Biological control experiment of excess propagation of Cyclops for drinking water security.
Cyclops of zooplankton propagated excessively in eutrophic water body and could not be effectively inactivated by the conventional disinfections process like chlorination due to its stronger resistance to oxidation. In this study, an ecological project was put forward for the excess propagation control of Cyclops by stocking the filter-feeding fishes such as silver carp and bighead carp under the condition of no extraneous nutrient feeding. The results of experiments with different stocking biomass showed that the propagation of Cyclops could be controlled effectively, and the water quality was improved simultaneously by impacting on nutriment level and plankton community structure at proper stocking density of 30 g/m3 of water. The growth of Cyclops may not be effectually controlled with lower biomass of fish (10 g), and the natural food chain relation may be destroyed for Cyclops dying out in water while the intense stocking of 120 g per cubic meter of water. In addition, the high predator pressure may accelerate supplemental rate of nutrients from bottom sediments to water body to add the content of total nitrogen and phosphorus in water.
Lin
Tao
T
College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China. hit_lintao@sina.com
Cui
Fu-Yi
FY
Liu
Dong-Mei
DM
D000818:Animals; D002347:Carps / Q000502:physiology*; D056890:Eukaryota / Q000254:growth & development; D020387:Food Chain; D009584:Nitrogen / Q000032:analysis; D010572:Pest Control, Biological; D010758:Phosphorus / Q000032:analysis; D011156:Population Density; D014873:Water Pollutants / Q000032:analysis; D018508:Water Purification / Q000379:methods*; D015048:Zooplankton
D014873:Water Pollutants; D010758:Phosphorus; D009584:Nitrogen