The jellyfish research group of the ICM-CSIC, strongly believe, that creation and development of mitigation tools and spreading knowledge about the jellyfish proliferation phenomenon is the best way to reduce its impact in coastal and beach areas.  These tools should be based in communication and information exchange between society and scientists, allowing general public to a wide access of verified data.  The App iMEDJELLY is one of these tools, which was developed and launched in 2012 and after 6 years of activity, it has shown to be an effective tool and nicely welcome among society, besides offering a support to lifeguards work at the beach and coastal municipalities. 
 
The iMEDJELLY project is based in more than 10-years collaboration between the ICM-CSIC and the coastal municipalities of Catalonia, that through their Rescue Services had established a jellyfish observation network through all the catalan coast. One of the main objectives was to consolidate the way of gathering daily and real time information about presence and/or absence of jellyfish in the beaches. Volunteers that collect and send daily information, mainly lifeguards, are trained and receive identification material facilitating work development and guaranteeing a correct data collection. Experts then validate this information in order to deliver verified information to society. 
 
The information provided by the iMEDJELLY App is currently bounded to the Catalan coast. This fact is due to two reasons. The first one, is that the entities and administrations in the field of Catalonia have always supported the public service provided, and the second one, is the long collaboration established that covers more than 20 years of monitoring the situation on the Catalan coast, allowing training and knowledge transfer to the people who report from the beaches and a group of volunteers who are increasingly numerous and knowledgeable about the subject. The will of the team that develops this project has always been to cover as much of the coastal area of the Spanish coast as possible. This fact depends on the will or interest of the different administrations or entities of each area. In any case, the protocols, suggestions and information about jellyfish species that can be consulted in the application are valid for the entire Spanish coast, since they are the same species.
 
The iMEDJELLY App is the first application worldwide that provides a daily report of the presence of jellyfish in real time with verified data by experts through a collaborative citizen science approach, with volunteer personnel trained to facilitate the recognition of species. In addition, the iMEDJELLY App provides updated scientific information on each of the jellyfish species that can be found on the Catalan coast and in the rest of the Mediterranean basin, in addition to specific first aid protocols  against jellyfish stings. The latest version of the App also invites citizens to be part of this observation network and contribute to the best functioning of the application.
 
After these years of work, the results show that this type of tools are very well received by society as a way to deliver useful tools in front of a complex topic, such as jellyfish presence in coastal areas, and volunteers participation being by public information feedback on jellyfish awareness.