Ancestry.com. Ischia, Napoli, Italy, Comune Civil Registration Records, 1809-1929 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014.Original data: Italy, Napoli, Ischia, Civil Registration (Comune), 1809-1929. Salt Lake City, Utah: FamilySearch, 2013.
This database includes civil registration records of births, marriages and deaths held in the town of Ischia. These registration records also include military conscription lists.
You can learn more about this collection at the FamilySearch website.