2Hall P O J, Holly O, Kollberg S, et al. Chemical fluxes and mass bal- ances in a marine fish cage farm IV nitrogen [ J ]. Marine Ecology Progress Series, 1992,89:81 - 91.
5Ridha M T,Cruz E M. Effect of biofiher media on water quality and biological performance of the Nile tilapia ( Orelchromis niloticus L. ) reared in a simple recirculating system[ J]. Aquacultural Engineer- ing,2001,24 : 157 - 166.