TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred System: The particulates removal system also includes an elongated fish raceway solids removal channel (22) for the production of a secondary fish crop that feed on the particulates and solids within primary fish crops production effluent, thus reducing the particulate contamination in the primary fish production effluent. The ammonia removal subsystem also includes an open ditch bioreactor with effluent circulator, suspended biomass support, or aerator. The effluent circulator includes a powered paddlewheel assembly (38). The suspended biomass support includes an extruded plastic pipe. It includes floating polyurethane foam microorganism carrier substrate to cubic or spherical shapes of varying sizes. The aerator includes an air or oxygen injection system, air supply piping, or aeration heads, such that the aeration is uniform throughout the open ditch bioreactor. The wetlands subsystem includes interconnected shallow earthen ponds with locationally-based variably-controllable aeration network. The aeration network includes an aeration supply piping network (52) located in a recessed portions of the floor of the earthen ponds. It has an attached spaced apart aeration head (54) in communication with an air or oxygen injector blower (48) for aerating water within the constructed wetlands subsystem. The wetlands subsystem also includes cultivated climate tolerant plant species that facilitate denitrification of wastewater effluents. Preferred Property: The effluent to be treated within the bioreactor vessel is kept at 0.15-2 ft/sec. The biomass support includes an extruded plastic pipe cut into 0.25-8 inches long. The polyurethane foam media is maintained at 4-60 vol.% to volume of effluent within the bioreactor vessel.    TECHNOLOGY FOCUS - BIOLOGY - Preferred Specie: The secondary crop fish includes detritivorous hardy omnivorous opportunistic fish species. The cultivated climate tolerant plant specie is bulrush plants of genus Scirpus.