Roach · Rutilus rutilus

Roach in the Itchen Navigation

Largest measured roach: 33.5 cm

The largest roach measured in Environment Agency surveys of the Itchen Navigation was 33.5 cm, recorded at Ham Farm on 2 September 2019.

Across 147 measured roach, the median measured length was 20.4 cm.

Surveyors recorded weights for 83 roach. The median was 3.4 oz (0.095 kg) and the largest recorded weight was 1 lb 10.1 oz (0.74 kg).

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

See roach records across England →

Most recent observation27 October 2025Ham Farm · 4 fish

Largest measured roach: 33.5 cm
Median length: 20.4 cm
Fish measured: 147
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
33.5 cm	2 Sept 2019	Ham Farm	155311
33.4 cm	18 Sept 2002	Allbrook Lock	55075
32.7 cm	18 Sept 2002	Allbrook Lock	55075
31.8 cm	18 Sept 2002	Allbrook Lock	55075
31.4 cm	2 Sept 2019	Ham Farm	155311
29.3 cm	20 Oct 2003	Riverside Park	77789
29 cm	27 Oct 2025	Ham Farm	179579
28 cm	2 Sept 2019	Ham Farm	155311
27.9 cm	19 Sept 2005	Allbrook Lock	86420
27.8 cm	20 Oct 2003	Riverside Park	77789

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
Ham Farm	23 Aug 2017	27 Oct 2025	5
Allbrook Lock	18 Sept 2002	19 Sept 2006	3
Tun Bridge	9 Sept 2006	9 Sept 2006	1
Riverside Park	19 Sept 2002	6 Oct 2004	3

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

2002–2025

Survey records by year

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

202

103

104

105

206

007

008

009

010

011

012

013

014

015

016

117

018

119

020

021

122

123

024

125

Fish measured by surveyors

Measured length distribution

See how the 147 measured fish were spread across different length ranges.

Smallest: 8.4 cm
Lower quarter: 16.3 cm
Median: 20.4 cm
Upper quarter: 23.9 cm
Largest: 33.5 cm

0–99 mm

100–199 mm

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

Lightest: 0.3 oz (0.009 kg)
Lower quarter: 1.9 oz (0.0545 kg)
Median: 3.4 oz (0.095 kg)
Upper quarter: 7.8 oz (0.2215 kg)
Heaviest: 1 lb 10.1 oz (0.74 kg)

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

More fish in this river

Explore the Itchen Navigation

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

European eel Pike Minnow Grayling Atlantic salmon Brown / sea trout

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 →