Comparative evaluation of insitu and exsitu feeding of aerobic microbial floc in the nursery culture of Pacific White Shrimp,Penaeus vannamei
This study evaluated the effect of aerobic microbial floc technology (AMF) application on immune response water quality and production performance of Penaeus vannamei at insitu and exsitu raceways. The shrimp seeds of ±0.001gm at a density of 1300PL/m3 in Control (without external carbon input) and AMF treatments.. Distillery spentwash was added on AMF treatments as the organic carbon source at a C/N ratio of 15:1. Control treatments of each density tested showed more fluctuated water quality parameters throughout the experimental period. The highest TAN and nitrite-nitrogen were observed in control treatment of 3.64 mg TAN/L ,3.84 mg TAN/L and 8.79 mg NO2-N/L and 9.32 mg NO2-N/L , respectively. The highest total yield was observed in control treatment, whereas the highest survival and NBT activity was observed in AMF treatments of which insitu treatment of vannamei was relatively higher. Total feed used in AMF was lower than that of control treatments (P < 0.05) ,however there was a significant difference between insitu and exsitu systems suggesting that AMF could be maintained and fed easily in insitu treatment than exsitu.