system) and then a centralized system containing micro-screen
filtration, biological (fluidized sand) filtration, carbon dioxide
stripping, supplemental low head oxygenation, ozonation, and
ultraviolet sterilization (only in the parr and smolt systems) to
treat the entire recirculating flow before it is returned to the
culture tanks (Figs. 3–5). A process flow drawing for one of 3rd year
broodstock systems is provided (Fig. 5); it is representative of the
process flow paths used in the other systems. Dual-drain circular