Studies Of The Technology Of Plankton Regulation In Saline-alkaline Pond

Studies of the technology of plankton regulation in Saline-alkaline pond were conducted with land-based experimental enclosures in earthen pond at the Breeding Centre of Chinese mitten crab in Dongying, Shandong, during May 2003 to Oct. 2004. The main contents of the paper includ the structure and dynamics of plankton community in saline-alkaline pond of shrimp, the "top-down" effect of tilapia in shrimp pond, ecological effects of zooplankton refuge on the aquaculture pond of tilapia, the effect of different tilapia biomass on the plankton in the shrimp pond, the impact of different fertilization type on the plankton community in the shrimp pond and the impact of the "fertilizer" on the plankton community in shrimp pond. The main conclusions are as follows:1. The significance and purpose of the studies of regulation of plankton community in saline-alkaline pond: The phytoplankton and zooplankton are not only the natural food of aquacultured animals but also play an important role in the aquaculture water. The structure and dynamics of plankton community varied in different water environment. Whether the"bottom-up"or"top-down"effect of the trophic cascade effect are impact the structure and dynamics of plankton community and the relationships of the impact are complicated. The"biomanipulation"is an effective technique to regulate the aquatic ecological system. Attempts to regulate phytoplankton and zooplankton using filter-feeding fish and different types of fertilization have been done by many researchers and produced inconclusive results. The mathematical model and simulation of plankton community provided an important theoretical method for the regulation of plankton community in the aquaculture pond.