RiverFish

Grayling · Thymallus thymallus

Grayling in the River Monnow

Largest measured grayling: 9.1 cm

The largest grayling measured in Environment Agency surveys of the River Monnow was 9.1 cm, recorded at Clodock on 27 July 2003.

This is the only individual grayling length in the dataset for this river.

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

See grayling records across England →

Most recent observation27 July 2003Clodock · 1 fish
Largest measured grayling
9.1 cm
Length sample
1 fish
Survey records
7
Survey locations
3

Individual EA measurements

Largest measured grayling

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
9.1 cm27 Jul 2003Clodock76899

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 surveyedFirst recordedLast recordedVisits finding grayling
Clodock11 Jul 198927 Jul 20034
W098r20 Jul 19978 Sept 19992
W05522 Aug 199522 Aug 19951

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

1989–2003

Survey records by year

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

Fish measured by surveyors

Recorded length

One individual length was recorded for this fish and river.

Recorded length
9.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Monnow

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

Brown / sea trout Bullhead European eel Stone loach Minnow

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 →