Stone loach · Barbatula barbatula

Stone loach in the Sandon Brook (Main Reaches)

Largest measured stone loach: 11.9 cm

The largest stone loach measured in Environment Agency surveys of the Sandon Brook (Main Reaches) was 11.9 cm, recorded at Graces Walk on 29 May 2019.

Across 100 measured stone loach, the median measured length was 9.2 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Sandon Brook (Main Reaches).

See stone loach records across England →

Most recent observation9 May 2025Boreham Bridge (Sandon Brook) · 2 fish

Largest measured stone loach: 11.9 cm
Median length: 9.2 cm
Fish measured: 100
Survey locations: 4

Individual EA measurements

Largest measured stone loach

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
11.9 cm	29 May 2019	Graces Walk	155997
11.8 cm	10 May 2013	Graces Walk	137520
11.7 cm	8 May 2025	Graces Walk	177233
11.5 cm	8 May 2025	Graces Walk	177233
11.5 cm	22 May 1998	Graces Walk	14500
11.4 cm	29 May 2019	Graces Walk	155997
11.2 cm	29 May 2019	Graces Walk	155997
11.1 cm	8 May 2025	Graces Walk	177233
11.1 cm	8 May 2025	Graces Walk	177233
11 cm	22 May 1998	Graces Walk	14500

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

Explore the river

Where stone loach were found

Each point marks a survey location with at least one stone loach 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 stone loach
Boreham Bridge (Sandon Brook)	4 Jun 2001	9 May 2025	2
Graces Walk	15 May 1986	8 May 2025	9
Danbury Road FGS	29 May 2001	29 May 2001	1
Baddow Fruit Farm	26 Apr 1989	21 May 1998	3

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

1986–2025

Survey records by year

Each bar shows how many survey visits recorded stone loach that year.

186

087

088

289

090

091

192

093

094

195

096

097

298

099

000

301

002

003

004

005

006

107

008

009

010

011

012

113

014

015

016

017

018

119

020

021

022

023

024

225

Fish measured by surveyors

Measured length distribution

See how the 100 measured fish were spread across different length ranges.

Smallest: 5.1 cm
Lower quarter: 7.3 cm
Median: 9.2 cm
Upper quarter: 10.2 cm
Largest: 11.9 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Sandon Brook (Main Reaches)

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

Chub European eel Roach Dace Pike Gudgeon

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 →