Roach · Rutilus rutilus

Roach in the River Mersey

Largest measured roach: 31 cm

The largest roach measured in Environment Agency surveys of the River Mersey was 31 cm, recorded at Mrme45 on 26 September 2004.

Across 747 measured roach, the median measured length was 17 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 Mersey.

See roach records across England →

Most recent observation17 October 2010Mrme45 · 143 fish

Largest measured roach: 31 cm
Median length: 17 cm
Fish measured: 747
Survey locations: 7

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 cm	26 Sept 2004	Mrme45	82502
30.5 cm	29 Sept 2000	Mrme33	104055
28.5 cm	17 Oct 2010	Mrme45	125131
28.5 cm	26 Sept 2004	Mrme45	82502
28 cm	29 Sept 2000	Mrme33	104055
27.1 cm	19 Oct 2008	Mrme45	120304
26.3 cm	26 Sept 2004	Mrme45	82502
26.2 cm	18 Sept 2005	Mrme45	86252
25.9 cm	20 Sept 2009	Mrme45	120838
25.8 cm	12 Oct 2000	Mrme33	104062

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
Mrme45	17 Aug 2003	17 Oct 2010	7
Mrme30	4 Nov 2007	25 Sept 2010	4
Mrme05	2 Oct 2003	14 Jul 2006	2
Mrme11	27 Jun 2005	27 Jun 2005	1
Mrme10	6 Aug 2003	6 Aug 2003	1
Mrme15	17 Oct 2002	17 Oct 2002	1
Mrme33	17 May 2000	18 Oct 2000	6

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

2000–2010

Survey records by year

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

600

001

102

303

104

205

106

207

108

309

210

Fish measured by surveyors

Measured length distribution

See how the 747 measured fish were spread across different length ranges.

Smallest: 4.5 cm
Lower quarter: 14.3 cm
Median: 17 cm
Upper quarter: 19.5 cm
Largest: 31 cm

0–99 mm

100–199 mm

552

200–299 mm

162

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Mersey

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

Gudgeon 3-spined stickleback Chub Minnow Perch Dace

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 →