Effects of environmental factors,such as overlying water types,microorganism activities,temperature,pH and hydrodynamic conditions upon release of phosphorus in fish bait were experimentally investigated.The results showed that: the contents of total phosphorus and orthophosphate released from bait in deionized water were about 1.58 and 1.76 times respectively equal to those in water of Panjiakou Reservoir.The action of microorganism was in favor of releasing phosphorus in fish bait,and the contents of tota...