Floating Bed Cultivation of Houttuynia cordata Affecting Contaminants of GIFT Tilapia Aquaculture Pond

doi:10.11924/j.issn.1000-6850.casb16110134

Abstract

Abstract: To study the purification effect ofHouttuynia cordata cultivated on floating bed (0, 5% planting area) on water quality of intensive aquaculture ponds of GIFT tilapia, contents of the main water quality indexes including organic carbo (TOC), chemical oxygen demand (COD), chlorophyll (Chl), total nitrogen (TN), ammonium nitrogen (NH4+-N), nitrite nitrogen (NO2--N), nitrate nitrogen (NO3--N), total phosphorus (TP) and PO43--P were measured. In addition, contents of TOC, TN and TP in sediment were also measured. The results showed that contents of TOC, TN, NH4+-N both in the open water and floating bed area decreased significantly after floating bed cultivation ofH. cordata , content of Chl decreased significantly in the open water in May. Contents of COD, Chl, TP and PO43--P significantly decreased in floating bed area and open water, and content of NO3--N significantly decreased in the floating bed area in June. In July, contents of COD, Chl, TN, TP decreased significantly both in the floating bed area and open water, and content of TOC decreased significantly in the floating bed area. In August, contents of TN, TP decreased significantly both in the floating bed area and open water, contents of TOC and COD in the floating bed area, content of Chl in the open water decreased significantly. In September, content of TOC decreased significantly in the floating bed area and open water, content of Chl in the floating bed area, and contents of COD, TN, NH4+-N and NO3--N in the open water decreased significantly. In October, contents of COD, Chl, TP decreased significantly both in the floating bed area and open water, content of NH4+-N in the floating bed area and content of TN in the open water decreased significantly. In June, contents of TOC, TN, TP in the sediment with floating bed decreased significantly; in July and September, content of TN decreased significantly. In conclusion, contents of COD, TN and TP in the water and contents of TOC, TN and TP in sediment significantly reduced in the tilapia ponds after floating bed cultivation ofH. cordata . The total yield and survival rate of GIFT tilapia significantly increased, and the feed coefficient rate and biological indexes reduced.

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References

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