Bleak · Alburnus alburnus

Bleak in the River Darent

Largest measured bleak: 10 cm

The largest bleak measured in Environment Agency surveys of the River Darent was 10 cm, recorded at Sevenoaks Wildfowl Reserve on 25 May 2021.

Across 4 measured bleak, the median measured length was 8.7 cm.

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

See bleak records across England →

Most recent observation25 May 2021Sevenoaks Wildfowl Reserve · 2 fish

Largest measured bleak: 10 cm
Median length: 8.7 cm
Fish measured: 4
Survey locations: 3

Individual EA measurements

Largest measured bleak

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
10 cm	25 May 2021	Sevenoaks Wildfowl Reserve	160147
8.8 cm	31 Jul 2006	Twitton Brook	103264
8.6 cm	25 May 2021	Sevenoaks Wildfowl Reserve	160147
5.6 cm	15 Sept 2010	Dartford Park	125202

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

Explore the river

Where bleak were found

Each point marks a survey location with at least one bleak 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 bleak
Sevenoaks Wildfowl Reserve	25 May 2021	25 May 2021	1
Dartford Park	15 Sept 2010	15 Sept 2010	1
Twitton Brook	31 Jul 2006	31 Jul 2006	1

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

2006–2021

Survey records by year

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

106

007

008

009

110

011

012

013

014

015

016

017

018

019

020

121

Fish measured by surveyors

Measured length distribution

See how the 4 measured fish were spread across different length ranges.

Smallest: 5.6 cm
Lower quarter: 7.9 cm
Median: 8.7 cm
Upper quarter: 9.1 cm
Largest: 10 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Darent

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

Gudgeon Bullhead Roach Perch Brown / sea trout Stone loach

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 →