| Number seen/Abundance | Date | Location | Comments | Species |
|---|---|---|---|---|
| P | 2003-05-25 | On strand line along the beach with a strong smell of ammonia coming from them. Some were completely |
Thousands seen on strandline in many different sizes. | Velella velella |
| P | 2003-05-24 | Perranuthnoe Beach Perranuthnoe Beach, all along beach |
seen on beach, detached | Sargassum muticum |
| Large numbers | 2003-06-04 | Between Marazion and Penzance On strandline at Long Rock Beach |
Along strandline. Fresh. | Velella velella |