Comparative susceptibility of three species of char and of rainbow trout × char triploid hybrids to several pathogenic salmonid viruses

Abstract

Triploid hybrids were obtained from rainbow trout Oncorhynchus mykiss females crossed with brook trout Salvelinus fontinalis, arctic char S. alpinus and lake trout S. namaycush, and challenged with infectious pancreatic necrosis virus (IPNV) type Sp, viral haemorrhagic septicaemia virus (VHSV) types 1 and 3, and infectious haematopoietic necrosis virus (IHNV). Rainbow trout × coho salmon (O. kisutch) triploid hybrids were included in certain trials. Brook trout were resistant to VHSV, and brook trout × rainbow trout hybrids were resistant both VHSV and IHNV, but susceptible to IPNV. Arctic char were susceptible to IPNV and resistant to VHSV. The hybrids were susceptible to IPNV, but partially resistant to VHSV. Lake trout were partially resistant to IPNV, but their hybrids with rainbow trout were susceptible. -from Authors