Abstract

This study was conducted to test the effect of bioremediation the polychaete worm Nereis diversicolor in order to removal of wastewater nutrition derived different densities Huso huso. The aim of this study was determination of different densities for creating the equivalence for rearing of N. diversicolor and H. huso rate in the integrated culture system. Three different densities of H. huso culture with N. diversicolor fed with fish feed waste were considered at water temperature 23^°C for 8 weeks. The obtained results demonstrated that N. diversicolor could grow via feeding with the fish waste water. The pure production and survival rate of harvested Nereis in NWF₂ treatment was significantly higher than other treatments (P<0.05). The highest removal efficiency of waste water including NO₂-N (91%), TSS (89%),  BOD₅ (85%),  PO₄-P (65%), total phosphorus (63%), total nitrogen (56%), NH₃-N (35%)_, were seen in different treatments. The removal efficiency of waste water nutrition was decreased without use of N. diversicolor. Also, removal efficiency of NO₃-N did not occur with presence of the worm. The obtained results demonstrated that increasing of worm growth, decreasing waste water nutrition and achieving of secondary production made system efficiency. The use of worm biomass as a waste treatment method could economically play important role.