RiverFish

Perch · Perca fluviatilis

Perch in the River Monkey island

Largest measured perch: 14.7 cm

The largest perch measured in Environment Agency surveys of the River Monkey island was 14.7 cm, recorded at Monkey Island Upstream Fry on 18 August 2015.

Across 492 measured perch, the median measured length was 6 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 Monkey island.

See perch records across England →

Most recent observation4 September 2025Monkey Island Downstream Fry · 11 fish
Largest measured perch
14.7 cm
Median length
6 cm
Fish measured
492
Survey locations
2

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
14.7 cm18 Aug 2015Monkey Island Upstream Fry146040
14.6 cm18 Aug 2015Monkey Island Upstream Fry146040
14.5 cm21 Aug 2003Monkey Island Upstream Fry117041
14 cm20 Aug 2018Monkey Island Downstream Fry153439
13.8 cm1 Sept 2006Monkey Island Upstream Fry111834
13.6 cm22 Aug 2017Monkey Island Downstream Fry151488
13.3 cm18 Aug 2015Monkey Island Upstream Fry146040
13.2 cm21 Aug 2003Monkey Island Upstream Fry117041
12.9 cm18 Aug 2015Monkey Island Upstream Fry146040
12.8 cm21 Aug 2003Monkey Island Upstream Fry117041

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
Monkey Island Downstream Fry21 Aug 20034 Sept 202514
Monkey Island Upstream Fry21 Aug 200320 Aug 201816

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

2003–2025

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 492 measured fish were spread across different length ranges.

Smallest
2.4 cm
Lower quarter
5.4 cm
Median
6 cm
Upper quarter
7.1 cm
Largest
14.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Monkey island

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

Chub Roach Dace Gudgeon Minnow Bleak

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 →