Perch · Perca fluviatilis

Perch in the Grantham Canal

Largest measured perch: 21 cm

The largest perch measured in Environment Agency surveys of the Grantham Canal was 21 cm, recorded at Casthorpe Bridge on 16 April 1997.

Across 956 measured perch, the median measured length was 7.4 cm.

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

See perch records across England →

Most recent observation28 April 1997Earlsfield Road · 9 fish

Largest measured perch: 21 cm
Median length: 7.4 cm
Fish measured: 956
Survey locations: 5

Individual EA measurements

Largest measured perch

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
21 cm	16 Apr 1997	Casthorpe Bridge	53369
20.2 cm	28 Apr 1997	Earlsfield Road	53373
19.2 cm	28 Apr 1997	Earlsfield Road	53373
19 cm	28 Apr 1997	Earlsfield Road	53373
18.6 cm	5 May 1988	Denton Road Bridge	53160
17.8 cm	13 May 1988	Denton Wharf	53162
17.3 cm	28 Apr 1997	Earlsfield Road	53373
17.2 cm	5 May 1988	Denton Road Bridge	53160
16.7 cm	9 May 1988	Casthorpe Bridge	53161
16.3 cm	28 Apr 1997	Earlsfield Road	53373

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 surveyed	First recorded	Last recorded	Visits finding perch
Earlsfield Road	28 Apr 1997	28 Apr 1997	1
Harlaxton Bridge	8 Aug 1985	22 Apr 1997	3
Denton Wharf	22 May 1985	18 Apr 1997	3
Denton Road Bridge	20 May 1985	17 Apr 1997	4
Casthorpe Bridge	23 May 1985	16 Apr 1997	3

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

1985–1997

Survey records by year

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

485

086

087

388

089

090

291

092

093

094

095

096

597

Fish measured by surveyors

Measured length distribution

See how the 956 measured fish were spread across different length ranges.

Smallest: 3.8 cm
Lower quarter: 6.7 cm
Median: 7.4 cm
Upper quarter: 9 cm
Largest: 21 cm

0–99 mm

801

100–199 mm

153

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Grantham Canal

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

Pike Roach Tench Common bream Rudd

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 →