2Intelligence Research Institute. Chinese Academy of fishery sciences fishery survey of abroad [ M]. Beijing: Science Press, 1991:100- 101.
3Bovendeur J , Eding E H , Henken A M. Design and performance of water recirculation systems for high density culture of the merica catfish [ J] . Aquaculture , 1987,63:329 - 353.
4Heinsbroek L T N, Kamstra A. Design and performance of water recirculation systems for eel culture [J]. Aquacuhural Engineering, 1990(9) : 171 - 207.