Roach · Rutilus rutilus

Roach in the River Morden Hall

Largest measured roach: 31.6 cm

The largest roach measured in Environment Agency surveys of the River Morden Hall was 31.6 cm, recorded at Morden Hall Enhancement site on 27 June 2008.

Across 459 measured roach, the median measured length was 13.7 cm.

Surveyors recorded weights for 28 roach. The median was 5.5 oz (0.1565 kg) and the largest recorded weight was 15.8 oz (0.449 kg).

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

See roach records across England →

Most recent observation1 October 2025Morden Hall Park · 68 fish

Largest measured roach: 31.6 cm
Median length: 13.7 cm
Fish measured: 459
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
31.6 cm	27 Jun 2008	Morden Hall Enhancement site	112207
28.6 cm	22 Jul 1997	Morden Hall Park	116863
28.4 cm	22 Jul 1997	Morden Hall Park	116863
28.1 cm	29 Mar 1994	Morden Hall Park - Upstream Run	116853
27.5 cm	22 Jul 1997	Morden Hall Park	116863
27.5 cm	22 Jul 1997	Morden Hall Park	116863
27.5 cm	22 Jul 1997	Morden Hall Park	116863
27 cm	27 Jun 2008	Morden Hall Enhancement site	112207
27 cm	22 Jul 1997	Morden Hall Park	116863
27 cm	22 Jul 1997	Morden Hall Park	116863

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
Morden Hall Park	22 Jul 1997	1 Oct 2025	8
Snuff Mill Distributary Adj Morden Hall Road gate	19 Jan 2010	19 Jan 2010	1
Morden Hall Enhancement site	27 Jun 2008	27 Jun 2008	1
Morden Hall Downstream stretch	27 Jun 2008	27 Jun 2008	1
Morden Hall Park - Upstream Run	29 Mar 1994	29 Mar 1994	1
Morden Hall Deer Park	26 Jul 1988	26 Jul 1988	1

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

1988–2025

Survey records by year

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

188

089

090

091

092

093

194

095

096

197

098

099

000

001

102

003

004

005

006

007

208

109

110

111

012

113

014

115

016

117

018

019

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 459 measured fish were spread across different length ranges.

Smallest: 4.4 cm
Lower quarter: 11.6 cm
Median: 13.7 cm
Upper quarter: 18.5 cm
Largest: 31.6 cm

0–99 mm

100–199 mm

298

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 28 roach. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.004 kg)
Lower quarter: 1.3 oz (0.0368 kg)
Median: 5.5 oz (0.1565 kg)
Upper quarter: 9 oz (0.2548 kg)
Heaviest: 15.8 oz (0.449 kg)

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

More fish in this river

Explore the River Morden Hall

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

Gudgeon Chub European eel Dace Stone loach 3-spined stickleback

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 →