The effects of nanobubble on the growth environment,such as dissolved oxygen (DO) and total virus-bacteria,and growth performance,such as growth,feed conversion ratio (FCR),survival rate (SR),total harvest,and productivity,were investigated in Penaeus vannamei shrimp ponds.The present study was carried out in 50 m2 indoor raceway ponds for 81 days with stocking density being set to 680 shrimp m-3 in two types of treatment:nanobubble and diffuser aerator.A paddlewheel was used to distribute the oxygen saturation levels throughout the ponds.The presence of nanoparticles was detected using a dynamic light scattering method and was reported to be 82.38 nm in size and-26 mV for zeta potential value.DO was significantly higher under nanobubble treatment.Total virus-bacteria and FCR decreased,whereas SR,growth (weight and length),total harvest,and productivity increased with increasing DO.The SR was reported to reach 95％.The average weight and length of P.vannamei were 15.1 ± 1.8 g and 13.1 ± 1.1 cm,respectively.The total harvest and productivity have doubled to 436 kg and 8.7 kg/m3.The results revealed that nanobubble has managed to maintain DO at the optimal range and affected the shrimp growth significantly (P ＜ 0.05).
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