Direct individual measurements
Largest zander 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 | Relief ChannelAnglian | 87.8 cm (34.6 in) | 12.3 cm (4.8 in) | 3,959 | 10 Sept 1993Holme Farm Magdalen |
| 2 | Middle Level Main DrainAnglian | 80.8 cm (31.8 in) | 8.3 cm (3.3 in) | 436 | 22 Sept 1994Peter's Drove Bridge |
| 3 | Kings DykeAnglian | 78.3 cm (30.8 in) | 15.8 cm (6.2 in) | 147 | 21 May 1999Horsey Toll |
| 4 | River Ely OuseAnglian | 77.8 cm (30.6 in) | 13.5 cm (5.3 in) | 621 | 3 Aug 1993Queen Adelaide |
| 5 | River DelphAnglian | 77 cm (30.3 in) | 17.8 cm (7 in) | 73 | 2 Jun 2003Welmore Lake Sluice |
| 6 | Sixteen Foot DrainAnglian | 76.8 cm (30.2 in) | 19.8 cm (7.8 in) | 136 | 9 Aug 1994Riverside Lodge |
| 7 | River SevernMidlands | 76.2 cm (30 in) | 51.4 cm (20.2 in) | 66 | 4 May 2016Upton Marina Basin EQSD |
| 8 | Sedge Fen DrainAnglian | 76 cm (29.9 in) | 73.5 cm (28.9 in) | 3 | 17 Mar 2004Sedge Fen Drain Pumping Station |
| 9 | River MedwaySouth East | 75 cm (29.5 in) | 17.8 cm (7 in) | 11 | 8 Sept 2022D/s Weirwood Reservoir |
| 10 | Cut-Off ChannelAnglian | 74.5 cm (29.3 in) | 16.8 cm (6.6 in) | 257 | 13 Jul 1990Crossways Farm |
Equal maximum lengths are ordered by sample size. Measurements are shown as recorded and are not converted into estimated weights.
8,075 fish measured
Measured zander lengths
The median divides the measured sample in half. This distribution describes surveyed fish, not every zander 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 zander observations
The ten most recent survey visits that recorded zander in named waterways.
| Date | River or waterway | Survey location | Fish recorded |
|---|---|---|---|
| 18 Jun 2026 | River Medway | Yalding Leas | 2 |
| 14 May 2026 | Well Creek | Salters Lode | 1 |
| 9 Sept 2025 | River Medway | D/s Weirwood Reservoir | 1 |
| 9 Jul 2025 | River Thames | Iffley - Sandford (Margin) | 1 |
| 11 Jun 2025 | River Cherwell | Shipton-on-Cherwell (Margin) | 1 |
| 22 Apr 2025 | River Severn | Upton Marina Basin EQSD | 4 |
| 24 Oct 2024 | River Ouse | Ouse Angling records | 1 |
| 10 Jul 2024 | River Thames | Sandford Weir stream | 1 |
| 9 Jul 2024 | River Thames | Iffley - Sandford (Margin) | 1 |
| 10 Oct 2023 | River Ely Ouse | Little Thetford | 15 |
A survey record confirms zander at that place and time. It does not show present-day abundance or fishing access.
726 positive survey visits
Survey distribution
EA surveys recorded zander at 250 locations across 56 named waterways represented on RiverFish.
| Region | Waterways | Locations | Survey visits | Latest record |
|---|---|---|---|---|
| Anglian | 40 | 191 | 629 | 14 May 2026 |
| South East | 8 | 18 | 29 | 18 Jun 2026 |
| Midlands | 7 | 40 | 67 | 22 Apr 2025 |
| Yorkshire and North East | 1 | 1 | 1 | 24 Oct 2024 |
29 detailed pages
Zander by river
Open any river-specific page for its measured lengths, largest surveyed individuals, locations and observation history.
Anglian 23 pages
Midlands 4 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 zander.
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 →