2005DS Webs Hole Sluice84408
9.3 cm2 May 2013US Webs Hole Sluice135942
8.9 cm2 May 2013US Webs Hole Sluice135942
8.8 cm2 May 2013US Webs Hole Sluice135942
8.5 cm2 May 2013US Webs Hole Sluice135942
8.2 cm20 May 2026US Webs Hole Sluice181635
8.2 cm2 May 2013US Webs Hole Sluice135942
7.6 cm2 May 2013US Webs Hole Sluice135942

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where perch were found

Each point marks a survey location with at least one perch 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 perch
US Webs Hole Sluice18 Apr 200520 May 20263
Swavesey Drain (Eel Monitoring)2 May 20132 May 20131
DS Webs Hole Sluice18 Apr 200518 Apr 20051

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

2005–2026

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 14 measured fish were spread across different length ranges.

Smallest
7 cm
Lower quarter
7.5 cm
Median
8.4 cm
Upper quarter
9.2 cm
Largest
18 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Swavesey Drain

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

Dace Roach Tench Common bream European eel

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 →