There are many strains of the Viral Hemorrhagic Septicemia virus, however none of them seem to differ in the symptoms the cause fish. The only known effect of the changes in the genome of the virus is simply that it infects of fish types. Here is a list of strains and the types of fish that they infect:

I-a: Rainbow Trout and other freshwater fish
I-b: Marine fish
I-c: Rainbow Trout
I-d: Rainbow Trout
I-e: Rainbow Trout
II: Marine fish
III: Marine fish, Greenland Halibut, Turbot
IV-a: Marine fish
IV-b: Freshwater Fish

Being a virus, VHS does not adapt to it's environment in other ways, such as through movement or a change in structure unrelated to the composition of the genome.

Viruses have adapted other ways of introducing their segments of nucleotides, such as changing the code from DNA to RNA, double stranded to single stranded, and positive-sense to negative-sense. This just indicates where the nucleotides need to be placed within the cell in order for the cell to start making the correct proteins.

Back to Distribution                                Home                                        On to Prevention