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| Effect of stocking density of Procambarus clarkiion plankton community in pond |
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| Abstract: |
| This paper studied the variations of plankton community in ponds, in which Procambarus clarkii and Eriocheir sinensis were stocked in three densities. The results showed that because zooplankton fed on phytoplankton, their
quantities were in negative correlation in the most ponds. With the increasing of density, the biomass of phytoplankton
increased and the forms of Euglenophyta, Cyanophyta, Pyrrophyta instead of Bacillariophyta and Chlorophyta became
dominant group in the high density groups, but zooplankton爷s biomass decreased, supported by Protozoa, Rotife and
Nauplius. The biomass ratio of zooplankton/phytoplankton showed significant negative correlation with stocking density of
shrimp and crab. The results of this study indicated that the medium stocking density was optimum so as to give
consideration to the ecological benefit and economic benefit. |
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