Roach · Rutilus rutilus

Roach in the Grantham Canal

Largest measured roach: 31.7 cm

The largest roach measured in Environment Agency surveys of the Grantham Canal was 31.7 cm, recorded at Denton Road Bridge on 20 May 1985.

Across 9,749 measured roach, the median measured length was 9.3 cm.

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

See roach records across England →

Most recent observation22 April 1997Harlaxton Bridge · 2,285 fish

Largest measured roach: 31.7 cm
Median length: 9.3 cm
Fish measured: 9,749
Survey locations: 5

Individual EA measurements

Largest measured roach

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
31.7 cm	20 May 1985	Denton Road Bridge	53063
28.6 cm	13 May 1988	Denton Wharf	53162
25.9 cm	4 May 1988	Earlsfield Road	53163
25.1 cm	13 May 1988	Denton Wharf	53162
24.6 cm	4 May 1988	Earlsfield Road	53163
24.1 cm	13 May 1988	Denton Wharf	53162
24.1 cm	4 May 1988	Earlsfield Road	53163
23.7 cm	22 May 1985	Denton Wharf	53066
23.6 cm	18 Apr 1997	Denton Wharf	53371
23.5 cm	22 May 1985	Denton Wharf	53066

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

Explore the river

Where roach were found

Each point marks a survey location with at least one roach 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 roach
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
Earlsfield Road	4 May 1988	4 May 1988	1

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 roach that year.

485

086

087

488

089

090

291

092

093

094

095

096

497

Fish measured by surveyors

Measured length distribution

See how the 9,749 measured fish were spread across different length ranges.

Smallest: 1.6 cm
Lower quarter: 7.3 cm
Median: 9.3 cm
Upper quarter: 11.7 cm
Largest: 31.7 cm

0–99 mm

5316

100–199 mm

4387

200–299 mm

300–399 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 Perch 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 →