| Number seen/Abundance | Date | Location | Comments | Recorded by |
|---|---|---|---|---|
| P | 2003-05-26 | Firestone Bay Firestone Bay, Plymouth, Devon |
Bed of eel grass seen. | John Bleach |
| P | 2003-08-24 | The old pier, Swanage Bay |
Small but dense patches (2 - 3 square metres). | Guy Baker |
| P | 2003-09-27 | Jennycliff Bay, Plymouth Sound |
Several rooted clumps seen just below low water on a 1m tide. | Keith Hiscock |
| P | 2004-04-07 | Jennycliffe Bay Jennycliffe Bay eel grass bed, near Anchorage/Ramscliff Point |
Some denser patches, some sparser. Bed is very patchy, with sand in between patches. MCS Plymouth local group have just surveyed the bed. | Amy Bugg |
| 10 sq m | 2006-09-17 | Gruinard Bay, Wester Ross, Scotland |
Very low tide (spring). Will be snorkelling the area next spring to determine better abundance figures | Kevin Wright |
| Dense patch | 2007-03-21 | Immediately off the Pavilion pier at the entrance to Weymouth harbour. |
Carpet of about 20sq metres only seen at very low tide in about 1 metre of water. Floating strand measured about 80cm in length. Growing in bed of sand and in the shelter of the pier. | Frank Peach |
| >10 square meters | 2009-07-26 | Kildonan, Arran Almost flat sandstone pavement with occasional higher dykes. boulders and sandy lagoons. |
In shallow sandy 'lagoons' at low water | Robin Harvey |
| Beds approx 20m2 | 2009-09-08 | East Head Off the east side of the East Head spit, Chichester Harbour. |
On the intertidal mud banks | Iain Vincent |
| 2009-09-25 | Creak Rythe, Chichester Harbour Intertidal mudflats |
Z. angustifolia (now recognised as Z. marina) present Z. noltii beds | Iain Vincent | |
| Not assessed | 2009-09-21 | Ryde, Isle of Wight Ryde beach (sand) west of the pier |
NA | Iain Vincent |
| c 5 patches 2-3 m across | 2010-09-26 | Gruinard Bay At the northern end in the sheltered water by the small dry island |
Growing abundantly in the sandy areas | Emily Hastings |
| 07/04/2012 | Gorey Flat sandy area |
area on NE side | Kevin McIlwee |