Roach · Rutilus rutilus

Roach in the River Irwell

Largest measured roach: 13.6 cm

The largest roach measured in Environment Agency surveys of the River Irwell was 13.6 cm, recorded at Iwir25 on 6 June 2006.

Across 50 measured roach, the median measured length was 7.5 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 Irwell.

See roach records across England →

Most recent observation7 June 2006Iwir10 · 2 fish

Largest measured roach: 13.6 cm
Median length: 7.5 cm
Fish measured: 50
Survey locations: 4

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
13.6 cm	6 Jun 2006	Iwir25	100984
13 cm	6 Jun 2006	Iwir20	100188
12.4 cm	6 Jun 2006	Iwir20	100188
12.3 cm	6 Jun 2006	Iwir20	100188
12 cm	6 Jun 2006	Iwir20	100188
12 cm	6 Jun 2006	Iwir20	100188
12 cm	6 Jun 2006	Iwir20	100188
11.8 cm	7 Jun 2006	Iwir10	100157
11.6 cm	6 Jun 2006	Iwir20	100188
11.3 cm	6 Jun 2006	Iwir25	100984

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
Iwir10	1 Jul 2004	7 Jun 2006	3
Iwir25	7 Jun 2005	6 Jun 2006	2
Iwir20	28 Jun 2004	6 Jun 2006	3
Iwir15	8 Jun 2005	5 Jun 2006	2

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

2004–2006

Survey records by year

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

204

405

406

Fish measured by surveyors

Measured length distribution

See how the 50 measured fish were spread across different length ranges.

Smallest: 4.5 cm
Lower quarter: 5.1 cm
Median: 7.5 cm
Upper quarter: 10.9 cm
Largest: 13.6 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Irwell

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

Brown / sea trout Bullhead Minnow Stone loach 3-spined stickleback Gudgeon

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 →