Roach · Rutilus rutilus

Roach in the Main River Biss

Largest measured roach: 23 cm

The largest roach measured in Environment Agency surveys of the Main River Biss was 23 cm, recorded at Ladydown Mill on 11 September 1997.

Across 123 measured roach, the median measured length was 10 cm.

Surveyors recorded weights for 121 roach. The median was 0.6 oz (0.016 kg) and the largest recorded weight was 9.5 oz (0.27 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 Biss.

See roach records across England →

Most recent observation28 June 2012Ashton Hill Farm · 2 fish

Largest measured roach: 23 cm
Median length: 10 cm
Fish measured: 123
Survey locations: 3

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
23 cm	11 Sept 1997	Ladydown Mill	77050
21.5 cm	11 Sept 1997	Ladydown Mill	77050
20.6 cm	11 Sept 1997	Ladydown Mill	77050
20 cm	11 Sept 1997	Ladydown Mill	77050
19.5 cm	11 Sept 1997	Ladydown Mill	77050
19.3 cm	11 Sept 1997	Ladydown Mill	77050
19.2 cm	11 Sept 1997	Ladydown Mill	77050
19 cm	11 Sept 1997	Ladydown Mill	77050
18.6 cm	11 Sept 1997	Ladydown Mill	77050
17.3 cm	11 Sept 1997	Ladydown Mill	77050

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
Ashton Hill Farm	31 Jul 1997	28 Jun 2012	2
u/s Blackball Hatch (Te)	14 Jul 2004	11 Jul 2005	2
Ladydown Mill	11 Sept 1997	11 Sept 1997	1

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

1997–2012

Survey records by year

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

297

098

099

000

001

002

003

104

105

006

007

008

009

010

011

112

Fish measured by surveyors

Measured length distribution

See how the 123 measured fish were spread across different length ranges.

Smallest: 5.1 cm
Lower quarter: 8.1 cm
Median: 10 cm
Upper quarter: 12.2 cm
Largest: 23 cm

0–99 mm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 121 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: 0.2 oz (0.007 kg)
Median: 0.6 oz (0.016 kg)
Upper quarter: 0.9 oz (0.026 kg)
Heaviest: 9.5 oz (0.27 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 Biss

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

Bullhead Brown / sea trout Minnow Chub Dace 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 →