Bacterial productivity of shrimp polycultural ecosystems was studied with five experimental enclosures.The results showed that the bacterial production fluctuated from 90 to 909 μgC/L·d,with an average of 292±141 μgC/L·d.The bacterial productivity was stable in the enclosures stocked with a combination of shrimp( Penaeus chinensis ) tilapia( Oreochromis mossambicus O.niloticus ) tagelus( Sinonovacula constricta ),and those of shrimp scallop( Argopecten irradians ),while is was more changeable in...