To answer your question Bill, if the atlantic roe is infected - and there is a high chance that it is - then it is possible for the virus to remain dormant in the roe and be spread to wild river. However, many factors would act against the virus from the point it was harvested to the point that it is used - i.e., frozen and thawed multiple times, microwaved, etc. - which would reduce the chance of transmitting the live virus from the farms to the wild river.
However, the fish you are catching likely already have the virus or something else, as they would have likely swam by multiple fish farms at least twice - during outmigration, and upon their return.