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Top-down Effect Control of Fish Experiment for Excess Propagation of Cyclops


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Top-down Effect Control of Fish Experiment for Excess Propagation of Cyclops
LIN Tao12CUI Fu-yi2CHEN Wei1LIU Dong-mei2
1.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,Hohai University,Nanjing 210098,China;2.School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China
filter-feeding fishes Cyclops zooplankton top-down effect biomanipulation
This paper investigates the control of the excess propagation of Cyclops by the top-down effect of fish,such as silver carp and bighead carp under different stocking biomass conditions.The biomass between silver carp and bighead carp is in a ratio of 7∶3 during the experiment.The experimental results show that the propagation of Cyclops can be controlled effectively at proper fish stocking density of 30 g per cubic meter of water.The phosphorus in fish organism and depositional substance increases 45% and 16% respectively in the ecosystem of 30 g fish biomass,which is helpful to decrease the recycle speed of sedimentary nutriment.The top-down effect of fish is weakened not to effectually control the growth of Cyclops with lower biomass of fish(10 g/m3),and the concentration of granular phosphorus increases 60%.The high predator pressure accelerates supplemental rate of nutrients from bottom sediments and increases the content of total phosphorus by 23% at the intense stocking of 120 g per cubic meter of water.


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Last Update: 2012-12-19