Direct individual measurements
Largest thick lipped grey mullet by waterway
Ranked by the largest individual measured in EA surveys. The sample size shows how many valid length measurements underpin each waterway's figures.
| Rank | River or waterway | Largest | Median | Measured | Measured at |
|---|---|---|---|---|---|
| 1 | River Great StourSouth East | 52.4 cm (20.6 in) | 52.4 cm (20.6 in) | 3 | 30 Sept 2009Plucks Gutter |
| 2 | River RodingSouth East | 46.5 cm (18.3 in) | 3.3 cm (1.3 in) | 5 | 30 Jul 1993Barking Creek - Mayes Brook confluence |
| 3 | River StourAnglian | 20.5 cm (8.1 in) | 19.3 cm (7.6 in) | 3 | 24 Aug 1983Dedham (Old) River |
| 4 | Asheldham BrookAnglian | 13.2 cm (5.2 in) | 11.7 cm (4.6 in) | 7 | 16 Feb 1999Bovills Marsh |
| 5 | River WantsumSouth East | 9.2 cm (3.6 in) | 9.2 cm (3.6 in) | 1 | 27 Jul 2004Reculver Sluice |
| 6 | River South Efford MarshSouth West | 5.5 cm (2.2 in) | 4.5 cm (1.8 in) | 23 | 1 Mar 2011Downstream Bridge Pipe** |
| 7 | Holland Brook (Main Reaches)Anglian | 3.3 cm (1.3 in) | 3.3 cm (1.3 in) | 1 | 25 Nov 1999Sladburys |
| 8 | Pickers DitchAnglian | 3 cm (1.2 in) | 3 cm (1.2 in) | 7 | 23 Nov 1999Pickers Ditch Site |
| 9 | Dunwich RiverAnglian | 2.9 cm (1.1 in) | 2.9 cm (1.1 in) | 1 | 14 Jan 2013Bridge Farm |
| 10 | River HolbrookAnglian | 2.1 cm (0.8 in) | 2.1 cm (0.8 in) | 3 | 10 Dec 1999Holbrook Sluice |
Equal maximum lengths are ordered by sample size. Measurements are shown as recorded and are not converted into estimated weights.
54 fish measured
Measured thick lipped grey mullet lengths
The median divides the measured sample in half. This distribution describes surveyed fish, not every thick lipped grey mullet living in England.
Only positive individual lengths that pass RiverFish's general measurement checks are included. Each bar covers a 20 mm range.
Latest EA evidence
Latest thick lipped grey mullet observations
The ten most recent survey visits that recorded thick lipped grey mullet in named waterways.
| Date | River or waterway | Survey location | Fish recorded |
|---|---|---|---|
| 14 Jan 2013 | Dunwich River | Bridge Farm | 1 |
| 1 Mar 2011 | River South Efford Marsh | Downstream Bridge Pipe** | 23 |
| 30 Sept 2009 | River Great Stour | Plucks Gutter | 3 |
| 27 Jul 2004 | River Wantsum | Reculver Sluice | 1 |
| 9 Sept 2002 | River Brit | Palmers Brewery | Not supplied |
| 10 Dec 1999 | River Holbrook | Holbrook Sluice | 3 |
| 25 Nov 1999 | Holland Brook (Main Reaches) | Sladburys | 1 |
| 23 Nov 1999 | Pickers Ditch | Pickers Ditch Site | 7 |
| 16 Feb 1999 | Asheldham Brook | Bovills Marsh | 3 |
| 16 Feb 1999 | Asheldham Brook | Brook Farm | 2 |
A survey record confirms thick lipped grey mullet at that place and time. It does not show present-day abundance or fishing access.
14 positive survey visits
Survey distribution
EA surveys recorded thick lipped grey mullet at 13 locations across 11 named waterways represented on RiverFish.
| Region | Waterways | Locations | Survey visits | Latest record |
|---|---|---|---|---|
| Anglian | 6 | 8 | 9 | 14 Jan 2013 |
| South East | 3 | 3 | 3 | 30 Sept 2009 |
| South West | 2 | 2 | 2 | 1 Mar 2011 |
1 detailed pages
Thick lipped grey mullet by river
Open any river-specific page for its measured lengths, largest surveyed individuals, locations and observation history.
Anglian 1 pages
How to read this page
Survey measurements, not angling records
Environment Agency surveys are designed to monitor fish populations. Their largest measurement is not equivalent to a verified rod-and-line record, and the survey sample does not include every river or every thick lipped grey mullet.
Waterway groups with administrative or mixed-river labels are excluded from the headline national totals and rankings. Their eligible river-specific pages remain available in the directory so no published destination is hidden.
The fish records use the Environment Agency source snapshot dated 10 August 2026.
How RiverFish handles the data →