Fishery Internet of Vessels (FIoV) is the specific application of Internet of things(IOT) technology in marine fisheries. Its construction is a huge systematic project, and its application scenarios are diverse. At the beginning of the system construction, in consideration with the different needs of future application scenarios, and the development status and trend of key technology, the specific indexes and implementation stages of the system were determined so as to avoid going backwards. In this paper, the concept, characteristics and significance of construction of FIoV were given; the future application scenarios of FIoV in fisheries production, fishery supervision, marine scientific research and fishery multimedia, etc. and the roles of FIoV in these scenarios are analyzed in detail; the requirements for key technologies of FioV in different application scenarios, such as information collection and processing, communication, data storage and processing, information security are expounded; finally, combined with the technical difficulty and urgency of the application scenarios, the future development stages of FIoV are given. This article lays a foundation for the key technology research and system design of FIoV.