Roach · Rutilus rutilus

Roach in the Main River Marden

Largest measured roach: 30.6 cm

The largest roach measured in Environment Agency surveys of the Main River Marden was 30.6 cm, recorded at Calne STW (Te) on 21 May 1998.

Across 155 measured roach, the median measured length was 14.7 cm.

Surveyors recorded weights for 151 roach. The median was 1.8 oz (0.05 kg) and the largest recorded weight was 1 lb 4.2 oz (0.574 kg).

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

See roach records across England →

Most recent observation19 May 2011Calne STW (Te) · 1 fish

Largest measured roach: 30.6 cm
Median length: 14.7 cm
Fish measured: 155
Survey locations: 6

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
30.6 cm	21 May 1998	Calne STW (Te)	77061
27.1 cm	18 Aug 2004	New Leaze Farm	81343
26 cm	21 May 1998	Calne STW (Te)	77061
22.7 cm	21 May 1998	Calne STW (Te)	77061
22.4 cm	3 Sept 1998	Abbey Farm	77060
21.5 cm	21 May 1998	Calne STW (Te)	77061
21.5 cm	21 May 1998	Calne STW (Te)	77061
21.3 cm	18 Aug 2004	New Leaze Farm	81343
21.3 cm	21 May 1998	Calne STW (Te)	77061
20.6 cm	21 May 1998	Calne STW (Te)	77061

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
Stanley	19 May 2011	19 May 2011	1
Calne STW (Te)	21 May 1998	19 May 2011	7
New Leaze Farm	15 Oct 1997	19 Jul 2006	4
Abbey Farm	3 Sept 1998	3 Sept 1998	1
Downstream Calne	13 May 1998	13 May 1998	1
Scott's Mill	14 Oct 1997	14 Oct 1997	1

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

1997–2011

Survey records by year

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

297

398

099

000

001

202

103

204

105

206

007

008

009

010

211

Fish measured by surveyors

Measured length distribution

See how the 155 measured fish were spread across different length ranges.

Smallest: 6 cm
Lower quarter: 10.5 cm
Median: 14.7 cm
Upper quarter: 17.7 cm
Largest: 30.6 cm

0–99 mm

100–199 mm

112

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 151 roach. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.002 kg)
Lower quarter: 0.7 oz (0.019 kg)
Median: 1.8 oz (0.05 kg)
Upper quarter: 3.3 oz (0.094 kg)
Heaviest: 1 lb 4.2 oz (0.574 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the Main River Marden

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

Bullhead Brown / sea trout Minnow Gudgeon Dace Stone loach

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 →