Summary Ostreid herpesvirus type 1 ( OsHV ‐1) has become a problematic infective agent for the P acific oyster C rassostrea gigas . In particular, the OsHV ‐1 μVar subtype has been associated with severe mortality episodes in oyster spat and juvenile oysters in F rance and other regions of the world. Factors enhancing the infectivity of the virus and its interactions with susceptible and resistant bivalve hosts are still to be...

The Antarctic silverfish Pleuragramma antarcticum (Nototheniidae) is the most abundant pelagic fish inhabiting Antarctic waters. In this study we investigated, through partial sequencing of the D‐loop mitochondrial region, samples collected at four different locations in the Southern Ocean, three in the Atlantic and one in the Pacific sector. Sampling was replicated in two different years at two locations. Sequence analysis sh...