THE EFFICIENCIES OF FLOATING TREATMENT WETLAND ON WATER QUALITY IMPROVEMENT FOR LOACH (MISGURNUS ANGUILLICAUDATUS) CULTIVATION.

Floating treatment wetlands (FTWs) were employed to improve the water quality of aquaculture. Four kinds of FTWs, with different carriers (polyethylene foam board and combined carrier) and different vegetation coverage ratios of water surface (one-third and two-thirds), were designed to monitor the performance on water quality improvement for loach (Misgurnus anguillicaudatus) cultivation. Compared to the FTW with one-third vegetation coverage ratio, two-thirds vegetation coverage ratio FTW performed higher production of vegetation (7.48±0.48 kg m'2), 21.1% higher transparency, and 29.6% lower TN concentration in the cultivation water (O .05).The FTWs with different carriers performed similar removal efficiencies of TN and TP, but 24.0% higher DO concentration was provided by the FTW with combined carrier (P<0.05).As a result, FTW could improve the transparency and TN removal in loach cultivation water, two-thirds vegetation coverage, and combined carrier FTW would be a priority choice in the practice for loach cultivation. [ABSTRACT FROM AUTHOR]