| Number seen/Abundance | Date | Location | Comments | Species |
|---|---|---|---|---|
| 20 | 2009-08-13 | Lough Swilly, Co. Donegal, Eire Fahan Marina, Lough Swilly, and in Lough Swilly crossing the Inch Flats towards Rathmullan. Multiple sightings of Compass Jellyfish |
Free moving in marina and in open water, at or near surface in tidal waters with depths from one metre to 20 metres. Tide was flowing out at the time. | Chrysaora hysoscella |