experimental analysis of convergent nozzle of different diameter for DO level improvement with reduced back pressure in aquaculture industry

In Aquaculture industry the Biofloc fish farming technique has got lot of attraction from farmer since past years due to its simplicity and zero or minimal water exchange. The major requirements of the system are to maintain the desired DO level in water and to keep the water in motion in order to provide the floc medium is suspended condition which is generally achieved by proper aeration system. The survey from last four to five years shows that the most of the fish farmers fails in Biofloc technique as the farmers fails to achieve the required condition. Considering the failure of farmers the author proposed a work of performance evaluation of convergent nozzle to enhance do level with improved water circulation in aqua-culture system, in which three different set of nozzles are placed in aeration pipe and the DO level and water movement is observed and the optimum one is selected for improved Biofloc system.