Grayling · Thymallus thymallus

Grayling in the River Blackwater

Largest measured grayling: 32 cm

The largest grayling measured in Environment Agency surveys of the River Blackwater was 32 cm, recorded at Hammonds Farm on 6 September 2004.

Across 24 measured grayling, the median measured length was 21.1 cm.

Surveyors recorded weights for 10 grayling. The median was 3 oz (0.085 kg) and the largest recorded weight was 10.7 oz (0.302 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 Blackwater.

See grayling records across England →

Most recent observation15 September 2022Broadlands Fishery · 5 fish

Largest measured grayling: 32 cm
Median length: 21.1 cm
Fish measured: 24
Survey locations: 4

Individual EA measurements

Largest measured grayling

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
32 cm	6 Sept 2004	Hammonds Farm	82129
28.6 cm	6 Sept 2004	Hammonds Farm	82129
28.5 cm	3 Sept 2018	Broadlands Fishery	153662
27.7 cm	6 Sept 2004	Hammonds Farm	82129
25.6 cm	3 Sept 2018	Broadlands Fishery	153662
25.5 cm	15 Sept 2022	Broadlands Fishery	161536
24.5 cm	15 Sept 2022	Broadlands Fishery	161536
22.8 cm	6 Sept 2004	Hammonds Farm	82129
22.5 cm	20 Sept 2011	Upper Whinwhistle	128011
22.2 cm	28 Jul 2011	Lower Whinwhistle	127236

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

Explore the river

Where grayling were found

Each point marks a survey location with at least one grayling 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 grayling
Broadlands Fishery	20 Sept 2011	15 Sept 2022	3
Upper Whinwhistle	20 Sept 2011	20 Sept 2011	1
Lower Whinwhistle	28 Jul 2011	28 Jul 2011	1
Hammonds Farm	6 Sept 2004	6 Sept 2004	1

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

2004–2022

Survey records by year

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

104

005

006

007

008

009

010

311

012

013

014

015

016

017

118

019

020

021

122

Fish measured by surveyors

Measured length distribution

See how the 24 measured fish were spread across different length ranges.

Smallest: 8.3 cm
Lower quarter: 19.6 cm
Median: 21.2 cm
Upper quarter: 24.8 cm
Largest: 32 cm

0–99 mm

100–199 mm

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

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

Lightest: 0.7 oz (0.02 kg)
Lower quarter: 2.7 oz (0.0765 kg)
Median: 3 oz (0.085 kg)
Upper quarter: 5.8 oz (0.1642 kg)
Heaviest: 10.7 oz (0.302 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 Blackwater

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

Roach Bullhead European eel Dace 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 →