Utilization the Aquatic Plants as a Filtration Media in A Closed Bio-Aquatic System to Improve Water Quality and Common carp Growth Performance

The experiment was conducted in the animal production field, College of Agriculture, Tikrit University, for period from 14/6/2022 to 14/8/2022 inside a semi-exposed building with three treatments. Each treatment included replicates, and each replicate (6) fish closed bio-aquatic system, by weight 13.75±1.09, filtration tank representing mechanical biological filter an intensive aquatic system capacity 100 liters each, two plants were grown Water thyme (Hydrilla Verticillata), Torpedo grass (Panicum Repens), except control treatment, which similar all treatments presence plants. water treated unit through sponge layer, then directing means crushed gravel, addition dissolved organic pollutants. results showed significant effect at (p ≤0.05) on pH, Cloredait (Cl) nitrate (NO3,) nitrite (NO2), ammonia. properties reflect organisms. There improvement gain (G.W), specific growth rate (SGR), feed conversion efficiency (FCR) T2 T3 compared treatment. While, result correlation or interactions between characteristics parameters Common carp effects (P ≤0.01) level.