Stone loach · Barbatula barbatula

Stone loach in the Lee Navigation

Largest measured stone loach: 9.7 cm

The largest stone loach measured in Environment Agency surveys of the Lee Navigation was 9.7 cm, recorded at Ware Priory on 7 October 2004.

Across 10 measured stone loach, the median measured length was 8.2 cm.

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

See stone loach records across England →

Most recent observation8 July 2025Hertford Basin

Largest measured stone loach: 9.7 cm
Median length: 8.2 cm
Fish measured: 10
Survey locations: 3

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
9.7 cm	7 Oct 2004	Ware Priory	82728
9.5 cm	10 Oct 2002	Ware Priory	72657
9.3 cm	30 Aug 2005	Ware Priory	86576
8.8 cm	7 Oct 2004	Ware Priory	82728
8.2 cm	7 Oct 2004	Ware Priory	82728
8.1 cm	7 Oct 2004	Ware Priory	82728
7.8 cm	7 Oct 2004	Ware Priory	82728
6.4 cm	7 Oct 2004	Ware Priory	82728
6.3 cm	7 Oct 2004	Ware Priory	82728
5.6 cm	30 Aug 2005	Ware Priory	86576

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
Hertford Basin	8 Jul 2025	8 Jul 2025	1
Ponders End	29 Nov 1978	29 Aug 2023	2
Ware Priory	10 Oct 2002	30 Aug 2005	4

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

1978–2025

Survey records by year

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

178

079

080

081

082

083

084

085

086

087

088

089

090

091

092

093

094

095

096

097

098

099

000

001

102

103

104

105

006

007

008

009

010

011

012

013

014

015

016

017

018

019

020

021

022

123

024

125

Fish measured by surveyors

Measured length distribution

See how the 10 measured fish were spread across different length ranges.

Smallest: 5.6 cm
Lower quarter: 6.8 cm
Median: 8.2 cm
Upper quarter: 9.2 cm
Largest: 9.7 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Lee Navigation

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

Roach Perch Pike Chub Bleak Tench

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 →