註釋 Infectious salmon anemia (ISA) was first detected in salmon farms along the mainland shore of southwestern New Brunswick in 1996-1998 and in farms in the adjacent western Deer Island area in late 1998. Farms in both areas have been reinfected in subsequent years and there has been speculation that the virus may have been transmitted through the water between the mainland and Deer Island farms. In an effort to help estimate the potential for water exchange of the ISA virus between farms in these areas, a 3-dimensional tidal water circulation and particle transport model were used. Water exchange scenarios based on the movement of particles during one tidal excursion, as predicted by the model are compared to those estimated by a simple method assuming a 5-km radius circular zone of water exchange around each farm. The effectiveness of removing certain farms in order to create a separation zone between mainland and Deer Island farms was also examined 