Abstract: The deterioration of micro-ecological environment induced by intensive culture has been thought to be the main reasons of the problems in non-point source pollution, aquatic product security, and fish diseases in freshwater aquaculture pond. From the three aspects of micro-ecological environment (plankton community, bacterial community, and abiotic environment), this paper reviewed the research progress and existing problems in the water quality control technologies of freshwater aquaculture ponds. There were two prominent issues, i.e., 1) the lack of effective control measures in the absence of phytoplankton downward pressure control makes the regulation of plankton community exist short board, and 2) it still could not make precise regulation on the bacterial community due to the lack of defining characteristic bacterial flora in healthy pond ecosystem and the limitation of related technologies. The three aspects of the micro-ecological environment in freshwater aquaculture pond were interrelated and interacted. Though the regulation of abiotic environment was the key element, the other two elements were also the controlling targets. It was suggested that a systematic control should be carried out on the intensively managed freshwater aquaculture pond.

Key words: Fukushima nuclear accident, high seas in North Pacific Ocean, radioactive nuclide, monitoring., marine organism,