WIONIS is an information exchange network for anyone interested in any aspect of invasive species and their management in the Western Indian Ocean (WIO) region. The objective of WIONIS is to promote the effective prevention and management of biological invasions in the WIO region. WIONIS does this by facilitating the exchange of data, news, alerts, advice, requests and other information, by promoting collaboration, and by establishing links between those in need of a resource (information, expertise, technical assistance, training, funding, staff, volunteers...) and those who can provide it.