Differenty approches to discover mycovirus associated to marine organism

Here we describe the protocols to characterize the virome associated to fungi isolated from marine organ-isms assessed on the seagrass Posidonia occanica and on the marine animal Holothuria poli. We provide detailed protocols for fungal isolation, fungal growth, and total RNA extraction. Ribosomal RNA deple-tion, cDNA library synthesis and normalization, and sequencing runs on different platforms are part of the protocols that are generally outsourced and therefore are not described in this chapter. We describe, instead, how raw reads are assembled into contigs and how to search for putative viral sequences. Furthermore, we detail qualitative checks to infer the existence of the virus as a replicative biological entity.