Effect of filter-feeding fish silver carp on phytoplankton species and size distribution in surface water:A field study in water works

作     者：Hua Ma Fuyi Cui Zhiquan Liu Zhenqiang Fan Wenjie He Peijun Yin 

作者机构：State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China Tianjin Waterworks Group Co. Ltd. Tianjin 300040 China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2010年第22卷第2期

页      面：161-167页

核心收录：

学科分类：090801[农学-水产养殖] 090706[农学-园林植物与观赏园艺] 0907[农学-林学] 0908[农学-水产] 08[工学] 09[农学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：supported by the National Natural Science Foundation of China (No.50778048) the National Key Technology R&D Program (No.2006BAJ08B02) 

主　　题：phytoplankton control silver carp Microcystis single-cell micro phytoplankton 

摘      要：Silver carp were introduced into the pre-sedimentation pond to control excessive phytoplankton in raw water. The effectiveness of the filter-feeding silver carp on phytoplankton control and the effect of silver carp on phytoplankton community were investigated. The results showed that Microcystis could be effectively removed by silver carp stocked in the pre-sedimentation pond, and simultaneously, the concentration of single-cell phytoplankton increased obviously. The difference in phytoplankton species and single- cell phytoplankton size between in the water and in the gut of silver carp indicated that phytoplankton smaller than 5 μm, such as Chamydomonas and Platymonas, were almost not be filtered by silver carp, phytoplankton with the size between 5 and 20μm could be partly filtered, and large size phytoplankton, mainly colony-forming Microcystis could be filtered almost completely. These filter- feeding characteristics directly caused the phytoplankton size distribution biased toward miniaturization. Therefore, this biological treatment using silver carp could be applied only to deal with groups of Microcystis-dominated eutrophic water, and was not appropriate in water bodies where single-cell micro phytoplankton were dominant. Especially when silver carp are used in water treatment, a cautious attitude should be taken based on the evaluation of phytoplankton biomass and species structure features in raw water.