Large jellyfish blooms have been recorded in the Adriatic Sea several times in the past. Different hypotheses have been proposed, such as relationships with eutrophication, anoxia, climatic factors and over-exploitation of pelagic fish, but no definitive conclusions regarding possible causes for their massive presence were widely accepted. Aggregations of large jellyfish in the northern Adriatic have significant impact on tourism and the artisanal fishery of Slovenia. There is a long tradition of jellyfish research at the institutions around the Adriatic. Nowadays, the scientific interest is also focused on the genetic diversity within and at species level.

Video report of jellyfish observation on 27^th February 2008 on more underwater locations in the Gulf of Trieste.

Video by: Tihomir Makovec ,
Mounted and prepared by: Janez Forte.