Chub · Leuciscus cephalus

Chub in the River Box (Main Reaches)

Largest measured chub: 43.5 cm

The largest chub measured in Environment Agency surveys of the River Box (Main Reaches) was 43.5 cm, recorded at Stour Confluence on 22 March 1985.

Across 3,267 measured chub, the median measured length was 14.8 cm.

Surveyors recorded weights for 10 chub. The median was 7.3 oz (0.2075 kg) and the largest recorded weight was 11.4 oz (0.322 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 Box (Main Reaches).

See chub records across England →

Most recent observation22 May 2026Stour Confluence · 89 fish

Largest measured chub: 43.5 cm
Median length: 14.8 cm
Fish measured: 3,267
Survey locations: 7

Individual EA measurements

Largest measured chub

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
43.5 cm	22 Mar 1985	Stour Confluence	13773
41.9 cm	2 May 1997	Thorington Mill	13800
40.2 cm	22 Mar 1985	Stour Confluence	13773
39.5 cm	22 Mar 1985	Stour Confluence	13773
39 cm	7 May 1997	Scotland Street	13801
39 cm	7 May 1997	Scotland Street	13801
39 cm	12 Apr 1991	Thorington Mill	13786
39 cm	22 Mar 1985	Stour Confluence	13773
38.1 cm	2 May 1997	Thorington Mill	13800
38 cm	29 Apr 1994	Polstead Mill	13795

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where chub were found

Each point marks a survey location with at least one chub 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 chub
Stour Confluence	16 Sept 1981	22 May 2026	18
Scotland Street	26 Mar 1985	21 May 2026	15
Thorington Mill	25 Mar 1985	8 May 2024	11
Stone Street	18 Apr 1991	18 May 2015	6
Polstead Ford	14 Apr 1988	6 May 2015	7
Polstead Mill	27 Mar 1985	28 Apr 2015	8
Peyton Hall Farm	5 May 1994	23 May 2006	3

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

1981–2026

Survey records by year

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

181

082

083

084

485

086

087

588

089

090

691

092

093

794

095

096

697

098

099

700

001

002

003

004

005

706

007

008

009

210

011

312

013

214

615

216

017

318

019

020

121

122

023

324

025

226

Fish measured by surveyors

Measured length distribution

See how the 3,267 measured fish were spread across different length ranges.

Smallest: 2.9 cm
Lower quarter: 10.9 cm
Median: 14.8 cm
Upper quarter: 19.1 cm
Largest: 43.5 cm

0–99 mm

620

100–199 mm

1944

200–299 mm

578

300–399 mm

122

400–499 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 10 chub. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.002 kg)
Lower quarter: 1.9 oz (0.0528 kg)
Median: 7.3 oz (0.2075 kg)
Upper quarter: 8.4 oz (0.2368 kg)
Heaviest: 11.4 oz (0.322 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 Box (Main Reaches)

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

European eel Brown / sea trout Stone loach Dace Roach 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 →